Hopkins Ultraviolet Telescope Observations of Her X-1 (2009)
Bram Boroson, William P. Blair, Arthur F. Davidsen, S. D. Vrtilek, John Raymond, Knox S. Long, ...
We have obtained a far-ultraviolet spectrum of the X-ray binary Hercules X-1/HZ Herculis using the Hopkins Ultraviolet Telescope aboard the Astro-1 space shuttle mission in 1990 December. This is the...
The Effect of a Superoutburst on the White Dwarf and Disk of VW Hydri as observed with FUSE (2009)
Long, Knox S., Gaensicke, Boris T., Knigge, Christian, Froning, Cynthia S., Monard, Berto
We have used FUSE to obtain thirteen observations of the dwarf nova VW Hyi covering the period from the end of a superoutburst through the following normal outburst of the system. Here, we present...
Ghavamian, Parviz, Raymond, John C., Blair, William P., Long, Knox S., Tappe, Achim, Park, Sangwook, ...
We present mid-infrared (5-40 micron) spectra of shocked ejecta in the Galactic oxygen-rich supernova remnant G292.0+1.8, acquired with the IRS spectrograph on board the Spitzer Space Telescope. The...
Katsuda, Satoru, Petre, Robert, Long, Knox S., Reynolds, Stephen P., Winkler, P. Frank, Mori, Koji, ...
We report on the first X-ray proper-motion measurements of the nonthermally-dominated forward shock in the northeastern limb of SN 1006, based on two Chandra observations taken in 2000 and 2008. We...
Winkler, P. Frank, Twelker, Karl, Reith, Claudine N., Long, Knox S.
We report here the first study of proper motions of fast filaments in the young, oxygen-rich supernova remnant G292.0+1.8, carried out using a series of [O III] 5007 A emission-line images taken over...
Ejecta, Dust, and Synchrotron Radiation in B0540-69.3: A More Crab-Like Remnant than the Crab (2008)
Williams, Brian J., Borkowski, Kazimierz J., Reynolds, Stephen P., Raymond, John C., Long, Knox S., Morse, Jon A., ...
We present near and mid-infrared observations of the pulsar-wind nebula (PWN) B0540-69.3 and its associated supernova remnant made with the {\it Spitzer Space Telescope}. We report detections of the...
Stellar Exotica in 47 Tucanae (2008)
Knigge, Christian, Dieball, Andrea, Apellaniz, Jesus Maiz, Long, Knox S., Zurek, David R., Shara, Michael M.
We present far-UV spectroscopy obtained with HST for 48 blue objects in the core of 47 Tuc. Based on their position in a FUV-optical colour-magnitude diagram, these were expected to include...
Stellar Exotica in 47 Tucanae (2008)
Knigge, Christian, Dieball, Andrea, Maiz Apellaniz, Jesus, Long, Knox S., Zurek, David R., Shara, Michael M.
We present far-ultraviolet (FUV) spectroscopy obtained with the Hubble Space Telescope (HST) for 48 blue objects in the core of 47 Tuc. Based on their position in a FUV-optical colour-magnitude...
Chandra ACIS survey of M33 (ChASeM33): a first look (2008)
Plucinsky, Paul P., Williams, Benjamin, Long, Knox S., Gaetz, Terrance J., Sasaki, Manami, Pietsch, Wolfgang, ...
Chandra ACIS Survey of M33 (ChASeM33): A First Look (2007)
Plucinsky, Paul P., Williams, Benjamin, Long, Knox S., Gaetz, Terrance J., Sasaki, Manami, Pietsch, Wolfgang, ...
We present an overview of the Chandra ACIS Survey of M33 (ChASeM33): A Deep Survey of the Nearest Face-on Spiral Galaxy. The 1.4 Ms survey covers the galaxy out to $R \approx 18\arcmin (\approx 4$...
Gaetz, Terrance J., Blair, William P., Hughes, John P., Winkler, P. Frank, Long, Knox S., Pannuti, Thomas G., ...
We present and interpret new X-ray data for M33SNR21, the brightest X-ray supernova remnant (SNR) in M33. The SNR is in seen projection against (and appears to be interacting with) the bright HII...
Blair, William P., Ghavamian, Parviz, Long, Knox S., Williams, Brian J., Borkowski, Kazimierz J., Reynolds, Stephen P., ...
We present 3.6 - 160 micron infrared images of Kepler's supernova remnant (SN1604) obtained with the IRAC and MIPS instruments on the Spitzer Space Telescope. We also present MIPS SED low resolution...
Linnell, Albert P., Hoard, D. W., Szkody, Paula, Long, Knox S., Hubeny, Ivan, Gansicke, Boris, ...
We use FUSE, HST, and SDSS spectra of the cataclysmic variable SDSSJ0809 to illustrate procedures for calculating and testing system models. Our final model has an accretion disk temperature profile...
MV Lyrae in Low, Intermediate, and High States (2006)
Linnell, Albert P., Szkody, Paula, Gansicke, Boris, Long, Knox S., Sion, Edward M., Hoard, D. W., ...
We use analysis results from a low state of the VY Sculptoris system MV Lyrae, considered in an earlier paper (Hoard et al., 2004, ApJ, 604, 346), to study archival IUE spectra taken during an...
The James Webb Space Telescope (2006)
Gardner, Jonathan P., Mather, John C., Clampin, Mark, Doyon, Rene, Greenhouse, Matthew A., Hammel, Heidi B., ...
The James Webb Space Telescope (JWST) is a large (6.6m), cold (50K), infrared-optimized space observatory that will be launched early in the next decade. The observatory will have four instruments: a...
FUSE Spectroscopy of the White Dwarf in U Geminorum (2006)
Long, Knox S., Brammer, Gabriel, Froning, Cynthia S.
Observations of U Gem with FUSE confirm that the WD is heated by the outburst and cools during quiescence. At the end of an outburst, the best uniform temperature WD model fits to the data indicate a...
Probing Multiple Sight Lines through the SN 1006 Remnant by UV Absorption Spectroscopy (2006)
Winkler, P. Frank, Long, Knox S., Hamilton, Andrew J. S., Fesen, Robert A.
Absorption-line spectroscopy is an effective probe for cold ejecta within an SNR, provided that suitable background UV sources can be identified. For the SN 1006 remnant we have identified four such...
Dust Destruction in Type Ia Supernova Remnants in the Large Magellanic Cloud (2006)
Borkowski, Kazimierz J., Williams, Brian J., Reynolds, Stephen P., Blair, William P., Ghavamian, Parviz, Sankrit, Ravi, ...
We present first results from an extensive survey of Magellanic Clouds supernova remnants (SNRs) with the Spitzer Space Telescope. We describe IRAC and MIPS imaging observations at 3.6, 4.5, 5.8, 8,...
Science with the James Webb space telescope (2006)
Gardner, Jonathan P., Mather, John C., Clampin, Mark, Doyon, Rene, Greenhouse, Matthew A., Hammel, Heidi B., ...
The scientific capabilities of the James Webb Space Telescope (JWST) fall into four themes. The End of the Dark Ages: First Light and Reionization theme seeks to identify the first luminous sources...
Far-flung Filaments of Ejecta in the Young Supernova Remnant G292.0+1.8 (2005)
Winkler, P. Frank, Long, Knox S.
New optical images of the young SNR G292.0+1.8, obtained from the 0.9-m telescope at CTIO, show a more extensive network of filaments than had been known previously. Filaments emitting in [O III] are...
Far Ultraviolet Spectroscopy of (Non-magnetic) Cataclysmic Variables (2005)
HST and FUSE have provided high signal-to-noise, high-resolution spectra of a variety of cataclysmic variables and have allowed a detailed characterization of FUV emission sources in both high and...
FUV Spectroscopy of the Dwarf Novae SS Cygni and WX Hydri in Quiescence (2005)
Long, Knox S., Froning, Cynthia S., Knigge, Christian, Blair, William P., Kallman, Timothy R., Ko, Yuan-Kuen
We present time-resolved FUV spectra of the dwarf novae SS Cyg and WX Hyi in quiescence from observations using the Hopkins Ultraviolet Telescope on the Astro-1 and Astro-2 Space Shuttle missions and...
Revealing the Supernova Remnant Population of M33 with Chandra (2005)
Ghavamian, Parviz, Blair, William P., Long, Knox S., Sasaki, Manami, Gaetz, Terrance J., Plucinsky, Paul P.
We present results of a search for supernova remnants (SNRs) in archival Chandra images of M33. We have identified X-ray SNRs by comparing the list of Chandra, X-ray sources in M33 with tabulations...
Spiral waves and the secondary star in the nova-like variable V3885 Sgr (2005)
Hartley, Louise E., Murray, James R., Drew, Janet E., Long, Knox S.
We present seven nights' blue (4300–5000 Å) spectroscopy of the nova-like variable star V3885 Sgr. The line spectrum shows a typical combination of broad absorption and emission in Hγ, Hβ and He...
The far-ultraviolet spectrum of Z Camelopardalis in quiescence and standstill (2005)
Hartley, Louise E., Long, Knox S., Froning, Cynthia S., Drew, Janet E.
No abstract available.
Spiral waves and the secondary star in the nova-like variable V3885 Sgr (2005)
Hartley, Louise E., Murray, James R., Drew, Janet E., Long, Knox S.
We present seven nights' blue (4300–5000 Å) spectroscopy of the nova-like variable star V3885 Sgr. The line spectrum shows a typical combination of broad absorption and emission in Hγ, Hβ and He...
The far-ultraviolet spectrum of Z Camelopardalis in quiescence and standstill (2005)
Hartley, Louise E., Long, Knox S., Froning, Cynthia S., Drew, Janet E.
No abstract available.
Spiral waves and the secondary star in the nova-like variable V3885 Sgr (2005)
Hartley, Louise E., Murray, James R., Drew, Janet E., Long, Knox S.
We present seven nights' blue (4300–5000 Å) spectroscopy of the nova-like variable star V3885 Sgr. The line spectrum shows a typical combination of broad absorption and emission in Hγ, Hβ and He...
The far-ultraviolet spectrum of Z Camelopardalis in quiescence and standstill (2005)
Hartley, Louise E., Long, Knox S., Froning, Cynthia S., Drew, Janet E.
No abstract available.
Spiral waves and the secondary star in the nova-like variable V3885 Sgr (2005)
Hartley, Louise E., Murray, James R., Drew, Janet E., Long, Knox S.
We present seven nights' blue (4300–5000 Å) spectroscopy of the nova-like variable star V3885 Sgr. The line spectrum shows a typical combination of broad absorption and emission in Hγ, Hβ and He...
The far-ultraviolet spectrum of Z Camelopardalis in quiescence and standstill (2005)
Hartley, Louise E., Long, Knox S., Froning, Cynthia S., Drew, Janet E.
No abstract available.
Spiral waves and the secondary star in the nova-like variable V3885 Sgr (2005)
Hartley, Louise E., Murray, James R., Drew, Janet E., Long, Knox S.
We present seven nights' blue (4300–5000 Å) spectroscopy of the nova-like variable star V3885 Sgr. The line spectrum shows a typical combination of broad absorption and emission in Hγ, Hβ and He...
The far-ultraviolet spectrum of Z Camelopardalis in quiescence and standstill (2005)
Hartley, Louise E., Long, Knox S., Froning, Cynthia S., Drew, Janet E.
No abstract available.
The Far Ultraviolet Spectrum of Z Cam in Quiescence (2004)
Hartley, Louise, Long, Knox S., Froning, Cynthia S., Drew, Janet E
We have obtained Far Ultraviolet Spectroscopic Explorer (905-1187 Angstrom) spectra of the non-magnetic cataclysmic variable Z Cam during a period of quiescence. The spectrum resembles that of a hot...
Knigge, Christian, Araujo-Betancor, Sofia, Gaensicke, Boris T., Long, Knox S., Szkody, Paula, Hoard, D. W., ...
We present time-resolved, ultraviolet (UV) spectroscopy of the SW Sex star DW UMa in the high state. We confirm that, shortward of 1500 \AA, the high-state, UV continuum level is lower than the white...
Chandra HETG Spectra of SS Cyg and U Gem in Quiescence and Outburst (2004)
Mauche, Christopher W., Wheatley, Peter J., Long, Knox S., Raymond, John C., Szkody, Paula
Chandra HETG spectra of the prototypical dwarf novae SS Cyg and U Gem in quiescence and outburst are presented and discussed. When SS Cyg goes into outburst, it becomes dimmer in hard X-rays and...
Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence (2004)
Godon, Patrick, Sion, Edward M., Cheng, Fu-Hua, Szkody, Paula, Long, Knox S., Froning, Cynthia S.
We present a 904-1183 A spectrum of the dwarf nova VW Hydri taken with the Far Ultraviolet Spectroscopic Explorer during quiescence, eleven days after a normal outburst, when the underlying white...
Modeling the diverse fuv spectra of disk-dominated Cataclysmic variables (2004)
Knigge , Christian, Long , Knox S.
Los espectros de FUSE y HST de novas enanas en explosiones y de variables semejantes a novas presentan un amplio rango de características. En unos cuantos sistemas existen señales obvias de un...
A Far-Ultraviolet Survey of 47 Tucanae.II The Long-Period Cataclysmic Variable AKO 9 (2003)
Knigge, Christian, Zurek, David R., Shara, Michael M., Long, Knox S., Gilliland, Ronald L.
We present time-resolved, far-ultraviolet (FUV) spectroscopy and photometry of the 1.1 day eclipsing binary system AKO 9 in the globular cluster 47 Tucanae. The FUV spectrum of AKO 9 is blue and...
Hoard, D. W., Szkody, Paula, Froning, Cynthia S., Long, Knox S., Knigge, Christian
We present an analysis of the first far-ultraviolet observations of the SW Sextantis-type cataclysmic variable DW Ursae Majoris, obtained in November 2001 with the Far Ultraviolet Spectroscopic...
Gänsicke, Boris T., Szkody, Paula, De Martino, Domitilla, Beuermann, Klaus, Long, Knox S., Sion, Edward M., ...
Brief HST/STIS spectroscopic snapshot exposures of the cataclysmic variables 1RXSJ232953.9+062814, CE315, BZ UMa and EY Cyg reveal very large NV/CIV line flux ratios, similar to those observed in AE...
WZ Sge: FUSE Spectroscopy of the 2001 Outburst (2003)
Long, Knox S., Froning, Cynthia S., Gaensicke, Boris, Knigge, Christian, Sion, Edward M., Szkody, Paula
The short-period cataclysmic variable WZ Sge underwent its first dwarf nova outburst in 23 years in 2001 July. Here we describe 905-1187 Ang. spectra obtained with the Far Ultraviolet Spectroscopic...
Winkler, P. Frank, Gupta, Gaurav, Long, Knox S.
We report the first measurement of proper motions in the SN1006 remnant (G327.6+14.6) based entirely on digital images. CCD images from three epochs spanning a period of 11 years are used: 1987 from...
Modeling the Spectral Signatures of Accretion Disk Winds: A New Monte Carlo Approach (2002)
Long, Knox S., Knigge, Christian
Bipolar outflows are present in many disk-accreting astrophysical systems. In disk-accreting cataclysmic variables (CVs), these outflows are responsible for most of the strong features in the...
A Far-Ultraviolet Survey of 47 Tucanae. I. Imaging (2002)
Knigge, Christian, Zurek, David. R., Shara, Michael M., Long, Knox S.
We present results from the imaging portion of a far-ultraviolet (FUV) survey of the core of 47 Tucanae. We have detected 767 FUV sources, 527 of which have optical counterparts in archival HST/WFPC2...
The Optical Spectrum of the SN 1006 Supernova Remnant Revisited (2002)
Ghavamian, Parviz, Winkler, P. Frank, Raymond, John C., Long, Knox S.
We present the deepest optical spectrum acquired to date of Balmer-dominated shocks in the NW rim of SN 1006. We detect the broad and narrow components of H-alpha, H-beta and H-gamma and report the...
HST Spectroscopy of the Nucleus of M33 (2001)
Long, Knox S., Charles, Philip A., Dubus, Guillaume
We have used Hubble Space Telescope to obtain moderate resolution 1150-5700 Ang. spectroscopy of the nucleus of M33 and a blue star ~1 arcsec NNW of the nucleus in an attempt to find the optical...
Modelling the Spectral Signatures of Accretion Disk Winds in Cataclysmic Variables (2001)
Long, Knox S., Knigge, Christian
Bipolar outflows are known to be present in many disk-accreting astrophysical systems. In disk-dominated cataclysmic variables, these outflows are responsible for most of the features in UV and FUV...
First results from multi-wavelength observations during the 2001 outburst of WZ Sge (2001)
Kuulkers, Erik, Knigge, Christian, Steeghs, Danny, Wheatley, Peter J., Long, Knox S.
WZ Sge has shown superoutbursts in 1913, 1946 and 1978. On 2001 July 23 a new outburst was announced, about 10 years `too early'. Target of opportunity satellite observations with Chandra, FUSE, HST...
Using the Hopkins Ultraviolet Telescope and Hubble Space Telescope, observers have now obtained UV spectra with sufficient signal to noise and resolution to allow quantitative spectroscopic analyses...
Blair, William P., Sankrit, Ravi, Raymond, John C., Long, Knox S.
We present a Hubble Space Telescope/WFPC2 narrow-band H-alpha image of a region on the northeastern limb of the Cygnus Loop supernova remnant. This location provides a detailed example of where the...
Suntzeff, Nicholas B., Phillips, M. M., Covarrubias, R., Navarrete, M., Perez, J. J., Guerra, A., ...
We present the UBVRI light curves of the Type Ia supernova SN 1998bu which appeared in the nearby galaxy M96 (NGC 3368). M96 is a spiral galaxy in the Leo I group which has a Cepheid-based distance....
A Second UV "Light Bulb" behind the SN 1006 Remnant (1997)
Winkler, P. Frank, Long, Knox S.
A point X-ray source located 9 arcmin northeast of the center of SN~1006 has been spectroscopically identified as a background QSO, with a redshift of 0.335. The object is moderately bright, with...
The Ultraviolet Spectrum Of A Face-On Shock Wave In The Vela Supernova Remnant (1997)
John C. Raymond, William P. Blair, Knox S. Long, Jon Morse, ...
Ultraviolet emission lines in supernova remnants (SNRs) provide important clues to the shock velocities, densities, grain destruction, and thermal structure of the cooling regions in these objects....