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Astron. Astrophys. 334, 606-608 (1998)
Discovery of p -mode oscillations in the Ap star HD 213637
Peter Martinez 1,
P. Meintjes 2,
S.J. Ratcliff 3 and
C.Engelbrecht 4
1 South African Astronomical Observatory, P.O. Box 9,
Observatory 7935, South Africa (peter@da.saao.ac.za)
2 Physics Department, University of the Orange Free State,
Bloemfontein 9300, South Africa
3 Department of Physics, Middlebury College, Middlebury,
Vermont, VT 05753, USA
4 Department of Physics, University of South Africa, P.O.
Box 392, Pretoria 0003, South Africa
Received 29 December 1997 / Accepted 18 February 1998
Abstract
We announce the discovery of rapid p -mode oscillations in the A (p EuSrCr) star HD 213637. These variations are modulated in amplitude, which is consistent with rotational modulation, multi-mode oscillations or intrinsic mode growth/decay. A frequency analysis reveals that our data may be described by the combination of two oscillations with frequencies of 1411 and 1452 µHz. However, these frequency values suffer from 1 d-1 alias ambiguities, and require confirmation in a more detailed follow-up study.
Key words: stars: chemically
peculiar 
stars: individual:
HD 213637
stars:
oscillations
stars: variables: other
Send offprint requests to: P. Martinez
Contents
- 1. Introduction
- 2. Observations
- 3. Frequency analysis
- 4. Discussion
- References
© European Southern Observatory (ESO) 1998
Online publication: May 15, 1998
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