Results 11 to 20 of about 236,218 (69)
Neutron Stars in X-ray Binaries and their Environments [PDF]
Journal of Astrophysics and Astronomy, 2017, Vol 38, Issue 3, 39, 2017 Neutron stars in X-ray binary systems are fascinating objects that display a wide range of timing and spectral phenomena in the X-rays. Not only parameters of the neutron stars, like magnetic field strength and spin period evolve in their active binary phase, the neutron stars also affect the binary systems and their immediate surroundings in many ways.
Biswajit Paul
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Comparison of the Hαcircumstellar disks in Be/X-ray binaries and Be stars [PDF]
, 2001 We present a comparative study of the circumstellar disks in Be/X-ray binaries and isolated Be stars based upon the H-alpha emission line. From this comparison it follows that the overall structure of the disks in the Be/X-ray binaries is similar to the disks of other Be stars, i.e. they are axisymmetric and rotationally supported.
R. Zamanov +6 more
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Tidal Interaction in High Mass X-ray Binaries and Symbiotic Stars [PDF]
arXiv, 2010 This paper summarizes our recent results on tidal interaction in high mass X-ray binaries and symbiotic stars. We demonstrate that the giant in symbiotic stars with orbital periods <1200 d are co-rotating (synchronized). The symbiotics MWC 560 and CD-4314304 probably have high orbital eccentricity.
R. Zamanov
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Calibrating X-ray binary luminosity functions via optical reconnaissance II. The high-mass XLF and globular cluster population of X-ray binaries in the low star-forming spiral M81 [PDF]
, 2022 We characterize the optical counterparts to the compact X-ray source population within the nearby spiral galaxy M81 using multi-band Hubble Space Telescope (HST) imaging data. By comparing the optical luminosities and colors measured for candidate donor stars and host clusters to stellar and cluster evolutionary models, respectively, we estimate the ...
arxiv +1 more source
X-ray Binaries in External Galaxies [PDF]
, 2023 X-ray appearance of normal galaxies is mainly determined by X-ray binaries powered by accretion onto a neutron star or a stellar mass black hole. Their populations scale with the star-formation rate and stellar mass of the host galaxy and their X-ray luminosity distributions show a significant split between star-forming and passive galaxies, both facts
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A ROSAT Survey of Contact Binary Stars [PDF]
Astron.J.131:633-637,2006, 2005 Contact binary stars are common variable stars which are all believed to emit relatively large fluxes of x-rays. In this work we combine a large new sample of contact binary stars derived from the ROTSE-I telescope with x-ray data from the ROSAT All-Sky Survey (RASS) to estimate the x-ray volume emissivity of contact binary stars in the galaxy.
arxiv +1 more source
A Population of Ultraluminous X-ray Sources with An Accreting Neutron Star [PDF]
, 2015 Most ultraluminous X-ray sources (ULXs) are believed to be X-ray binary systems, but previous observational and theoretical studies tend to prefer a black hole rather than a neutron star accretor. The recent discovery of 1.37 s pulsations from the ULX M82 X-2 has established its nature as a magnetized neutron star.
arxiv +1 more source
Near-infrared spectroscopy of 20 new Chandra sources in the Norma Arm [PDF]
A&A 568, A54 (2014), 2014 We report on CTIO/NEWFIRM and CTIO/OSIRIS photometric and spectroscopic observations of 20 new X-ray (0.5-10 keV) emitters discovered in the Norma Arm Region Chandra Survey (NARCS). NEWFIRM photometry was obtained to pinpoint the near-infrared counterparts of NARCS sources, while OSIRIS spectroscopy was used to help identify 20 sources with possible ...
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Long-term optical variability of high-mass X-ray binaries. II. Spectroscopy [PDF]
A&A 590, A122 (2016), 2016 We present the results of our monitoring program to study the long-term variability of the Halpha line in high-mass X-ray binaries. We have carried out the most complete optical spectroscopic study of the global properties of high-mass X-ray binaries so far with the analysis of more than 1100 spectra of 20 sources.
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Optical Sources Near the Bright X-Ray Source in NGC 1073 [PDF]
Astrophys.J. 629 (2005) 233-238, 2005 New HST observations show that the bright X-ray source in the face-on spiral galaxy NGC 1073 is located near a ring of recent star formation with an age of 8-16 Myr. This strengthens the association of X-ray sources in spiral galaxies emitting near or above the Eddington limit for a 20 solar mass black hole with recent star formation events.
arxiv +1 more source