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Tracing the Transient Periods in the Be Star 28 ω CMa

Published online by Cambridge University Press:  12 April 2016

S. Štefl ,
A. Budovičová ,
D. Baade ,
A. Kaufer ,
T. Rivinius ,
O. Stahl  and
B. Wolf
S. Štefl
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic
A. Budovičová
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic
D. Baade
Affiliation:
European Southern Observatory, Garching, Germany
A. Kaufer
Affiliation:
European Southern Observatory, Garching, Germany
T. Rivinius
Affiliation:
Landessternwarte Königstuhl, Heidelberg, Germany
O. Stahl
Affiliation:
Landessternwarte Königstuhl, Heidelberg, Germany
B. Wolf
Affiliation:
Landessternwarte Königstuhl, Heidelberg, Germany

Abstract

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Spectra of the Be star 28 CMa obtained with the HEROS echelle spectrograph in 1996 and 1997 were used to check the presence of transient periods in commonly measured scalar parameters of absorption and emission lines. Transient periods can be convincingly detected in modes of higher absorption and single peak emission lines of the Balmer series as well as in the V/R ratio of Fell lines. Consequences for the frequency analyses of datasets containing radial velocities derived from different ions are discussed. The significant differences in amplitudes of radial velocities of different ions and in individual seasons were confirmed and a mean ephemeris derived.

Type
3. Periodic Variations
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 240 - 243
Copyright
Copyright © Astronomical Society of the Pacific 2000

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