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Astron. Astrophys. 350, 852-854 (1999)

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Research Note

A note on Saio's estimate of second-order effects of rotation on stellar oscillation frequencies

J. Christensen-Dalsgaard 1,2 and M.J. Thompson 1,3

1 Teoretisk Astrofysik Center, Danmarks Grundforskningsfond
2 Institut for Fysik og Astronomi, Aarhus Universitet, 8000 Aarhus C, Denmark (jcd@obs.aau.dk)
3 Astronomy Unit, Queen Mary and Westfield College, London E1 4NS, UK (M.J.Thompson@qmw.ac.uk)

Received 9 July 1999 / Accepted 3 August 1999


In many cases, oscillating stars rotate so rapidly that second-order effects must be taken into account in analyses of the oscillation frequencies. Such investigations have commonly been based on results provided by Saio (1981) for a polytropic model. Here we compare those with frequency changes for more realistic models; we point out that a simple correction to Saio's data allows them to be used in the observationally relevant case of comparing models at fixed luminosity and effective temperature.

Key words: stars: oscillations – stars: rotation – methods: data analysis

Send offprint requests to: J. Christensen-Dalsgaard

This article contains no SIMBAD objects.


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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999