Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..107s&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 1, Oct. 1977, p. 107-116.
Astronomy and Astrophysics
Astrophysics
16
Astronomical Spectroscopy, Eclipsing Binary Stars, Light Curve, Photoelectric Emission, Stellar Mass, Ubv Spectra, A Stars, Astronomical Photography, Interstellar Extinction, K Lines
Scientific paper
Times of photographic minima of the eclipsing binary in the triple system DL Vir are used to determine the period of the 'long-period orbit'; i.e., the period of the motion of the eclipsing pair and the single G8 III component about their common center of mass. A best value of 2281.5 days is obtained, and the spectroscopic elements of both the eclipsing orbit and the long-period orbit are estimated. UBV photoelectric light curves of the DL Vir system are analyzed, the (B-V) and (U-B) color indices are computed, and component masses of 2.18 and 1.06 solar masses are derived for the eclipsing stars together with a mass of 1.86 solar masses for the G8 III star. Other parameters of the three stars are also given, and their positions on the H-R diagram are plotted. The present age of the system is reported as 1 billion years.
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