Publication details

The light variations of HD 37776 as a result of the uneven surface distribution of helium and silicon

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Authors

KRTIČKA Jiří MIKULÁŠEK Zdeněk ZVERKO Juraj ŽIŽŃOVSKÝ Jozef

Year of publication 2007
Type Article in Proceedings
Conference Physics of Magnetic Stars
MU Faculty or unit

Faculty of Science

Citation
Web http://arxiv.org/abs/astro-ph/0703396
Field Astronomy and astrophysics
Keywords stars: chemically peculiar -- stars: early-type -- stars: variables: other -- stars: atmospheres
Description We calculate the uvby light curves of the helium-strong chemically peculiar (CP) star HD 37776. Assuming that the chemical peculiarity influences the monochromatic radiative flux due to mainly the bound-free processes and using the model of the surface distribution of helium and silicon on HD 37776, as derived from spectroscopy, we calculate the emergent fluxes for a series of its rotational phases. We show that it is possible to consistently simulate light curves of a chemically peculiar star and that the basic properties of variability of helium CP stars can be understood in terms of the model of spots with a peculiar chemical composition.
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