Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-15
Astronomy and Astrophysics
Astrophysics
11 pages, accepted for the publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20066627
We simulate light curves of the helium strong chemically peculiar star HD 37776 assuming that the observed periodic light variations originate as a result of inhomogeneous horizontal distribution of chemical elements on the surface of a rotating star. We show that chemical peculiarity influences the monochromatic radiative flux, mainly due to bound-free processes. Using the model of the distribution of silicon and helium on HD 37776 surface, derived from spectroscopy, we calculate a photometric map of the surface and consequently the uvby light curves of this star. Basically, the predicted light curves agree in shape and amplitude with the observed ones. We conclude that the basic properties of variability of this helium strong chemically peculiar star can be understood in terms of the model of spots with peculiar chemical composition.
Krticka Jiri
Mikulasek Zdenek
Ziznovsky Josef
Zverko Juraj
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