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Spectroscopic Binaries Among λ Bootis-type Stars

Published online by Cambridge University Press:  23 April 2012

Ernst Paunzen ,
Luciano Fraga ,
Ulrike Heiter ,
Ilian Kh. Iliev ,
Inga Kamp  and
Olga Pintado
Ernst Paunzen
Affiliation:
Rozhen National Astronomical Observatory, Institute of Astronomy of the Bulgarian Academy of Sciences, P.O. Box 136, BG-4700 Smolyan, Bulgaria email: ernst.paunzen@univie.ac.at Institut für Astronomie der Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria
Luciano Fraga
Affiliation:
Southern Observatory for Astrophysical Research, Casilla 603, La Serena, Chile
Ulrike Heiter
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
Ilian Kh. Iliev
Affiliation:
Rozhen National Astronomical Observatory, Institute of Astronomy of the Bulgarian Academy of Sciences, P.O. Box 136, BG-4700 Smolyan, Bulgaria email: ernst.paunzen@univie.ac.at
Inga Kamp
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, PO Box 9513, 2300 AV Groningen, The Netherlands
Olga Pintado
Affiliation:
Instituto Superior de Correlación Geológica, Av. Perón S/N, Yerba Buena, 4000 Tucumán, Argentina
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Abstract

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The small group of λ Bootis stars comprises late B to early F-type stars, with moderate to extreme (up to a factor 100) surface under-abundances of most Fe-peak elements and solar abundances of lighter elements (C, N, O, and S). The main mechanisms responsible for this phenomenon are atmospheric diffusion, meridional mixing, and accretion of material from their surroundings. Especially spectroscopic binary (SB) systems with λ Bootis-type components are very important to investigate the evolutionary status and accretion process in more details. Because also δ Scuti type pulsation was found for several members, it gives the opportunity to use the tools of astroseismology for further investigations. We present the results of our long term efforts of detailed abundance analysis, orbital parameter estimation and photometric time series analysis for five well investigated SB systems.

Keywords

stars: chemically peculiardelta Scuticircumstellar matterbinaries: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S282: From Interacting Binaries to Exoplanets: Essential Modeling Tools , July 2011 , pp. 333 - 334
Copyright
Copyright © International Astronomical Union 2012

References

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