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Astron. Astrophys. 334, 606-608 (1998)

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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

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998

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