X-Ray Binaries and Compact Objects
نویسندگان
چکیده
منابع مشابه
Ultra-compact (X-ray) binaries
A short review of ultra-compact binaries, focused on ultra-compact X-ray binaries, is followed by a discussion of recent results of our VLT campaign to obtain optical spectra of (candidate) ultra-compact X-ray binaries. We find evidence for carbon/oxygen as well as helium/nitrogen discs and no evidence for (traces) of hydrogen. This suggests that the donors in the observed systems are white dwa...
متن کاملForty Years of X-Ray Binaries
In 2012 it was forty years ago that the discovery of the first X-ray binary Centaurus X-3 became known. That same year it was discovered that apart from the High-Mass X-ray Binaries (HMXBs) there are also Low-Mass X-ray Binaries (LMXBs), and that Cygnus X-1 is most probably a black hole. By 1975 also the new class of Be/X-ray binaries was discovered. After this it took 28 years before ESAs INTE...
متن کاملTwo new candidate ultra-compact X-ray binaries
We present the identification of the optical counterparts to the low-mass X-ray binaries 1A 1246−588 and 4U 1812−12. We determine the X-ray position of 1A 1246−588 from ROSAT /PSPC observations and find within the error circle a blue star with V = 19.45, B − V = 0.22 and R − I = 0.22 which we identify as the counterpart. Within the Chandra error circle of 4U 1812−12, a single star is present wh...
متن کاملOptical spectroscopy of (candidate) ultra-compact X-ray binaries
We present (preliminary) results of our systematic spectroscopic study of (candidate) ultra-compact X-ray binaries. Most candidates are confirmed and we found the first optical spectra of (pure) carbon-oxygen accretion discs.
متن کاملHydrogen-Poor Disks in Compact X-Ray Binaries
We show that accretion disks in several compact X-ray binaries with hydrogen– depleted donors are likely subject to a thermal ionization instability, unless they are strongly irradiated. These disks are particularly interesting in that their MHDturbulent properties in the neutral phase may be quite different from those of standard, hydrogen–rich disks. subject headings: X-ray: stars – accretion...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1977
ISSN: 1539-2996
DOI: 10.1017/s1539299600002392