Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342.1061k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 1061-1067. Research supported by IAU.
Astronomy and Astrophysics
Astrophysics
28
Eclipsing Binary Stars, Light Curve, Visual Photometry, Electrophotometry, Main Sequence Stars, Radii, Roche Limit, Stellar Mass
Scientific paper
The photoelectric light curves of Algol were made with a total of 1034 observations in B and V at Yonsei University Observatory. The two times of minimum light determined are HJD 2,445,263.0296 and HJD 2,445,739.0030. The light curves were analyzed using the Wilson-Devinney method. It was reconfirmed that the secondary component of Algol is filling its Roche lobe. The adjusted photometric mass ratio, q = 0.227 + or - 0.002(p.e.), is in agreement with the spectroscopic mass ratio, q = 0.217 + or - 0.005(m.e.) of Hill et al. (1971) and of Tomkin and Lambert (1978). The luminosities of the third component in B and V are 0.106 + or - 0.009(p.e.) and 0.119 + or - 0.009(p.e.), respectively, where the unit is l1 + l2 + l3 = 1. The spectral type for the third component of Algol was derived as A5 V from the determined temperature T3 = 8500 K and color index B-V = +0.13. The radius of this star has been derived from the ratio of radii and the absolute dimensions of the primary. The radius and mass relation suggest that this component is a main-sequence star. Some evolutionary aspects of Algol have been suggested.
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