Carbon stars associated with oxygen-rich circumstellar envelopes - EU Andromedae, BM Geminorum and V 778 Cygni

Details Carbon stars associated with oxygen-rich circumstellar envelopes - EU Andromedae, BM Geminorum and V 778 Cygni Carbon stars associated with oxygen-rich circumstellar envelopes - EU Andromedae, BM Geminorum and V 778 Cygni

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251...79b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 79-91.

Astronomy and Astrophysics

Astronomy

46

Asymptotic Giant Branch Stars, Binary Stars, Carbon Stars, Oxygen, Stellar Envelopes, Absorption Spectra, Hydroxyl Emission, Infrared Astronomy Satellite, Stellar Evolution, Visible Spectrum

Scientific paper

High signal-to-noise optical spectra are presented of three carbon stars associated with silicate emission, as well as an OH measurement (1665 and 1667 MHz) toward V 778 Cyg and upper limits for the CO (1-0) and (2-1) lines toward EU And and BM Gem. The optical spectra show that EU And is a J-type carbon star, as was previously known for BM Gem and V 778 Cyg. There is evidence that BM Gem and EU And show Tc-99, an s-process element which is considered to be a signature of recent dredge-up. Precise radial velocity measurements were performed for all three stars at a number of epochs. The two having Tc are also the only ones to show evidence of radial velocity variations. These variations are consistent with motion in a binary system. A binary model for these objects is considered in which the oxygen-rich dust ejected before the star became carbon-rich has been trapped in the system by the gravitational influence of a companion. The scenario does not require that both members of the binary be on the AGB.

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