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Astron. Astrophys. 327, 167-172 (1997)

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The RV-variations of [FORMULA] Coronae Borealis - a frequency analysis

H. Lehmann 1, G. Scholz 2, G. Hildebrandt 2 and S. Yang * 3

1 Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, Sternwarte 5, D-07778 Tautenburg, Germany
(lehm@tls-tautenburg.de)
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

Abstract

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 variation 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: fl CrB – stars: oscillations – ffi Scu

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

Send offprint requests to: H. Lehmann

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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