Spectrographic observations of the suspected Delta Scuti variable Beta Ari

Details Spectrographic observations of the suspected Delta Scuti variable Beta Ari Spectrographic observations of the suspected Delta Scuti variable Beta Ari

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..94...97b&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 94, no. 1, July 1983, p. 93-113. Sponsorship: Consiglio Nazionale delle Ri

Astronomy and Astrophysics

Astrophysics

1

Binary Stars, Cepheid Variables, Stellar Spectra, H Lines, K Lines, Radial Velocity, Spectrographs

Scientific paper

Three sets of spectra (85 spectra in all) of the well-known standard and high eccentricity spectroscopic binary star Beta Ari are taken with the Boller and Chivens grating spectrograph (29 and 35 A/mm) applied to a 137-cm reflector. The sets were taken during the periastron passage of November 14-15, 1976, after the periastron passage of October 2-3, 1977, and before the apastron passage of November 23, 1977. An analysis of the radial velocities and equivalent widths of hydrogen and metal lines reveals periodic variations similar to those of certain classical Delta Scuti stars. The variations of the asymmetries of the profiles of H and Ca II K lines, linked to the variations of the radial velocities, are thought to suggest the Schuster effect observed in classical Cepheids. There are three indications of a periastron effect. The first is in the increased amplitudes of the radial velocity curves; the second is in the remarkable variations of the averaged equivalent width curves; and the third is in the strong positive asymmetry (with the blue wing larger than the red wing) in the H-gamma and Ca II K lines.

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