Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...52..213d&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 52, May 1983, p. 213-236.
Astronomy and Astrophysics
Astrophysics
10
Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Variable Stars, Chromosphere, Roche Limit, Stellar Motions
Scientific paper
Four UPS light curves of TV Cas are presented. An instantaneous period analysis of these curves and previously published data reveal erratic relative period changes of over 10E-6 a year. The secondary minimum appears to be at phase 0.502. Light curve analysis indicates that the cool component fills its Roche lobe and is of spectral type G5-G9IV. Roche lobe overflow is not sufficient to explain the observed secular decrease of the period. Other mechanisms may be found in the chromospheric activity of the cool component. This activity is suggested by the observed small variations in the light curves with a characteristic period of about a year.
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