Zobrazeno 1 - 10
of 493
pro vyhledávání: '"Vrtilek, S. D."'
Autor:
Dickey, John M., Vrtilek, S. D., McCollough, Michael, Boroson, Bram, Tomsick, John A., Bailyn, Charles, Blanchard, Jay M., Johnson, Charlotte
The rapid variability of X-ray binaries produces a wide range of X-ray states that are linked to activity across the electromagnetic spectrum. It is particularly challenging to study a sample of sources large enough to include all types in their vari
Externí odkaz:
http://arxiv.org/abs/2306.16663
X-ray Binaries (XRBs) consist of a compact object that accretes material from an orbiting secondary star. The most secure method we have for determining if the compact object is a black hole is to determine its mass: this is limited to bright objects
Externí odkaz:
http://arxiv.org/abs/2204.00346
Symbiotic stars show emission across the electromagnetic spectrum from a wide array of physical processes. At cm-waves both synchrotron and thermal emission is seen, often highly variable and associated with outbursts in the optical and X-rays. Most
Externí odkaz:
http://arxiv.org/abs/2102.07340
Autor:
Islam, Nazma, Vrtilek, S. D., Boroson, Bram, Kim, D. -W., O'Sullivan, E., McCollough, M. L., Fabbiano, G., Anderson, C., Burke, D. J., D'Abrusco, R., Fruscione, A., Lauer, J. L., Morgan, D., Mossman, A., Paggi, A., Trinchieri, G.
X-ray binaries exhibit a wide range of properties but there are few accepted methods to determine the nature of the compact object. Color-Color-Intensity diagrams have been suggested as a means of distinguishing between systems containing black holes
Externí odkaz:
http://arxiv.org/abs/2007.05810
We present phase-resolved spectroscopic observations of the low-mass X-ray binary V926 Sco (4U 1735-44), covering the orbital period of 0.23d, obtained with the Walter Baade 6.5m Magellan Telescope at the Las Campanas Observatory in June 2010 and Jun
Externí odkaz:
http://arxiv.org/abs/1310.0806
Autor:
Calvelo, D. E., Vrtilek, S. D., Steeghs, D., Torres, M. A. P., Neilsen, J., Filippenko, A. V., Hernandez, J. I. Gonzalez
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 accretion disc is seen in H-Alpha, H-Beta, He I Lambda-5876
Externí odkaz:
http://arxiv.org/abs/0905.1491
(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 X-ray source is behind the companion star and n
Externí odkaz:
http://arxiv.org/abs/0710.3499
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 of the secondary and make the most precise determin
Externí odkaz:
http://arxiv.org/abs/0710.3202
Autor:
Hickox, R. C., Vrtilek, S. D.
Publikováno v:
Astrophys.J.633:1064-1075,2005
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 consistently shows two distinct components, a hard powe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506438
Autor:
Flaccomio, E., Micela, G., Sciortino, S., Feigelson, E. D., Herbst, W., Favata, F., Harnden Jr., F. R., Vrtilek, S. D.
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 the Chandra Orion Ultradeep Project (COUP), is made
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506164