The soft X-ray transient GS2000 + 25. II - an ellipsoidal modulation in quiescence

Details The soft X-ray transient GS2000 + 25. II - an ellipsoidal modulation in quiescence The soft X-ray transient GS2000 + 25. II - an ellipsoidal modulation in quiescence

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..573c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 573-576.

Astronomy and Astrophysics

Astronomy

28

Astronomical Photometry, Stellar Magnitude, Stellar Orbits, X Ray Binaries, Imaging Techniques, Optical Measurement, Power Spectra, Stellar Mass

Scientific paper

The results of a photometric study of the optical counterpart of the X-ray transient GS2000 + 25 in quiescence are presented. With a mean R magnitude of 21.2, evidence is presented 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 about 8.2 hr. The properties of GS2000 + 25 are compared with the soft X-ray transient A0620 - 00.

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