Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..608t&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, Apr. 15, 1978, p. 608-615.
Astronomy and Astrophysics
Astrophysics
24
Eclipsing Binary Stars, Radial Velocity, Stellar Spectra, Variable Stars, Abundance, Algol, Infrared Spectra, Light Curve, Line Spectra, Periodic Variations
Scientific paper
The secondary Ca II infrared triplet lines of the Algol-type eclipsing binary Delta Lib have been detected both during and outside of primary eclipse. Well-defined velocity curves for the primary and secondary are obtained. A primary/secondary mass ratio of 2.9 + or - 0.1 and primary and secondary masses of 4.9 + or - 0.2 and 1.7 + or - 0.2 solar masses are derived. With a main-sequence primary and an evolved, less massive secondary that fills its Roche lobe, Delta Lib is an example of an Algol system that has undergone an episode of large-scale mass transfer. The evidence for a third member of the system is discussed and found to be unconvincing.
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