Light curve and period variations of a W Ursae Majoris system LS Delphini

Details Light curve and period variations of a W Ursae Majoris system LS Delphini Light curve and period variations of a W Ursae Majoris system LS Delphini

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...90..301d&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 90, no. 2, Oct. 1991, p. 301-309.

Astronomy and Astrophysics

Astrophysics

3

Eclipsing Binary Stars, Light Curve, Periodic Variations, Astronomical Photometry, Mass Transfer, Stellar Activity, Stellar Models, Ubv Spectra

Scientific paper

Differential UBV observations, carried out between 1987 and 1989, of a small amplitude W UMa system LS Del=HD 199497 are presented. Light curves and photometric periods of the system are found strongly variable from cycle to cycle. Wavelength-dependent light variations indicate that the system is in a very active phase. It was found, by Fourier analysis, that the light variation is dominated by an ellipticity effect but, that about 20 percent of the variation in B band is due to 'reflection'. By comparing the light curves, evidence was also found that the apparently large 'reflection' effect may be induced by a variable emission from a hot region in the neck of the system.

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