Spectroscopic Analysis of Subluminous B Stars in Binaries - Four Candidate Systems with Neutron Star/Black Hole Companions Discovered
msra(2006)
摘要
The masses of compact objects like white dwarfs, neutron stars and black
holes are fundamental to astrophysics, but very difficult to measure. We
present the results of an analysis of subluminous B (sdB) stars in close binary
systems with unseen compact companions to derive their masses and clarify their
nature. Radial velocity curves were obtained from time resolved spectroscopy.
The atmospheric parameters were determined in a quantitative spectral analysis.
With high resolution spectra we were able to measure the projected rotational
velocity of the stars with high accuracy. The assumption of orbital
synchronization made it possible to constrain inclination angle and companion
mass of the binaries. Five invisible companions have masses that are compatible
with white dwarfs or late type main sequence stars. But four sdBs have very
massive companions like heavy white dwarfs, neutron stars or even black holes.
Such a high fraction of massive compact companions can not be explained with
current models of binary evolution.
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关键词
high resolution,main sequence,black hole,radial velocity,white dwarf,neutron star,compact object
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