On the outburst amplitude of the soft X-ray transients

Details On the outburst amplitude of the soft X-ray transients On the outburst amplitude of the soft X-ray transients

1997-10-10

arxiv.org/abs/astro-ph/9710105v1

Astronomy and Astrophysics

Astrophysics

5 pages Latex, 1 figure, to appear in MNRAS as a letter

Scientific paper

We find a strong correlation between the optical outburst amplitude Delta V and orbital period P_{orb} for the soft X-ray transient sources with orbital periods less than 1 day. By fitting the observed values for 8 X-ray transients we determine an empirical relation that can be used to predict the orbital period of an X-ray transient given only its outburst amplitude: \Delta V= 14.36 - 7.63\log P_{orb}(h). For periods less than 12 hrs we determine a relation for the absolute magnitude of the accretion disc during outburst, which then allows us to estimate the distances to the sources.

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