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Astron. Astrophys. 345, 244-248 (1999)

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Properties of He-rich stars

II. CNO abundances and projected rotational velocities *

M. Zboril 1,2 and P. North 3

1 Armagh Observatory, Armagh, College Hill, BT61 9DG, Ireland
2 Astronomical Institute, Tatranská Lomnica, 05960, Slovakia
3 Institut d'Astronomie de l'Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland

Received 26 January 1998 / Accepted 4 February 1999

Abstract

We present an abundance analysis of light elements in the most massive chemically peculiar (CP) stars, He-rich stars. The analysis is based on both low and high-resolution observations collected at ESO, La Silla, Chile in the optical region and includes 6 standard and 21 He-rich stars. Light element abundances display a diverse pattern from under-solar up to above-solar values. Carbon is found underabundant in the hottest He-rich stars and normal in the coolest ones, according to the LTE model predictions. The distribution of projected rotational velocities shows a significant excess of slow rotators, no He-rich stars having [FORMULA] 130 km s-1.

Key words: stars: abundances – stars: chemically peculiar

* Based on observations collected at the European Southern Observatory, La Silla, Chile (programmes 7-043 and 7-010 of periods 49 and 50 resp.)

Send offprint requests to: M. Zboril

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© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999
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