Episodic Post-Shock Dust Formation in the Colliding Winds of Eta Carinae (2009)
Eta Carinae shows broad peaks in near-infrared (IR) JHKL photometry, roughly correlated with times of periastron passage in the eccentric binary system. After correcting for secular changes...
Smith, Nathan, Miller, Adam A., Li, Weidong, Filippenko, Alexei V., Silverman, Jeffrey M., Howard, Andrew W., ...
We present progenitor star detections, light curves, and spectra of SN 2009ip and the 2009 optical transient in UGC 2773 (U2773-OT), which were not genuine supernovae (SNe). In particular, precursor...
Smith, Nathan, Whitney, Barbara A., Conti, Peter S., De Pree, Chris G., Jackson, James M.
We present high spatial resolution mid-IR images of the ring of UCHII regions in W49A obtained at Gemini North, allowing us to identify the driving source of its powerful H2O maser outflow. These...
Spectral Evolution of the Extraordinary Type IIn Supernova 2006gy (2009)
Smith, Nathan, Chornock, Ryan, Silverman, Jeffrey M., Filippenko, Alexei V., Foley, Ryan J.
We present a detailed analysis of the extremely luminous Type IIn supernova SN2006gy using spectra obtained between days 36 and 237 after explosion. We derive the temporal evolution of the effective...
The ``Homunculus'' nebula around Eta Carinae is one of our most valuable tools for understanding the extreme nature of episodic pre-supernova mass loss in the most massive stars, perhaps even more...
The Magellanic Clouds Survey: a Bridge to Nearby Galaxies (2009)
Scowen, Paul A., Jansen, Rolf, Beasley, Matthew, Calzetti, Daniela, Fullerton, Alex, Gallagher, John, ...
We outline to the community the value of a Magellanic Clouds Survey that consists of three components: I) a complete-area, high resolution, multi-band UV-near-IR broadband survey; II) a narrowband...
The Star Formation Camera (2009)
Scowen, Paul A., Jansen, Rolf, Beasley, Matthew, Calzetti, Daniela, Desch, Steven, Fullerton, Alex, ...
The Star Formation Camera (SFC) is a wide-field (~15'x19, >280 arcmin^2), high-resolution (18x18 mas pixels) UV/optical dichroic camera designed for the Theia 4-m space-borne space telescope concept....
Understanding Global Galactic Star Formation (2009)
Scowen, Paul A., Jansen, Rolf, Beasley, Matthew, Calzetti, Daniela, Desch, Steven, Gallagher, John, ...
We propose to the community a comprehensive UV/optical/NIR imaging survey of Galactic star formation regions to probe all aspects of the star formation process. The primary goal of such a study is to...
Scowen, Paul A., Jansen, Rolf, Beasley, Matthew, Desch, Steve, Fullerton, Alex, McCaughrean, Mark, ...
The last two decades have seen remarkable progress in our long-standing goal of determining the abundance and diversity of worlds in the Galaxy. Understanding of this subject involves tracing the...
The Impact of the Astro2010 Recommendations on Variable Star Science (2009)
Walkowicz, Lucianne M., Becker, Andrew C., Anderson, Scott F., Bloom, Joshua S., Georgiev, Leonid, Grindlay, Josh, ...
The next decade of survey astronomy has the potential to transform our knowledge of variable stars. Stellar variability underpins our knowledge of the cosmological distance ladder, and provides...
SN 2008S: A Cool Super-Eddington Wind in a Supernova Impostor (2008)
Smith, Nathan, Ganeshalingam, Mohan, Li, Weidong, Chornock, Ryan, Steele, Thea N., Silverman, Jeffrey M., ...
We present visual-wavelength photometry and spectroscopy of SN2008S. Based on the relatively low peak luminosity for a supernova (SN) of M_R = -13.9 mag and moderate outflow speeds of \la 600 km/s...
Smith, Nathan, Hinkle, Kenneth H., Ryde, Nils
We present high-resolution 4.6micron CO spectra of the circumstellar environments of two RSGs that are potential SN progenitors: Betelgeuse and VY CMa. Around Betelgeuse, 12CO emission within 3arcsec...
Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample (2008)
Poznanski, Dovi, Butler, Nathaniel, Filippenko, Alexei V., Ganeshalingam, Mohan, Li, Weidong, Bloom, Joshua S., ...
In the epoch of precise and accurate cosmology, cross-confirmation using a variety of cosmographic methods is paramount to circumvent systematic uncertainties. Owing to progenitor histories and...
Smith, Nathan, Silverman, Jeffrey M., Chornock, Ryan, Filippenko, Alexei V., Wang, Xiaofeng, Li, Weidong, ...
We present optical photometry and spectroscopy of SN2005ip for the first 3yr after discovery, showing an underlying Type II-L SN interacting with a steady wind to yield an unusual Type IIn spectrum....
The Carina Nebula: A Laboratory for Feedback and Triggered Star Formation (2008)
Smith, Nathan, Brooks, Kate J.
The Carina Nebula (NGC 3372) is our richest nearby laboratory in which to study feedback through UV radiation and stellar winds from very massive stars during the formation of an OB association, at...
A Blast Wave from the 1843 Eruption of Eta Carinae (2008)
Very massive stars shed much of their mass in violent precursor eruptions as luminous blue variables (LBVs) before reaching their most likely end as supernovae, but the cause of LBV eruptions is...
Hrivnak, Bruce J., Smith, Nathan, Su, Kate Y. L., Sahai, Raghvendra
We have carried out a spatial-kinematical study of three proto-planetary nebulae, IRAS 16594-4656, Hen 3-401, and Rob 22. High-resolution H2 images were obtained with NICMOS on the HST and...
A Three-Decade Outburst of the LMC Luminous Blue Variable R127 Draws to a Close (2008)
Walborn, Nolan R., Stahl, Otmar, Gamen, Roberto C., Szeifert, Thomas, Morrell, Nidia I., Smith, Nathan, ...
The paradigmatic Luminous Blue Variable R127 in the Large Magellanic Cloud has been found in the intermediate, peculiar early-B state, and substantially fainter in visual light, signaling the final...
Lisa Fischer, Jeff Mai, Zack Heath, Lisa Bell, Tony Fair, April Grossberger, ...
Aerial surveys have been conducted over the past six years to map and monitor hardwood mortality and subsequently target ground-based surveys for the early detection of Phytophthora ramorum, the...
iRun: Interactive Rendering of Large Unstructured Grids (2008)
Jean M. Favre, Dirk Reiners (editors, Huy T. Vo, Steven P. Callahan, Nathan Smith, ...
We present iRun, a system for interactively volume rendering large unstructured grids on commodity PCs. Rendering arbitrarily large datasets has been an active area of research for many years....
Smith, Nathan, Chornock, Ryan, Li, Weidong, Ganeshalingam, Mohan, Silverman, Jeffrey M., Foley, Ryan J., ...
SN2006tf is the third most luminous SN discovered so far, after SN2005ap and SN2006gy. SN2006tf is valuable because it provides a link between two regimes: (1) luminous type IIn supernovae powered by...
Smith, Nathan, Conti, Peter S.
(abridged) We propose the new designation ``WNH'' for luminous Wolf-Rayet (WR) stars of the nitrogen sequence with H in their spectra. These are commonly called WNL stars (e.g., WN7h), but this new...
Late-time observations of SN2006gy: Still Going Strong (2008)
Smith, Nathan, Foley, Ryan J., Bloom, Joshua S., Li, Weidong, Filippenko, Alexei V., Gavazzi, Raphael, ...
Owing to its extremely high luminosity and long duration, SN2006gy radiated more energy in visual light than any other known SN. Two hypotheses to explain its high luminosity -- that it was powered...
Episodic Mass Loss and Pre-SN Circumstellar Envelopes (2008)
I discuss observational clues concerning episodic mass-loss properties of massive stars in the time before the final supernova explosion. In particular, I will focus on the mounting evidence that...
Eta Carinae and Nebulae Around Massive Stars: Similarities to Planetary Nebulae? (2008)
I discuss some observational properties of aspherical nebulae around massive stars, and conclusions inferred for how they may have formed. Whether or not these ideas are applicable to the shaping of...
Stephen F. Bush Nathan Smith (2008)
Prediction Of Node, Stephen F. Bush, Nathan Smith
this paper is to consider the theoretical lower limit on route update overhead in a wireless environment. There is a plethora of ad hoc networking routing protocols with more routing protocols...
The Detection of a Light Echo from the Type Ia Supernova 2006X in M100 (2007)
Wang, Xiaofeng, Li, Weidong, Filippenko, Alexei V., Foley, Ryan J., Smith, Nathan, Wang, Lifan
We report the discovery of a light echo (LE) from the Type Ia supernova (SN) 2006X in the nearby galaxy M100. The presence of the LE is supported by analysis of both the Advanced Camera for Surveys...
Shell-shocked diffusion model for the light curve of SN2006gy (2007)
Smith, Nathan, McCray, Richard
We explore a simple model for the high luminosity of SN 2006gy involving photon diffusion of shock-deposited thermal energy. The distinguishing property of the model is that the large ``stellar''...
Independent Signs of Lower Mass-Loss Rates for O-Type Stars (2007)
I discuss observational evidence -- independent of the direct spectral diagnostics of stellar winds themselves -- suggesting that mass-loss rates for O stars need to be revised downward by roughly a...
SN 2006gy radiated far more energy in visual light than any other supernova so far, and potential explanations for its energy demands have implications for galactic chemical evolution and the deaths...
A silicate disk in the heart of the Ant (2007)
Chesneau, Olivier, Lykou, Foteini, Balick, Bruce, Lagadec, Eric, Matsuura, Mikako, Smith, Nathan, ...
We aim at getting high spatial resolution information on the dusty core of bipolar planetary nebulae to directly constrain the shaping process. Methods: We present observations of the dusty core of...
Smith, Nathan, Townsend, Richard H. D.
We present a semi-analytic model for shaping the nebula around eta Carinae that accounts for the simultaneous production of bipolar lobes and an equatorial disk through a rotating surface explosion....
A Census of the Carina Nebula -- II. Energy Budget and Global Properties of the Nebulosity (2007)
Smith, Nathan, Brooks, Kate J.
The first paper in this series took a direct census of energy input from the known OB stars in the Carina Nebula, and in this paper we study the global properties of the surrounding nebulosity. We...
Smith, Nathan, Bally, John, Walawender, Josh
We report the discovery of two new circumstellar ring nebulae in the western Carina Nebula. The brighter object, SBW1, resembles a lidless staring eye and encircles a B1.5 Iab supergiant. Its size is...
Galactic Twins of the Nebula Around SN 1987A: Hints that LBVs may be supernova progenitors (2007)
I discuss outstanding questions about the formation of the ring nebula around SN1987A and some implications of similar ring nebulae around Galactic B supergiants. There are notable obstacles for the...
High Resolution Spectroscopy of SN1987A's Rings: He I 10830 and H-alpha from the Hotspots (2007)
Smith, Nathan, McCray, Richard
We present the first high-dispersion spectroscopy of He I 10830 from the hotspots in the ring around SN1987A, obtained at Gemini South, spatially resolving the near and far sides of the ring. We...
Galactic Twins of the Ring Nebula Around SN1987A and a Possible LBV-like Phase for Sk-69 202 (2007)
Some core-collapse supernovae show clear signs of interaction with dense circumstellar material that often appears to be non-spherical. Circumstellar nebulae around supernova progenitors provide...
Smith, Nathan, Foley, Ryan J., Filippenko, Alexei V.
We present evidence for the formation of dust grains in an unusual Type Ib SN based on late-time spectra of SN 2006jc. The progenitor suffered an LBV-like outburst just 2 yr earlier, and we propose...
A silicate disk in the heart of the Ant (2007)
Chesneau, Olivier, Lykou, Foteini, Balick, Bruce, Lagadec, Eric, Matsuura, Mikako, Smith, Nathan, ...
We aim at getting high spatial resolution information on the dusty core of bipolar planetary nebulae to directly constrain the shaping process. Methods: We present observations of the dusty core of...
A silicate disk in the heart of the Ant (2007)
Chesneau, Olivier, Lykou, Foteini, Balick, Bruce, Lagadec, Eric, Matsuura, Mikako, Smith, Nathan, ...
We aim at getting high spatial resolution information on the dusty core of bipolar planetary nebulae to directly constrain the shaping process. Methods: We present observations of the dusty core of...
Independent signs of lower mass-loss rates for O-type stars (2007)
I discuss observational evidence – independent of the direct spectral diagnostics of stellar winds themselves – suggesting that mass-loss rates for O stars need to be revised downward by roughly...
Independent signs of lower mass-loss rates for O-type stars (2007)
I discuss observational evidence – independent of the direct spectral diagnostics of stellar winds themselves – suggesting that mass-loss rates for O stars need to be revised downward by roughly...
SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium (2006)
Foley, Ryan J., Smith, Nathan, Ganeshalingam, Mohan, Li, Weidong, Chornock, Ryan, Filippenko, Alexei V.
We present optical photometry and spectra of the peculiar Type Ib supernova (SN) 2006jc. Strong and relatively narrow He I emission lines indicate the progenitor star exploded inside a dense...
Smith, Nathan, Li, Weidong, Foley, Ryan J., Wheeler, J. Craig, Pooley, Dave, Chornock, Ryan, ...
(abridged) We report our discovery and observations of the peculiar Type IIn supernova SN2006gy in NGC1260, revealing that it reached a peak magnitude of -22, making it the most luminous supernova...
Spitzer images of the luminous blue variable (LBV) candidate HD168625 reveal the existence of a bipolar nebula several times larger than its previously-known equatorial dust torus. The outer nebula...
Smith, Nathan, Ferland, Gary J.
We present models that reproduce the observed double-shell structure of the Homunculus Nebula around eta Carinae, including the stratification of infrared H2 and [FeII] emission seen in data obtained...
Giant Outbursts of the Eta Carinae-P Cygni Type (2006)
I discuss the role of short-duration eruptive mass loss in the evolution of very massive stars. Giant eruptions of Luminous Blue Variables (LBVs) like the 19th century event of $\eta$ Carinae can...
Eruptive Mass Loss in Very Massive Stars and Population III Stars (2006)
I discuss the role played by short-duration eruptive mass loss in the evolution of very massive stars. Giant eruptions of Luminous Blue Variables (LBVs) like the 19th century event of eta Carinae can...
Spitzer Space Telescope Infrared Imaging and Spectroscopy of the Crab Nebula (2006)
Temim, Tea, Gehrz, Robert D., Woodward, Charles E., Roellig, Thomas L., Smith, Nathan, Rudnick, Lawrence R., ...
We present 3.6, 4.5, 5.8, 8.0, 24, and 70 micron images of the Crab Nebula obtained with the Spitzer Space Telescope IRAC and MIPS cameras, Low- and High-resolution Spitzer IRS spectra of selected...
Smith, Nathan, Owocki, Stanley P.
We suggest that the mass lost during the evolution of very massive stars may be dominated by optically thick, continuum-driven outbursts or explosions, instead of by steady line-driven winds. In...
Cleaning up Eta Carinae: Detection of Ammonia in the Homunculus (2006)
Smith, Nathan, Brooks, Kate J., Koribalski, Baerbel S., Bally, John
We report the first detection of ammonia in the Homunculus nebula around eta Carinae, which is also the first detection of emission from a polyatomic molecule in this or any other luminous blue...
Shuping, R. Y., Kassis, Marc, Morris, Mark, Smith, Nathan, Bally, John
We present 8--13 micron low resolution spectra (R~100) of 8 low-mass protostellar objects ("proplyds") in the Orion Nebula using the Long Wavelength Spectrometer (LWS) at the W. M. Keck Observatory....
Evolution of the Reverse Shock Emission from SNR 1987A (2006)
Heng, Kevin, McCray, Richard, Zhekov, Svetozar A., Challis, Peter M., Chevalier, Roger A., Crotts, Arlin P. S., ...
We present new (2004 July) G750L and G140L Space Telescope Imaging Spectrograph (STIS) data of the H-alpha and Ly-alpha emission from supernova remnant (SNR) 1987A. With the aid of earlier data, from...
High resolution long-slit spectra obtained with the Phoenix spectrograph on Gemini South provide our most accurate probe of the three dimensional structure of the Homunculus around eta Car. The new...
The UV Scattering Halo of the Central Source Associated with Eta Carinae (2006)
Hillier, D. John, Gull, T., Nielsen, K., Sonneborn, G., Iping, R., Smith, Nathan, ...
We have made an extensive study of the UV spectrum of Eta Carinae, and find that we do not directly observe the star and its wind in the UV. Because of dust along our line of sight, the UV light that...
A Census of the Carina Nebula. I: Cumulative Energy Input from Massive Stars (2006)
(abridged) The Carina Nebula (NGC 3372) is our richest nearby laboratory in which to study feedback through UV radiation and stellar winds from very massive stars during the formation of an OB...
The Limits of Motion Prediction Support for Ad hoc Wireless Network Performance (2005)
Bush, Stephen F., Smith, Nathan
A fundamental understanding of gain provided by motion prediction in wireless ad hoc routing is currently lacking. This paper examines benefits in routing obtainable via prediction. A theoretical...
The reverse shock of SNR1987A at 18 years after outburst (2005)
Smith, Nathan, Zhekov, Svetozar A., Heng, Kevin, McCray, Richard, Morse, Jon A., Gladders, Mike
We use low-dispersion spectra obtained at the Magellan Observatory to study the broad H-alpha emission from the reverse shock of the infant supernova remnant SNR1987A. These spectra demonstrate that...
Smith, Nathan, Hartigan, Patrick
We present moderate and high-dispersion 1-2.5 micron spectra of the 10 arcsec nebula around P Cygni, dominated by bright emission lines of [Fe II]. Observed [Fe II] line ratios disagree with...
COUP census of X-ray stars in BN-KL and OMC-1S (2005)
Grosso, Nicolas, Feigelson, Eric, Getman, Konstantin, Townsley, Leisa, Broos, Patrick, Flaccomio, Ettore, ...
We present a study of the X-ray sources detected in the vicinity of two density peaks in the Orion Molecular Cloud 1 behind the Orion Nebula Cluster (ONC), as seen in the exceptionally deep (~10...
RIT Undergraduate Symposium 2004 (2005)
Esposito, A., Griggs, Allison, Gutterman, A., James, A., Ocon, A., George, Matt, ...
The Rochester Institute of Technology Undergraduate Symposium Showcases Scientific Research 2004. The Symposium recognizes the outstanding research of students in the Kate Gleason College of...
RIT Undergraduate Symposium 2004 (2005)
Esposito, A., Griggs, Allison, Gutterman, A., James, A., Ocon, A., George, Matt, ...
The Rochester Institute of Technology Undergraduate Symposium Showcases Scientific Research 2004. The Symposium recognizes the outstanding research of students in the Kate Gleason College of...
RIT Undergraduate Symposium 2004 (2005)
Esposito, A., Griggs, Allison, Gutterman, A., James, A., Ocon, A., George, Matt, ...
The Rochester Institute of Technology Undergraduate Symposium Showcases Scientific Research 2004. The Symposium recognizes the outstanding research of students in the Kate Gleason College of...
The [O III] Veil: Astropause of Eta Carinae's Wind? (2005)
Smith, Nathan, Morse, Jon A., Bally, John
We present narrowband images of eta Carinae in the light of [O III] 5007 obtained with HST/WFPC2, as well as a ground-based image in the same emission line with a larger field of view. These images...
Thermal Dust Emission from Proplyds, Unresolved Disks, and Shocks in the Orion Nebula (2005)
Smith, Nathan, Bally, John, Shuping, Ralph Y., Morris, Mark, Kassis, Marc
We present a new 11.7 micron mosaic image of the Orion nebula obtained with T-ReCS on Gemini South. The map includes the BN/KL region, the Trapezium, and OMC-1 South. Excluding BN/KL, we detect 91...
Kinematic Structure of H2 and [Fe II] in the Bipolar Planetary Nebula M 2-9 (2005)
Smith, Nathan, Balick, Bruce, Gehrz, Robert D.
We present high-dispersion long-slit IR spectra of the double-shell bipolar planetary nebula M 2-9 in the emission lines [Fe II] 16435 and H2 v=1--0 S(1) 21218. H2 spectra reveal for the first time...
COUP census of X-ray stars in BN-KL and OMC-1S (2005)
Grosso, Nicolas, Feigelson, Eric, Getman, Konstantin, Townsley, Leisa, Broos, Patrick, Flaccomio, Ettore, ...
We present a study of the X-ray sources detected in the vicinity of two density peaks in the Orion Molecular Cloud 1 behind the Orion Nebula Cluster (ONC), as seen in the exceptionally deep (~10...
Physical conditions in the Homunculus (2005)
Ferland, Gary J., Abel, Nick, Davidson, Kris, Smith, Nathan
Conditions within the Homunculus nebula around Eta Car are determined by many of the same physical processes that occur in molecular clouds in the interstellar medium. But there is one major...
Discovery of a candidate protoplanetary disk around the embedded source IRc9 in Orion (2005)
We report the detection of spatially-extended mid-infrared emission around the luminous embedded star IRc9 in OMC-1, as seen in 8.8, 11.7, and 18.3 micron images obtained with T-ReCS on Gemini South....
COUP census of X-ray stars in BN-KL and OMC-1S (2005)
Grosso, Nicolas, Feigelson, Eric, Getman, Konstantin, Townsley, Leisa, Broos, Patrick, Flaccomio, Ettore, ...
We present a study of the X-ray sources detected in the vicinity of two density peaks in the Orion Molecular Cloud 1 behind the Orion Nebula Cluster (ONC), as seen in the exceptionally deep (~10...
COUP census of X-ray stars in BN-KL and OMC-1S (2005)
Grosso, Nicolas, Feigelson, Eric, Getman, Konstantin, Townsley, Leisa, Broos, Patrick, Flaccomio, Ettore, ...
We present a study of the X-ray sources detected in the vicinity of two density peaks in the Orion Molecular Cloud 1 behind the Orion Nebula Cluster (ONC), as seen in the exceptionally deep (~10...
High-resolution spectra of [Fe II] 16435 around eta Carinae provide powerful diagnostics of the geometry and kinematics of the ``Little Homunculus'' (LH) growing inside the larger Homunculus nebula....
Opening the Treasure Chest: A Newborn Star Cluster Emerges from its Dust Pillar in Carina (2004)
Smith, Nathan, Stassun, Keivan G., Bally, John
We present detailed observations of the Treasure Chest, a compact nebula at the head of a dust pillar in the southern Carina nebula. This object is of interest because it is an example of a dense...
Bipolar Symbiotic Planetary Nebulae in the Thermal-IR: M2-9, Mz3, and He2-104 (2004)
Smith, Nathan, Gehrz, Robert D.
We present thermal-IR images of three extreme bipolar objects, M2-9, Mz3, and He2-104. They are bipolar planetary nebulae with bright central stars and are thought to be powered by symbiotic binary...
New Silhouette Disks with Reflection Nebulae and Outflows in the Orion Nebula and M43 (2004)
Smith, Nathan, Bally, John, Licht, Daniel, Walawender, Josh
We report the detection of several new circumstellar disks seen in silhouette in the outskirts of the Orion nebula and M43, detected as part of our Halpha survey of Orion with the HST/ACS. Several of...
Smith, Nathan, Dong, Yufeng, Lian, Jane B., Pratap, Jitesh, Kingsley, Paul D., Van Wijnen, Andre J., ...
Identifying the genetic pathways that regulate skeletal development is necessary to correct a variety of cartilage and bone abnormalities. The Runx family of transcription factors play a fundamental...
The Missing Luminous Blue Variables and the Bistability Jump (2004)
Smith, Nathan, Vink, Jorick S., De Koter, Alex
We discuss an interesting feature of the distribution of luminous blue variables on the H-R diagram, and we propose a connection with the bistability jump in the winds of early-type supergiants....
The Systemic Velocity of Eta Carinae (2004)
High-resolution spectra of molecular hydrogen in the Homunculus nebula allow for the first direct measurement of the systemic velocity of Eta Carinae. Near-infrared long-slit data for H2 1-0 S(1)...
The Purple Haze of Eta Carinae: Binary-Induced Variability? (2004)
Smith, Nathan, Morse, Jon A., Collins, Nicholas R., Gull, Theodore R.
Asymmetric variability in ultraviolet images of the Homunculus obtained with the Advanced Camera for Surveys/High Resolution Camera on the Hubble Space Telescope suggests that Eta Carinae is indeed a...
Thermal-IR Detection of Optical Outflow Sources in OMC1 South (2004)
Smith, Nathan, Bally, John, Shuping, Ralph Y., Morris, Mark, Hayward, Thomas L.
We present the first thermal-infrared imaging photometry for several embedded sources in the OMC1 South cloud core in the Orion nebula, and propose that some of these drive optical Herbig-Haro jets...
Carina's Defiant Finger: HST Observations of a Photoevaporating Globule in NGC3372 (2004)
Smith, Nathan, Barba, Rodolfo, Walborn, Nolan R.
We present HST/WFPC2 images of a prominent externally-ionized molecular globule in the Carina Nebula (NGC3372), supplemented with ground-based IR images and visual-wavelength spectra. This molecular...
We present optical spectra of the ionized `Outer Ejecta' of Eta Carinae that reveal differences in chemical composition at various positions. In particular, young condensations just outside the dusty...
Spatially extended K I 7699 emission in the nebula of VY CMa: Kinematics and geometry (2004)
Long-slit echelle spectra reveal bright extended emission from the K I lambda7699 resonance line in the reflection nebula surrounding the extreme red supergiant VY Canis Majoris. The central star has...
Kinematics and Ultraviolet to Infrared Morphology of the Inner Homunculus of η Carinae (2004)
Smith, Nathan, Morse, Jon A., Gull, Theodore R., Hillier, D. John, Gehrz, Robert D., Walborn, Nolan R., ...
We present the first ultraviolet and optical images of η Car and itscircumstellar Homunculus nebula, obtained with the Advanced Camera forSurveys/High Resolution Camera (ACS/HRC) on board the Hubble...
Latitude-dependent effects in the stellar wind of Eta Carinae (2003)
Smith, Nathan, Davidson, Kris, Gull, Theodore R., Ishibashi, Kazunori, Hillier, John
The Homunculus reflection nebula around eta Carinae provides a rare opportunity to observe the spectrum of a star from multiple latitudes. We present STIS spectra of several positions in the...
Thesis (M.S.) -- Pacific University, 2003.
Near-infrared emission lines provide unique diagnostics of the geometry, structure, kinematics, and excitation of eta Carinae's circumstellar ejecta, and give clues to the nature of its wind. The...
Humphreys, Roberta M., Davidson, Kris, Smith, Nathan
IRC +10420 is one of the extreme hypergiant stars that define the empirical upper luminosity boundary in the HR diagram. During their post--RSG evolution, these massive stars enter a temperature...
A disrupted circumstellar torus inside eta Carinae's Homunculus Nebula (2002)
Smith, Nathan, Gehrz, Robert D., Hinz, Phillip M., Hoffmann, William F., Mamajek, Eric E., Meyer, Michael R., ...
We present thermal infrared images of the bipolar nebula surrounding eta Carinae at six wavelengths from 4.8 to 24.5 microns. These were obtained with the MIRAC3 camera system at the Magellan...
Latitudinal dependence of density and outflow velocity in the stellar wind of Eta Carinae / (2002)
Thesis (Ph. D.)--University of Minnesota, 2002.
Speech recognition using SVMs (2002)
An important issue in applying SVMs to speech recognition is the ability to classify variable length sequences. This paper presents extensions to a standard scheme for handling this variable length...
Speech recognition using SVMs (2002)
An important issue in applying SVMs to speech recognition is the ability to classify variable length sequences. This paper presents extensions to a standard scheme for handling this variable length...
Potential Use of Thermoelectric Modules for a Small Quantity Thermoelectric Beverage Cooler. (1998)
This report explores the use of thermoelectric modules as a concept for a small quantity beverage cooler that would enable a soldier to cool a standard military canteen of water 30 degrees Fahrenheit...
A Proto-Malaitan Lexicon by Richard Levy and Nathan Smith (1969)
Levy, Richard, Smith, Nathan, Newton, Peter, Capell, Arthur
31 page text. -- A proto-Malaitan lexicon. By Richard Levy and Nathan Smith. On the bottom on some pages the text is fading.. Language as given: Marovo
Project (M.A.)--California State University, Sacramento, 1968.
Motivation: theory and practice--[microform] /--Nathan Smith. (1967)
Project (M.A.)--California State University, Sacramento, 1967.
FARM LEVEL IMPACTS OF THE 2002 FARM BILL ON A GEORGIA AND NORTH CAROLINA FARM
The 2002 Farm Bill eliminates the peanut quota program and establishes a marketing loan program for peanuts. A Georgia and North Carolina peanut model farm are developed to examine farm level impacts...