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Astron. Astrophys. 356, 517-528 (2000)

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Blue stragglers in open clusters

Part II *

S.M. Andrievsky 1,2, D. Schönberner 1 and J.S. Drilling 3

1 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany (DeSchoenberner@aip.de)
2 Odessa State University, Department of Astronomy, Shevchenko Park, 270014 Odessa, Ukraine (scan@deneb.odessa.ua)
3 Louisiana State University, Department of Physics and Astronomy, Baton Rouge, Louisiana 70803, USA (Drilling@baton.phys.lsu.edu)

Received 11 June 1999 / Accepted 8 December 1999

Abstract

We present the results of a spectroscopic study of blue straggler and main sequence B and A - type stars in the open clusters NGC 3496, NGC 6475, NGC 6633 and IC 2602. A detailed analysis based on Kurucz's atmosphere models showed that the main sequence stars rotate rather rapidly and differ from a normal (solar) metallicity for only a few light elements. The blue stragglers have significantly smaller projected rotational velocities. As a group, they show the same chemical peculiarities as ordinary cluster and galactic field stars of the same spectral type. Two blue stragglers and one main sequence star possess a rather low helium content. All investigated stars for which the carbon abundance could be measured showed a moderate-to-strong deficiency of this element. The phenomenon of the blue stragglers is briefly discussed on the basis of our study.

Key words: stars: blue stragglers – stars: abundances

* Based on observations collected at European Southern Observatory.

Send offprint requests to: S. Andrievsky

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© European Southern Observatory (ESO) 2000

Online publication: April 10, 2000
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