Analysis of delta Librae including Hipparcos astrometry

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Bakis V., Budding E., Erdem A., Bakış H., Demircan O., Hadrava P.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.370, sa.4, ss.1935-1945, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 370 Sayı: 4
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1111/j.1365-2966.2006.10619.x
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1935-1945
  • Anahtar Kelimeler: binaries : close, stars : individual : delta Lib, ECLIPSING BINARIES, ALGOL SYSTEM, STARS, PHOTOMETRY, EVOLUTION, VELOCITY, CURVES
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

New spectroscopy of the classical Algol system delta 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 similar to 1 M-circle dot.

New spectroscopy of the classical Algol system delta 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 similar to 1 M-circle dot.

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 delta 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 (similar to 4 au), is confirmed.