Magnetic Chemically Peculiar stars With Unsteady Periods

Název česky Magnetické chemicky pekuliární hvězdy s nestabilními periodami.
Autoři MIKULÁŠEK Zdeněk KRTIČKA Jiří JANÍK Jan — ZVĚŘINA Pavel — ZVERKO Juraj — ŽIŽNOVSKÝ Jozef — ZEJDA Miloslav
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Citace MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Jan JANÍK, Pavel ZVĚŘINA, Juraj ZVERKO, Jozef ŽIŽNOVSKÝ a Miloslav ZEJDA. Magnetic Chemically Peculiar stars With Unsteady Periods. In I. I. Romanyuk, D. O. Kudryavtsev. Magnetic Stars. Proceedings of the International Conference, held in the Special Astrophysical Observatory of the Russian AS. Moskva: Special Astrophysical Observatory of the Russian AS, 2011. s. 52-60, 9 s. ISBN 978-5-7422-3156-1.
Originální jazyk angličtina
Obor Astronomie a nebeská mechanika, astrofyzika
Klíčová slova magnetic stars; CP stars; rotation

Photometrically and spectroscopically variable chemically peculiar (CP) stars are the optimum laboratories for testing the rotational evolution of main sequence stars. A vast majority of well-studied CP stars have quite steady rotational periods (e. g. SrCrEu star CQ UMa). However, there are several CP stars that exhibit apparent period variations. The origin of the period variations is unclear in many cases. We describe the observed period variations of several individual CP stars, especially V901 Ori, sigma Ori E, HR 7355, CU Vir, SX Ari, and EE Dra. The CP stars with unsteady periods now represent a very diverse group with dissimilar O-C diagrams and time scales. We also discuss the causes of the period changes found and a possible cyclicity or chaoticity of them.

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