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Astron. Astrophys. 338, 85-90 (1998)

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Rotational velocities of B-type stars from the Edinburgh-Cape survey

H.R.M. Magee 1, P.L. Dufton 1, F.P. Keenan 1, W.R.J. Rolleston 1, D. Kilkenny 2, D. O'Donoghue 2, C. Koen 2, R.S. Stobie 2 and R.C. Peterson 3

1 Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast, BT7 1NN, Northern Ireland
2 South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
3 University of California Observatories, Lick Observatory, Santa Cruz, CA 95064, USA

Received 16 March 1998 / Accepted 30 June 1998

Abstract

The projected rotational velocity distribution for a sample of 34 high Galactic latitude B-type stars from the Edinburgh-Cape Faint Blue Object Survey is presented to investigate the evolutionary status of the group as a whole. Statistical analyses of the distribution show it to be similar to that expected if the sample contained mainly normal Population I early B-type stars, although a contamination of up to 20[FORMULA] by evolved stars cannot be ruled out. This implies that a large fraction of the sample consists of normal Population I B-type stars similar to those found in the Galactic disk. Possible mechanisms explaining the presence of these stars in the halo are briefly discussed.

Key words: stars: early-type – stars: rotation – stars: formation Galaxy: halo – Galaxy: stellar content

Send offprint requests to: H.Magee, (H.Magee@qub.ac.uk)

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© European Southern Observatory (ESO) 1998

Online publication: September 8, 1998
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