Optical studies of transient low-mass X-ray binaries. IV - A 10-hour distortion wave in the quiescent light curve of GS 2000 + 25

Details Optical studies of transient low-mass X-ray binaries. IV - A 10-hour distortion wave in the quiescent light curve of GS 2000 + 25 Optical studies of transient low-mass X-ray binaries. IV - A 10-hour distortion wave in the quiescent light curve of GS 2000 + 25

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..301c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 301-309.

Astronomy and Astrophysics

Astrophysics

28

Astronomical Photometry, Light Curve, Visible Spectrum, X Ray Binaries, Stellar Color, Stellar Mass, Transient Response

Scientific paper

We present new CCD photometric observations of QZ Vul, the optical counterpart of the very soft X-ray transient GS 2000 + 25, obtained during the quiescent state in 1990 and 1991 in the Cousins I and R bands and in a broad band (VR) covering the 4700 7200 A region. Analysis of this data in combination with the 1988 outburst data reveals that a single value of the orbital period, 8.25836 +/- 0.00012 h, accounts for all existing quiescent and outburst decay observations. The quiescent double-wave light curve, whose amplitude and color signature are consistent with what is expected from the ellipsoidal shape of the dwarf G-K type companion, undergoes a sine wave distortion of 0.1 mag peak-to-peak amplitude with a 10.015 +/- 0.002 h period. This distortion wave gives a beat period of 1.96 d with the orbital period, thus reproducing from a given site a specific light curve every other day. Different possible origins for the 10 h distortion wave are discussed. An explanation in terms of a large spotted area on the companion star may account for the observations but implies a large (17 percent) departure from synchronism.

Affiliated with

Also associated with

No associations

Rating

Optical studies of transient low-mass X-ray binaries. IV - A 10-hour distortion wave in the quiescent light curve of GS 2000 + 25 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical studies of transient low-mass X-ray binaries. IV - A 10-hour distortion wave in the quiescent light curve of GS 2000 + 25, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical studies of transient low-mass X-ray binaries. IV - A 10-hour distortion wave in the quiescent light curve of GS 2000 + 25 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1440312