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Spectral investigation of new candidates to lambda Bootis type stars

Published online by Cambridge University Press:  31 January 2003

G. Perrin ,
F. Malbet ,
I. V. Chernyshova ,
S. M. Andrievsky ,
W. W. Weiss ,
E. Paunzen ,
S.A. Korotin ,
Yu. V. Beletsky ,
U. Heiter  and
G. Handler
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I. V. Chernyshova*
Affiliation:
Astronomical Observatory, Odessa National University, T.G. Shevchenko park, Odessa 65014, Ukraine;
S. M. Andrievsky
Affiliation:
Astronomical Observatory, Odessa National University, T.G. Shevchenko park, Odessa 65014, Ukraine;
W. W. Weiss
Affiliation:
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
E. Paunzen
Affiliation:
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
S.A. Korotin
Affiliation:
Astronomical Observatory, Odessa National University, T.G. Shevchenko park, Odessa 65014, Ukraine;
Yu. V. Beletsky
Affiliation:
Astronomical Observatory, Odessa National University, T.G. Shevchenko park, Odessa 65014, Ukraine;
U. Heiter
Affiliation:
Department of Astronomy, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-7215, USA
G. Handler
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
M. Weber
Affiliation:
Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
*
chern_irina@yahoo.com
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Abstract

We made detailed abundance analysis for ultimative test of membership of twenty λ Bootis type stars candidates. Atmosphere parameters, LTE abundances for ten elements (including C and O) and NLTE values for Na were determined. We are able to confirm or establish the membership for nine objects (HD 23258, HD 36726, HD 40588, HD 74911, HD 84123, HD 91130, HD 106223, HD 111604 and HD 290799). Six stars (HD 90821, HD 98772, HD 103483, HD 108765, HD 201184 and HD 261904) can be definitely ruled out as being member of the λ Bootis group whereas no ambiguous decision can be drawn for another five stars (HD 66684, HD 105058, HD 120500, HD 141851 and HD 294253). We also tryed to find apparent spectroscopic binaries which have two solar abundant components mimic one metal-weak star as proposed by Faraggiana & Bonifacio (1999).

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 6: Observing with the VLTI , 2003 , pp. 271
Copyright
© EAS, EDP Sciences, 2003

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