Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..94...97d&link_type=abstract
Astrophysics and Space Science, Vol. 94, No. 1, p. 97 - 113
Astronomy and Astrophysics
Astrophysics
Delta Scuti Stars:Spectroscopic Binaries, Spectra:Spectroscopic Binaries, Spectroscopic Binaries:Delta Scuti Stars, Spectroscopic Binaries:Spectra
Scientific paper
Three sets of spectra (in all 85 spectra) of the well-known standard and high eccentricity spectroscopic binary star Beta Ari were taken with the Boller and Chivens grating spectrograph applied to the 137 cm reflector of the Merate Astronomical Observatory. The analysis of the radial velocities RV and equivalent widths Wλ of hydrogen and metal lines shows periodic variations similar to those of some 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 RV seem to recall the Schuster effect observed in classical Cepheids. A periastron effect appears from: (1) increased amplitudes of the RV curves, (2) remarkable variations of the average Wλ curves, (3) strong positive asymmetry (blue wing larger than red wing) in the Hγ and Ca II K lines.
di Belgioso A. B.
Fracassini Massimo
Pasinetti Laura E.
Stroppa P.
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