An Astrometric Study of the Binary Star α Ophiuchi

descriptionPublicationkeyboard_double_arrow_right Article 01 Aug 2005 English Publisher:American Astronomical SocietyJournal:The Astronomical Journal, volume 130, pages 809-814 (issn: 0004-6256, eissn: 1538-3881,

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Authors: George Gatewood;

doi: 10.1086/431723

An Astrometric Study of the Binary Star α Ophiuchi

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Abstract

The work reported here combines data from the Multichannel Astrometric Photometer (MAP), the European astrometric satellite, Hipparcos, and infrared speckle observations of the nearby subgiant binary star system α Oph. The A5 IV primary is found to have a mass of 2.84 ± 0.19 M⊙, while the approximately K2 V companion has a mass of 0.78 ± 0.058 M⊙. The distance modulus is 0.834 ± 0.024 mag, yielding an absolute visual magnitude of 1.248 ± 0.025 mag and an absolute K magnitude of the secondary of 4.3 ± 0.2 mag. Tables list the MAP data and an ephemeris that indicates that the next 4 yr are ideal for further interferometry.

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