Radial velocity monitoring of a sample of barium and S stars using CORAVEL - Towards an evolutionary link between barium and S stars?

Details Radial velocity monitoring of a sample of barium and S stars using CORAVEL - Towards an evolutionary link between barium and S stars? Radial velocity monitoring of a sample of barium and S stars using CORAVEL - Towards an evolutionary link between barium and S stars?

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..187j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 187-199. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

72

Barium, Binary Stars, Radial Velocity, Red Giant Stars, S Stars, Stellar Evolution, Stellar Mass Accretion, Velocity Distribution

Scientific paper

A sample of 27 southern Ba II and 9 northern S stars has been observed with the radial velocity spectrometer CORAVEL during three seasons. A high proportion (≈89%) of stars with variable radial velocities has been found in both samples. Concernig Ba II stars, there is no doubt about the orbital origin of the observed radial velocity variations. A least 5 S stars show velocity variations originating in orbital motions, while Mira-type pulsations of small amplitude cannot be firmly excluded for 3 more S stars displaying velocity variations with dispersions in the interval 1.0 - 1.5 km s-1. The observations provide additional support to the Ba II-S evolutionary scheme, although a review of other observational data shows that it is probably not possible to totally rule out the currently proposed M-S-C sequence. A binary scenario involving mass transfer and accounting for this dual origin of S stars is proposed.

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