Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..264m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 264-273.
Astronomy and Astrophysics
Astrophysics
161
Abundance, Barium, Binary Stars, Orbital Elements, Radial Velocity, Stellar Evolution, Companion Stars, Ephemerides, Giant Stars, Standard Deviation, Stellar Mass, White Dwarf Stars
Scientific paper
A series of radial velocity observations has been obtained over the last 3 years of a sample of 20 Ba II stars. Seventeen of these (85%) are found to show long-term velocity variations ranging in amplitude from a few to tens of km s-1. Thus it seems likely that all Ba II stars are binary systems. An additional Ba ii star in the open cluster NGC 2420 is also found to have a variable velocity. Orbits for seven Ba II stars indicate low-mass companions, compatible with their being white dwarfs. Separations are large, about 2 AU on average. The peculiar abundances are not explained, but the fact remains that multiplicity must bear a causal relationship to these peculiarities.
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