SIMBAD references

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):

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 ∼1M.

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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2022.10.07-01:48:56

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