A map-based determination of the nature of Beta Delphini

Details A map-based determination of the nature of Beta Delphini A map-based determination of the nature of Beta Delphini

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342.1085g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 1085-1090.

Astronomy and Astrophysics

Astrophysics

6

Binary Stars, Giant Stars, Late Stars, Stellar Evolution, Astrometry, F Stars, Metallicity, Stellar Mass, Stellar Parallax

Scientific paper

The Beta Delphini binary system presents a stringent test of the theory of stellar evolution. Improved parallax and component masses are found for its giant (F5 III and F5 IV) stars. A study of the evolutionary status of the system indicates it to be 1.9 Gyr (1.9 billion years) old and to have a metallicity of approximately 1.5 times that of the Sun. The perturbation due to the 26.6 yr orbital motion is clearly shown in this 2.2 yr study and allows the most precise determination of the relative masses of the component stars to date. The next few months present an unusual opportunity for orbital study as the system passes through periastron. Two of the reference stars are found to have distances of less than 100 parsecs.

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