The soft X-ray transient GS2000 + 25 – II. An ellipsoidal modulation in quiescence
Open Access
- 1 April 1991
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 249 (3) , 573-576
- https://doi.org/10.1093/mnras/249.3.573
Abstract
We present the results of a photometric study of the optical counterpart of the X-ray transient GS2000 + 25 in quiescence. With a mean R magnitude of ~ 21.2, we present evidence for short-term variability on a time-scale of hours which is consistent with an ellipsoidal modulation of the secondary with a period of 4.1 hr. This indicates an orbital period of ~ 8.2 hr. We compare the properties of GS2000 + 25 with the soft X-ray transient A0620 – 00.Keywords
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