Other
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..424c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 1, 1990, p. 424-430.
Other
25
Eclipsing Binary Stars, Light Curve, Stellar Orbits, X Ray Binaries, Astronomical Models, Exosat Satellite, F Stars, G Stars, Main Sequence Stars, Stellar Flares
Scientific paper
An Exosat observation of one orbital cycle of the eclipsing 3.2-d RS CVn system TY Pyx is reported. This system contains two almost identical GV stars, which is unusual because most RS CVns contain F or G main-sequence star and a K subgiant. The X-ray light curves of the primary and secondary eclipses are different above and below 1 keV. At lower energies a sharp eclipse is seen, but at higher energies it is absent. This confirms earlier observations that the 1.5-4.0 x 10 to the 7th K emission from the RS CVn systems is not eclipsed and comes from an extended region, whereas the 7 x 10 to the 6th K emission comes from more compact solarlike active regions. Modeling the X-ray eclipse detected at low energies requires two emission regions, one on each star, covering less than 20 percent of the stellar surface. To avoid a strong orbital modulation caused by both regions being either simultaneously visible, or not visible, they must be located 180 deg apart in longitude. The derived longitudes are 0 and 180 deg; i.e., they point at each other on the inward faces of the two stars.
Culhane Leonard J.
Parmar Arvind N.
Shafer Richard A.
White Nicholas E.
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