Results 21 to 30 of about 236,218 (69)

Understanding the X-ray luminosity function of high mass X-ray binaries [PDF]

, 2010
High mass X-ray binary luminosity function (XLF) is an important tool for studying binary evolution processes and also the mass loss and consequent evolution in massive stars. We calculate the XLF for neutron star binaries using the standard scenario for formation and evolution of these systems.
arxiv   +1 more source

A review of rapid X-ray variability in X-ray binaries [PDF]

arXiv, 2004
A comprehensive review of aperiodic rapid X-ray variability (QPO and noise) in X-ray binaries with neutron stars and black holes.
arxiv  

The Mass Spectrum of X-Ray Binaries [PDF]

, 2005
This review summarizes the observational constraints on the mass spectrum of compact objects in X-ray binaries. We currently have 20 X-ray binaries with confirmed black holes, based on dynamical information (i.e. mass in excess of 3 Msun). In two cases, V404 Cyg and GRS 1915+105, the black hole mass exceeds the maximum predicted by current Type Ib ...
arxiv   +1 more source

Constraints on the mass and radius of neutron stars from X-ray observations [PDF]

arXiv, 2015
This article gives a very brief introduction about measuring the mass and radius of neutron star from X-ray observations. The masses and radii of neutron stars can be determined from photospheric radius expansion bursts in low-mass X-ray binaries, X-ray pulse profile modeling in accreting X-ray pulsars, gravitational redshift measurement in low-mass X ...
arxiv  

Hydrogen deficient donors in low-mass X-ray binaries [PDF]

arXiv, 2007
A number of X-ray binaries (neutron stars or black holes accreting from a companion star) have such short orbital periods that ordinary, hydrogen rich, stars do not fit in. Instead the mass-losing star must be a compact, evolved star, leading to the transfer of hydrogen deficient material to the neutron star.
arxiv  

On the Apparent Lack of Be X-ray Binaries with Black Holes [PDF]

, 2009
In the Galaxy there are 64 Be X-ray binaries known to-date. Out of those, 42 host a neutron star, and for the reminder the nature of a companion is not known. None, so far, is known to host a black hole. There seems to be no apparent mechanism that would prevent formation or detection of Be stars with black holes.
arxiv   +1 more source

Probing the X-ray Variability of X-ray Binaries [PDF]

arXiv, 2003
Kilohertz quasi-periodic oscillations (kHz QPOs) has been regarded as representing the Keplerian frequency at the inner disk edge in the neutron star X-ray binaries. The so-called ``parallel tracks'' on the plot of the kHz QPO frequency vs. X-ray flux in neutron star X-ray binaries, on the other hand, show the correlation between the kHz QPO frequency ...
arxiv  

Upper Limits on the X-ray Emission of "Uranium" Stars [PDF]

, 2003
A paper by Qian & Wasserburg suggests the optical absorption lines of uranium observed in the spectra of ultra-metal-poor stars (defined as [Fe/H] $<$-3) arise from contamination from a supernova in a binary star system. Assuming the binary survived the explosion, a collapsed compact object may be present and implying potential accretion processes with
arxiv   +1 more source

OAO1657-415 : A `Missing Link' in High Mass X-ray Binaries? [PDF]

arXiv, 2000
OAO1657-415 is only the seventh eclipsing X-ray pulsar known and therefore has the potential to yield only the seventh mass of a neutron star in an X-ray binary. Here we report photometric and spectroscopic observations of candidates for the optical counterpart to the system and identify a B6V or B5III star as a possible companion to the neutron star ...
arxiv  

Discovery of the first accretion-powered millisecond X-ray pulsar [PDF]

arXiv, 1998
The precise origins of the millisecond radio pulsars, discovered in the early 1980s, remain uncertain until this day. They plausibly evolve from accreting low magnetic-field neutron stars in X-ray binary systems. If so, these stars should spin at millisecond rates.
arxiv