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2006MNRAS.370.1935B - Mon. Not. R. Astron. Soc., 370, 1935-1945 (2006/August-3)
Analysis of δ Librae including Hipparcos astrometry.
BAKIS V., BUDDING E., ERDEM A., BAKIS H., DEMIRCAN O. and HADRAVA P.
Abstract (from CDS):
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.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): binaries: close - stars: individual: δ Lib
Simbad objects: 8
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