Observations of modulation and phase displacement of the stellar wind in six red giant spectroscopic binaries

Details Observations of modulation and phase displacement of the stellar wind in six red giant spectroscopic binaries Observations of modulation and phase displacement of the stellar wind in six red giant spectroscopic binaries

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..261r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 261-266.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Spectroscopy, Binary Stars, Red Giant Stars, Stellar Winds, Calcium, Stellar Envelopes, Stellar Orbits, Wind Velocity

Scientific paper

Simultaneous spectroscopic measurements of stellar radial velocities and velocities of circumstellar (CS) Ca II K were obtained for six red giant spectroscopic binaries. For 4 Dra, RR U Min, Eta Gem, and Delta Sge, the CS velocities in Ca II K are found to follow the stellar radial velocity curves with different phase delays and amplitudes. The results reveal locations of the absorbing CS matter in the line of sight of less than 2 stellar radii for 4 Dra and of about 10 solar radii for RR U Min, Eta Gem, and Delta Sge.

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