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On the nature of the dwarf carbon star G77-61
Dearborn, D. S. P.; Liebert, James; Aaronson, Marc; Dahn, Conard C.; Harrington, Robert; Mould, Jeremy; Greenstein, Jesse L.
AA(Steward Observatory, Tucson, AZ), AB(Steward Observatory, Tucson, AZ), AC(Steward Observatory, Tucson, AZ), AD(U.S. Naval Observatory, Flagstaff, AZ), AE(U.S. Naval Observatory, Flagstaff, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 314-324. (ApJ Homepage)
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NASA/STI Keywords:
Binary Stars, Carbon Stars, Dwarf Stars, Stellar Composition, Stellar Evolution, Stellar Spectrophotometry, Astrometry, Cool Stars, Hertzsprung-Russell Diagram, Radial Velocity, Spectral Energy Distribution, Stellar Mass Accretion, Stellar Motions
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A variety of new astrometric, photometric, and spectrophotometric data are presented for the low-luminosity carbon star G77-61. The improved parallax yields Mv = +10.08±0.43, while the revised temperature estimate from infrared, optical, and ultraviolet fluxes in 4100 (+200, -300)K, yielding logL/L_sun; = -1.75±0.16. Most importantly, radial velocity variations have been detected, with the binary period 245 days. The unseen companion probably is a cool white dwarf of much higher mass than the visible object. Both the spectrum and the H-R diagram position below the main sequence require G77-61 to be either extremely metal poor, or helium enriched and at least moderately metal poor.

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