S stars without technetium - The binary star connection

Details S stars without technetium - The binary star connection S stars without technetium - The binary star connection

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1930b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, June 1990, p. 1930-1940. Research supported by the New York Community Trust and

Astronomy and Astrophysics

Astronomy

65

Binary Stars, S Stars, Technetium, Asymptotic Giant Branch Stars, Charge Coupled Devices, Radial Velocity, Red Giant Stars, Stellar Spectra, White Dwarf Stars

Scientific paper

An exploratory survey of non-Mira MS and S star radial velocities and the He I 10830 A triplet are used to test the assertion that S stars without Tc are spectroscopic binaries, probably with white-dwarf companions. It is found that the He I 10830 A triplet is a prominent feature of the spectra of S stars without Tc, but the He I line is undetectable in the spectra of most S stars without Tc. Also, when radial-velocity variations attributable to orbital motion are detected for S stars without Tc, the variations have a higher frequency that that of S stars with Tc. The results suggest that the S stars without Tc are spectroscopic binaries and are probably related to the G and K giant Barium stars.

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