Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...103..140v&link_type=abstract
Astronomy and Astrophysics, vol. 103, no. 1, Nov. 1981, p. 140-144.
Astronomy and Astrophysics
Astronomy
38
Binary Stars, Stellar Radiation, X Ray Astronomy, X Ray Binaries, X Ray Stars, Color, Optical Properties, Stellar Luminosity
Scientific paper
The absolute magnitudes and colors of low-mass X-ray binaries are shown to be distributed within narrow ranges: MV =1.0 + or - 1.0 (s.d.), (B-V)0 = 0.0 + or - 0.25 (s.d.), and (U-B)0 = -1.0 + or - 0.25 (s.d.). What is more, the distribution of the ratio of optical to X-ray luminosity is fairly narrow (+ or -1.1 mag s.d.). It is proposed that this uniformity in their optical properties is a consequence of a confinement of the X-ray luminosity function of low-mass X-ray binaries to the luminosity range between approximately 10 to the 36th and 10 to the 38th ergs. The average ratio of bolometric optical flux to X-ray flux is determined using bolometric correction factors obtained from IUE observations of Sco X-1 and MXB 1735-44. With this ratio, the thickness of the accretion disks which reprocess incident X rays into optical photons is estimated.
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