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...
Doppler and modulation tomography of XTE J1118+480 in quiescence (2009)
Calvelo, D. E., Vrtilek, S. D., Steeghs, D., Torres, M. A. P., Neilsen, J., Filippenko, A. V., ...
We present Doppler and modulation tomography of the X-ray nova XTE J1118+480 with data obtained during quiescence using the 10-m Keck II telescope. The hot spot where the gas stream hits the...
Vrtilek, S. D., Boroson, B., Hunacek, A., Gies, D, Bolton, C. T.
(Shortened) Ultraviolet observations of the black hole X-ray binary Cygnus X-1 were obtained using the STIS on HSTubble. We detect P Cygni line features show strong, broad absorption components when...
The Eccentric Accretion Disc of the Black Hole A0620-00 (2007)
Neilsen, J., Steeghs, D., Vrtilek, S. D.
We present spectroscopic observations of the quiescent black hole binary A0620-00 with the the 6.5-m Magellan Clay telescope at Las Campanas Observatory. We measure absorption-line radial velocities...
We present pulse-phase X-ray spectroscopy of the high-mass X-ray pulsar SMC X-1 from five different epochs, using Chandra X-ray Observatory ACIS-S and XMM-Newton EPIC-pn data. The X-ray spectrum...
Rotational modulation of X-ray emission in Orion Nebula young stars (2005)
Flaccomio, E., Micela, G., Sciortino, S., Feigelson, E. D., Herbst, W., Favata, F., ...
We investigate the spatial distribution of X-ray emitting plasma in a sample of young Orion Nebula Cluster stars by modulation of their X-ray light-curves due to stellar rotation. The study, part of...
Photoionized Lines in the X-ray Spectra of SMC X-1 (2005)
Vrtilek, S. D., Raymond, J. C., Boroson, B. S., McCray, R.
We present a detailed spectral analysis of Chandra/ACIS-S CC mode observations of the massive X-ray binary system SMC X-1. The system was observed during both the high and low X-ray states of the...
Phase Variation in the Pulse Profile of SMC X-1 (2004)
Neilsen, J., Hickox, R. C., Vrtilek, S. D.
We present the results of timing and spectral analysis of X-ray high state observations of the high-mass X-ray pulsar SMC X-1 with Chandra, XMM-Newton, and ROSAT, taken between 1991 and 2001. The...
Simultaneous ASCA and HST/GHRS observations of Cygnus X-2/V1341 Cygni (2003)
Vrtilek, S. D., Raymond, J. C., Boroson, B., McCray, R., Smale, A., Kallman, T., ...
We present results from ultraviolet and X-ray observations of the low mass X-ray binary Cygnus X-2. The simultaneous HST/GHRS and ASCA observations took place during the low state of an 82-day cycle....
Nebular vs. Stellar Wind Abundances in NGC 6543 (2003)
An early analysis of Chandra observations of the planetary nebula NGC 6543 suggested that the location and the derived temperature for the X-ray emitting region is inconsistent with the abundances...
Comment on "Chandra Reveals The X-ray Glint in the Cat's Eye" (2002)
Chu et al (2001; ApJ, 533, L69) report that they find the diffuse X-ray emission from the Cat's Eye Nebula, NGC 6543, to be inconsistent with nebular abundances but consistent with abundances...
Complete and simultaneous spectral observations of the black hole X-Ray nova XTE J1118+480 (2001)
McClintock, J.E., Haswell, C.A., Garcia, M.R., Drake, J.J., Hynes, R.I., Marshall, H.L., ...
The X-ray nova XTE J1118+480 suffers minimal extinction (b = 62) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. conducted the first such study, which...
Complete and Simultaneous Spectral Observations of the Black-Hole X-ray Nova XTE J1118+480 (2001)
McClintock, J. E., Haswell, C. A., Garcia, M. R., Drake, J. J., Hynes, R. I., Marshall, H. L., ...
The X-ray nova XTE J1118+480 suffers minimal extinction (b = 62 degrees) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. (2000) conducted the first such...
Vrtilek, S.D, Quaintrell, H., Boroson, B., Still, M., Fiedler, H., O'Brien, K., ...
We present results from multiwavelength observations of the Hercules X-1 system during a short high state (SHS) and during an anomalous low state (ALS). The magnitude of deviation from spin-up...
Observations of Hercules X-1 during the 1998 July Short High State (2001)
Still, M., Brien, K. O', Horne, K., Hudson, D., Boroson, B., Vrtilek, S.D., ...
Atmospheric Reflection during an Anomalous Low State of Hercules X-1 (2001)
Still, M., Brien, K. O', Horne, K., Boroson, B., Titarchuk, L.G., Engle, K., ...
Keck II spectroscopy of mHz quasi-periodic oscillations in Hercules X-1 (2001)
Brien, K. O', Horne, K., Boroson, B., Still, M.D., Gomer, R., Oke, J.B., ...
Structure of the X-ray Emission from the Jet of 3C 273 (2000)
Marshall, H. L., Harris, D. E., Grimes, J. P., Drake, J. J., Fruscione, A., Juda, M., ...
We present images from five observations of the quasar 3C 273 with the Chandra X-ray Observatory. The jet has at least four distinct features which are not resolved in previous observations. The...
Discovery of mHz UV Quasiperiodic Oscillations in Hercules X-1 (2000)
Boroson, B., O'Brien, K., Horne, K., Kallman, T., Still, M., Boyd, P. T., ...
Observations of the ultraviolet continuum of the X-ray binary system Her X-1/HZ Herculis with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope show quasiperiodic oscillations...
Models of X-ray Photoionization in LMC X-4: Slices of a Stellar Wind (1998)
Boroson, B., Kallman, T., McCray, R., Vrtilek, S. D., Raymond, J.
We show that the orbital variation in the UV P Cygni lines of the X-ray binary LMC X-4 results when X-rays photoionize nearly the entire region outside of the X-ray shadow of the normal star. We fit...
Hopkins Ultraviolet Telescope Observations of Her X-1 (1997)
Boroson, B., Blair, W. P., Davidsen, A. F., Vrtilek, S. D., Raymond, J., Long, K. S., ...
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...
Simultaneous HST/ASCA Observations of LMC X-4: X-ray Ionization Effects on a Stellar Wind (1997)
Vrtilek, S. D., Boroson, B., Cheng, F. H., McCray, R., Nagase, F.
We present first results from simultaneous ultraviolet (UV; HST/GHRS) and X-ray (ASCA) observations of the 13.5s pulsar LMC X-4 taken in 1996 May. The GHRS data are the highest resolution (both...