The binary system Sigma 2173

Details The binary system Sigma 2173 The binary system Sigma 2173

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..294b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, March 1991, p. 294-299.

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6

Astronomical Spectroscopy, Binary Stars, High Dispersion Spectrographs, Stellar Evolution, Stellar Mass, Astronomical Photography, Orbital Elements, Stellar Luminosity, Stellar Orbits, Stellar Parallax, Stellar Spectra

Scientific paper

A complete determination is made of the orbital elements of the visual binary Sigma 2173, by combining new high-dispersion spectroscopic observations with others obtained during passage through the opposite node and with visual and interferometric observations. While the derived parallax of 0.059 arcsec implies masses and luminosities for the components that are in good agreement with spectral types and luminosity classes, they are noted to be problematic from the standpoint of extant theoretical studies of stellar evolution. The two stars of this system are so similar that no difference is distinguishable in spectral type; the brighter of the two stars appears, however, to be the less massive.

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