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The nature of the light variations of chemically peculiar stars CU Vir and HD 64740

Published online by Cambridge University Press:  12 July 2011

Jiri Krtička ,
Hana Marková ,
Zdenek Mikulášek ,
Theresa Lüftinger ,
David Bohlender ,
Juraj Zverko  and
Jozef Žižňovský
Jiri Krtička
Affiliation:
Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic email: krticka@physics.muni.cz, 175960@mail.muni.cz, mikulas@physics.muni.cz
Hana Marková
Affiliation:
Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic email: krticka@physics.muni.cz, 175960@mail.muni.cz, mikulas@physics.muni.cz
Zdenek Mikulášek
Affiliation:
Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic email: krticka@physics.muni.cz, 175960@mail.muni.cz, mikulas@physics.muni.cz
Theresa Lüftinger
Affiliation:
Institute for Astronomy of the University of Vienna, Vienna, Austria email: lueftinger@astro.univie.ac.at
David Bohlender
Affiliation:
National Research Council of Canada, Herzberg Institute of Astrophysics, Victoria, Canada email: david.bohlender@nrc-cnrc.gc.ca
Juraj Zverko
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovakia email: zve@ta3.sk, ziga@ta3.sk
Jozef Žižňovský
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovakia email: zve@ta3.sk, ziga@ta3.sk
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Abstract

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The nature of the light variations of chemically peculiar stars was studied in detail only in a very few cases. To better understand the mechanisms of light variability of these stars, we study the light variations of the well-known magnetic chemically peculiar star CU Vir and one of the least amplitude variable stars HD 64740. We show that the light variability of these stars is induced by flux redistribution in spots of enhanced abundance of chemical elements (e.g., helium, silicon, iron or chromium), and by the stellar rotation. We conclude that this is a promising model for the explanation of the light variability of most chemically peculiar stars.

Keywords

stars: atmospheresstars: chemically peculiarstars: spotsstars: variables: other
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 517 - 518
Copyright
Copyright © International Astronomical Union 2011

References

Bohlender, D. A. & Landstreet, J. D. 1990, ApJ, 358, 274CrossRefGoogle Scholar
Hubeny, I. & Lanz, T. 1995, ApJ, 439, 875CrossRefGoogle Scholar
Kuschnig, R., Ryabchikova, T. A., Piskunov, N. E., & Weiss, W. W. et al. 1999, A&A, 348, 924Google Scholar
Krtička, J., Mikuláček, Z., Zverko, J. & Žižńovský, J. 2007, A&A, 470, 1089Google Scholar
Krtička, J., Mikulášek, Z., Henry, G. W., & Zverko, J. et al. 2009, A&A, 499, 567Google Scholar
Lanz, T. & Hubeny, I. 2007, ApJS, 169, 83CrossRefGoogle Scholar
Perryman, M.A.C. & ESA 1997, The Hipparcos and Tycho Catalogues, ESA-SP 1200 (Noordwijk, Netherlands: ESA Publications Division)Google Scholar
Pyper, D. M. & Adelman, S. J. 1985, A&AS, 59, 369Google Scholar