Properties of He-rich stars. II. CNO abundances and projected rotational velocities

Details Properties of He-rich stars. II. CNO abundances and projected rotational velocities Properties of He-rich stars. II. CNO abundances and projected rotational velocities

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345..244z&link_type=abstract

Astronomy and Astrophysics, v.345, p.244-248 (1999)

Astronomy and Astrophysics

Astrophysics

10

Stars: Abundances, Stars: Chemically Peculiar

Scientific paper

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 vsin i > 130 km s(-1) . Based on observations collected at the European Southern Observatory, La Silla, Chile (programmes 7-043 and 7-010 of periods 49 and 50 resp.)

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