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Astron. Astrophys. 351, 981-984 (1999)

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Research Note

Accurate LTE abundances of seven well established [FORMULA] Bootis stars *

E. Paunzen 1, S.M. Andrievsky 2, I.V. Chernyshova 2, V.G. Klochkova 3, V.E. Panchuk 3 and G. Handler 1,4

1 Institut für Astronomie der Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria (Ernst.Paunzen@univie.ac.at)
2 Department of Astronomy, Odessa State University, Shevchenko Park, 270014, Odessa, Ukraine
3 Special Astronomical Observatory, Russian Academy of Sciences, Nizhny Arkhyz, Russia
4 South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa

Received 4 May 1999 / Accepted 30 September 1999

Abstract

High resolution and high signal-to-noise CCD spectra were analyzed to determine accurate LTE abundances for seven well established [FORMULA] Bootis stars (a group of A to F-type stars with strong underabundances of Fe-peak elements whereas the C, N, O and S appear to be solar abundant): HD 31295, HD 125162, HD 142994, HD 149303, HD 192640, HD 204041 and HD 221756. In general, 13 elements were investigated. The effective temperatures of our program stars range from 7200 to 9000 K.

The main results are the following: C, O, Na and S seem to be nearly solar abundant for all investigated stars. A wide range of underabundances within the individual stars exists for all other elements.

No correlation of the individual abundances with astrophysical parameters such as [FORMULA], log g and v sin i was found.

These results are consistent with the accretion/diffusion model which is currently adopted for the explanation of the [FORMULA] Bootis phenomenon.

Key words: stars: abundances – stars: atmospheres – stars: chemically peculiar – stars: early-type

* Based on observations from the Special Astrophysical Observatory of the Russian Academy of Sciences, Russia, Northern Caucasus and the McDonald Observatory

Send offprint requests to: E. Paunzen

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© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999
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