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Title: Radial-velocity variations in Alpha Ori, Alpha Sco, and Alpha Her

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. 58 refs.
Authors:
; ;  [1]
  1. (National Solar Observatory, Tucson, AZ (USA) Computer Sciences Corp., Seabrook, MD (USA) Iowa State Univ., Ames (USA))
Publication Date:
OSTI Identifier:
6967206
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal; (USA); Journal Volume: 98
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SUPERGIANT STARS; RADIAL VELOCITY; BALMER LINES; CHARGE-COUPLED DEVICES; CHEMICAL COMPOSITION; EMISSION SPECTRA; LINE WIDTHS; OSCILLATIONS; RED GIANT STARS; ROTATION; GIANT STARS; MOTION; SEMICONDUCTOR DEVICES; SPECTRA; STARS; VELOCITY 640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar, Radio & X-Ray Sources