ForumSpringerAstron. Astrophys.
ForumWhats NewSearchOrders

Astron. Astrophys. 327, 167-172

Table of Contents
Available formats: HTML | PDF | (gzipped) PostScript

The RV-variations of Coronae Borealis a frequency analysis

H. Lehmann1, G. Scholz2, G. Hildebrandt2, and S. Yang3*

1 Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, Sternwarte 5, D-07778 Tautenburg, Germany
2 Astrophysikalisches Institut Potsdam, Telegrafenberg A 27, D-14473 Potsdam, Germany (gscholz; ghildebrandt@aip.de)
3 Dept. of Physics & Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC, Canada V8W 3P6 (yang@uvastro.phys.uvic.ca)

Received 21 April 1997 / Accepted 26 May 1997


We summarize a longer campaign of spectroscopic observations of the suspected Maia variable star FORMULA CrB. Previously published data are complemented by two-longitudinal observations. We investigate 1262 CCD spectra for short-term radial velocity s. Results show that A0 stars can pulsate with periods quite similar to those of the well-known FORMULA Scu stars. From a frequency analysis of the data we can derive at least three periods with significant contributions to a multiple frequency model. The probable rotational period of the star is in the order of 0.9 d, and the observed short-term periods are arranged in a triplet around 0.1 d. The observed relation of the frequencies points to the occurrence of rotationally split non-radial pulsations.

Key words: stars: early-type - stars: individual: FORMULA CrB- stars: oscillations - FORMULA Scu

*Guest investigator, Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada

Send offprint requests to: H. Lehmann

© European Southern Observatory (ESO) 1997

Online publication: October 1, 1997
Last change: April 8, 1998