G77-61 - A dwarf carbon star

Details G77-61 - A dwarf carbon star G77-61 - A dwarf carbon star

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..757d&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 15, 1977, p. 757-766.

Astronomy and Astrophysics

Astrophysics

70

Carbon Stars, Dwarf Stars, Stellar Evolution, Stellar Motions, Abundance, Astrometry, Balmer Series, Binary Stars, Line Spectra, Metallic Stars, Parallax, Spectrophotometry, Stellar Envelopes, Stellar Mass Ejection

Scientific paper

Astrometric and photometric data are used to demonstrate that the cool proper-motion star G77-61, previously assumed to be an early M dwarf on the basis of astrometry and (B-V) color, is in fact a carbon star with striking C2 and CH features. An earlier parallax determination is reanalyzed, the previously derived absolute visual magnitude of roughly +9.6 is confirmed, and it is found that space-motion constraints rule out a giant or subgiant luminosity. Scanner spectrophotometry, blue and red image-tube spectra, and photoelectric colors are presented and compared with similar observations of normal carbon stars. Four evolutionary interpretations of G77-61 are considered, viz., the possibilities that the star (1) is gravitationally contracting to the white-dwarf sequence, (2) represents a rare carbon-rich halo population and is on the main sequence, (3) is undergoing a second main-sequence phase following complete mixing of its core and hydrogen envelope as well as extensive mass loss, and (4) has received carbon-rich material from a close binary companion. The binary interpretation is shown to be the most plausible explanation.

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