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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: [email protected], [email protected], [email protected]
Hana Marková
Affiliation:
Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic email: [email protected], [email protected], [email protected]
Zdenek Mikulášek
Affiliation:
Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic email: [email protected], [email protected], [email protected]
Theresa Lüftinger
Affiliation:
Institute for Astronomy of the University of Vienna, Vienna, Austria email: [email protected]
David Bohlender
Affiliation:
National Research Council of Canada, Herzberg Institute of Astrophysics, Victoria, Canada email: [email protected]
Juraj Zverko
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovakia email: [email protected], [email protected]
Jozef Žižňovský
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovakia email: [email protected], [email protected]
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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

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