Chemical spots and their dynamical evolution on HgMn stars

Details Chemical spots and their dynamical evolution on HgMn stars Chemical spots and their dynamical evolution on HgMn stars

2010-10-18

arxiv.org/abs/1010.3509v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 2 figures, to appear in the proceedings of the IAU Symposium 273 "Physics of Sun and Star Spots", Ventura, California

Scientific paper

Our recent studies of late B-type stars with HgMn peculiarity revealed for the first time the presence of fast dynamical evolution of chemical spots on their surfaces. These observations suggest a hitherto unknown physical process operating in the stars with radiative outer envelopes. Furthermore, we have also discovered existence of magnetic fields on these stars that have up to now been thought to be non-magnetic. Here we will discuss the dynamical spot evolution on HD 11753 and our new results on magnetic fields on AR Aur.

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