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Neutron Stars in X-ray Binaries and their Environments [PDF]

open access: greenJournal 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
arxiv   +5 more sources

News on the X-ray emission from hot subdwarf stars [PDF]

open access: yesOpen Astronomy, 2017
In latest years, the high sensitivity of the instruments on-board the XMM-Newton and Chandra satellites allowed us to explore the properties of the X-ray emission from hot subdwarf stars.
Palombara Nicola La, Mereghetti Sandro
doaj   +3 more sources

A ROSAT Survey of Contact Binary Stars [PDF]

open access: yesAstron.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.
Hunsch M.   +5 more
arxiv   +3 more sources

Near-infrared spectroscopy of 20 new Chandra sources in the Norma Arm [PDF]

open access: yesA&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 ...
Bauer, Franz E.   +4 more
arxiv   +3 more sources

Comparison of the H-alpha circumstellar disks in Be/X-ray binaries and Be stars [PDF]

open access: bronze, 2000
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
arxiv   +3 more sources

Tidal Interaction in High Mass X-ray Binaries and Symbiotic Stars [PDF]

open access: greenarXiv, 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
arxiv   +3 more sources

Modeling High Mass X-Ray Binaries to Double Neutron Stars through Common Envelope Evolution [PDF]

open access: greenThe Astrophysical Journal
We present detailed evolutionary simulations of wide binary systems with high-mass (8–20 M _⊙ ) donor stars and a 1.4 M _⊙ neutron star. Mass transfer in such binaries is dynamically unstable, and common envelope (CE) evolution is followed.
Yu-Dong Nie   +5 more
doaj   +3 more sources

Spectral Energy Distributions of Southern Binary X-Ray Sources

open access: yesThe Astrophysical Journal Supplement Series, 2023
The rapid variability of X-ray binaries (XRBs) 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 ...
John M. Dickey   +7 more
doaj   +1 more source

An Optically Discovered Outburst from XTE J1859+226

open access: yesThe Astrophysical Journal, 2023
Using the Zwicky Transient Facility, in 2021 February we identified the first known outburst of the black hole X-ray transient XTE J1859+226 since its discovery in 1999. The outburst was visible at X-ray, UV, and optical wavelengths for less than 20 days,
Eric C. Bellm   +15 more
doaj   +1 more source

Clumpy Wind Studies and the Nondetection of a Cyclotron Line in OAO 1657–415

open access: yesThe Astrophysical Journal, 2023
Winds of massive stars are suspected to be inhomogeneous (or clumpy), which biases the measures of their mass-loss rates. In high-mass X-ray binaries (HMXBs), the compact object can be used as an orbiting X-ray point source to probe the wind and ...
Pragati Pradhan   +13 more
doaj   +1 more source

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