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

Citations Over Time

Abstract

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.

Related Papers

• → Radial-velocity variations in Alpha Ori, Alpha Sco, and Alpha HER(1989)60 cited
• → Erratum to “Alpha-decay half-lives, alpha-capture and alpha-nucleus potential” [Atomic Data and Nuclear Data Tables 95 (2009) 815–835](2010)6 cited
• → Antisymmetrisation in alpha decay and alpha transfer(1978)18 cited
• A comparison of emission lines in the ultraviolet spectra of Alpha Boo /K2IIIp/, Alpha Tau /K5III/, Alpha Ori /M1-2Ia-b/ and Alpha Sco /M1.5Iab+B2.5V/(1979)
• → Parent lines of X-ray high-frequency satellites(1970)3 cited