Absolute visual magnitudes of low-mass X-ray binaries.

Details Absolute visual magnitudes of low-mass X-ray binaries. Absolute visual magnitudes of low-mass X-ray binaries.

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290..133v&link_type=abstract

Astronomy and Astrophysics 290, 133-136 (1994)

Astronomy and Astrophysics

Astrophysics

179

Stars: Binaries: Close, Neutron, Distances, X-Rays: Stars

Scientific paper

We have derived absolute visual magnitudes for 18 low-mass X-ray binaries using various methods (membership of a stellar system with known distance, Eddington luminosity X-ray standard candle, and absolute magnitude of the secondary star). A simple model for the optical emission is presented in which the X rays from the central source are reprocessed in an accretion disk of standard shape; this model implies that the optical luminosity, L_V_, scales with the X-ray luminosity, L_X_, and the outer radius of the accretion disk, R, approximately as L_V_{prop.to}L_X_^1/2^R. The absolute visual magnitudes of active low-mass X-ray binaries are found to range between ~5 and ~-5. This large range is the consequence of the large range in the X-ray luminosity and size of the accretion disk.

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