Radial-velocity variations in Alpha Ori, Alpha Sco, and Alpha HER

Details Radial-velocity variations in Alpha Ori, Alpha Sco, and Alpha HER Radial-velocity variations in Alpha Ori, Alpha Sco, and Alpha HER

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2233s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2233-2248.

Astronomy and Astrophysics

Astronomy

37

M Stars, Radial Velocity, Red Giant Stars, Stellar Oscillations, Supergiant Stars, Charge Coupled Devices, Emission Spectra, H Alpha Line, Metallicity, Spectral Line Width, Stellar Rotation

Scientific paper

Radial-velocity observations of Alpha Ori, Alpha Sco A, and Alpha Her A are used to study radial-velocity periodicities in M supergiants. The data refer to several metallic lines in the H-alpha region and to H-alpha itself. It is shown that Alpha Ori and Alpha Sco A have cycle lengths of about 1 yr and semiamplitudes of 2 km/s. It is suggested that many semiregular red supergiant varibles such as Alpha Ori may be heading toward chaos. All three stars show short-term stochastic flucutations with an amplitude of 1-2 km/s. It is found that the long-term variability of H-alpha velocities may be a consequence of intermittent failed ejections.

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