Color variability and optical light curve of 2S0921-630

Details Color variability and optical light curve of 2S0921-630 Color variability and optical light curve of 2S0921-630

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112...68c&link_type=abstract

Astronomy and Astrophysics, vol. 112, no. 1, Aug. 1982, p. 68-72. Research supported by the Centre National de la Recherche Sci

Astronomy and Astrophysics

Astrophysics

17

Eclipsing Binary Stars, Light Curve, Stellar Color, Ubv Spectra, X Ray Sources, Mass Transfer, Periodic Variations, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

Analysis of optical photometry of the 2S0921-630 X-ray source counterpart obtained in 1979, 1980, and 1981 at ESO shows that the U-B index is modulated with a 9-d period, this being also the recurrence period of the magnitude-deep eclipses, thus confirming the 8.99-d spectroscopic period of Cowley et al. (1981) and Thorstensen and Charles (1981). Most of the light in this system comes from a luminous accretion disk, overwhelming the contribution from the companion, which becomes detectable only during the eclipses. The eclipses last 0.2 P and start 0.1 P after the time of maximum recession velocity of the He II 4686 emission line originating in the disk (Cowley et al.), which is also the time of reddest U-B. We interpret the eclipses as due to partial occultation of the disk by a late-type companion and by a stream. The U-B modulation is closely correlated with the intensity modulation of the emission lines, suggesting an origin in a Balmer continuum emission region whose visibility varies in the course of an orbital cycle. This could be due to the changing aspect of an X-ray illuminated bulge.

Affiliated with

Also associated with

No associations

Rating

Color variability and optical light curve of 2S0921-630 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 Color variability and optical light curve of 2S0921-630, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color variability and optical light curve of 2S0921-630 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-899171