Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.370.1935b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 370, Issue 4, pp. 1935-1945.
Astronomy and Astrophysics
Astronomy
9
Binaries: Close: Stars: Individual: Δ Lib, Binaries: Close, Stars: Individual: Δ Lib
Scientific paper
New spectroscopy of the classical Algol system δ Lib, combined with high-quality optical and infrared photometry, provides the basis for a good understanding of the close binary system's main parameters. Detailed analysis of the photometry reveals the significant role of a third light source, pointing to the existence of a companion to the eclipsing system of mass ~1Msolar.
We review the methodology of applying high-accuracy positional information, available from the Hipparcos Intermediate Astrometric Data archive, to stars that may have such companions. Analysis of the astrometry of δ Lib also points to a third star similar to the one already identified by Worek from radial-velocity data, although with slightly revised parameters. O-C data do not contradict this, but their general precision (while confirming the close pair's Algol status) fails to allow a decision on the third orbit parameters: Worek's or revised ones. Taking the photometry, spectroscopy and astrometry together, however, the existence of a third star of comparable mass to the Sun, as a relatively close companion to the eclipsing binary (~4 au), is confirmed.
Bakis Hicran
Bakis Volkan
Budding Edwin
Demircan Osman
Erdem Ahmet
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