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1 2009

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Rotation of δ Scuti Stars in the Open Clusters NGC 1817 and NGC 7062

Molenda-Żakowicz J., Arentoft T., Frandsen S., Grundahl F.

Acta Astronomica

2009

Vol. 59, No. 1

69--88

We report results of spectroscopic and photometric observations of ten δ Sct stars and one eclipsing binary in the open cluster NGC 1817, and of ten δ Sct stars and two other variables in the open cluster NGC 7062. For all targets in NGC 1817 and for three targets in NGC 7062 the radial velocity and projected rotational velocity are determined. For all stars the effective temperature and surface gravity is measured. Two δ Sct stars, NGC 1817 -V1 and NGC 7062 -V1, and the eclipsing binary, NGC 1817 -V18, are discovered to be single-lined spectroscopic binaries. The eclipsing binary δ Sct star NGC 1817 -V4 is discovered to be a double-lined spectroscopic binary. All δ Sct stars which we observed spectroscopically are found to be moderate or fast rotators.