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Absolute parameters and period variation in a semidetached eclipsing variable V2247 Cyg
Volkov, I. M.; Ikonnikova, N. P.; Burlak, M. A.
We aim to determine the absolute parameters of the components of a poorly studied Algol-type eclipsing binary V2247 Cyg. The data analysis is based on our numerous precise UBVRcIc photometric observations and low resolution spectra. The photometric solution reveals a semi-detached configuration with a less-massive component filling its Roche lobe.…
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 NIV 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…
Rotational properties of magnetic chemically peculiar stars
Paunzen, E.; Bernhard, K.; Hümmerich, S. +1 more
The magnetic chemically peculiar (mCP) stars of the upper main sequence exhibit strong and globally organized magnetic fields that are inclined to the rotational axis and facilitate the development of surface abundance inhomogeneities resulting in photometric and spectroscopic variability. Photometric time series data are much easier to obtain tha…