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The nature of light variations in magnetic hot stars

Niemczura, E.; Huang, L.; Krtička, J. +6 more

Magnetic stars show several types of light variability which is modulated by the stellar rotation. In chemically peculiar stars, the redistribution of the flux in the surface regions with peculiar chemical composition leads to the light variability with a typical amplitude of the order of hundredths of magnitude. The most efficient processes that …

Multiple, short-lived "stellar prominences" on the O giant ξ Persei: a magnetic star?

Henrichs, H. F.; Sudnik, N.

We present strong evidence for a rotation period of 2.0406 d of the O giant ξ Persei, derived from the N_IV λ1718 wind line in 12 yr of IUE data. We predict that ξ Per has a magnetic dipole field, with superposed variable magnetic prominences. Favorable dates for future magnetic measurements can be predicted. We also analysed time-resolv…