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Astron. Astrophys. 327, 167-172 (1997)
The RV-variations of ![[FORMULA]](img1.gif)
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 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]](img2.gif)
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
Contents
- 1. Introduction
- 2. Observations and reduction
- 3. Period analysis
- 3.1. Long-term variation
- 3.2. Short-term variation s
- 4. Discussion
- 5. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 1997
Online publication: April 8, 1998
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