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@inproceedings{1230064,
author = {Mikulášek, Zdeněk and Krtička, Jiří and Janík, Jaroslav and Zejda, Miloslav and Henry, Gregory and Paunzen, Ernst and Žižnovský, Jozef and Zverko, Juraj},
address = {Moskva, Rusko},
booktitle = {Putting A Stars into Context: Evolution, Environment, and Related Stars},
editor = {G. Mathys, E. Griffin, O. Kochukhov, R. Monier, G. Wahlgren},
keywords = {stars:peculiar; stars},
howpublished = {tištěná verze "print"},
language = {eng},
location = {Moskva, Rusko},
isbn = {978-5-00086-273-5},
pages = {270-278},
publisher = {Pero},
title = {Ap stars with variable periods},
url = {https://arxiv.org/pdf/1310.6640.pdf},
year = {2014}
}
TY - JOUR
ID - 1230064
AU - Mikulášek, Zdeněk - Krtička, Jiří - Janík, Jaroslav - Zejda, Miloslav - Henry, Gregory - Paunzen, Ernst - Žižnovský, Jozef - Zverko, Juraj
PY - 2014
TI - Ap stars with variable periods
PB - Pero
CY - Moskva, Rusko
SN - 9785000862735
KW - stars:peculiar
KW - stars
UR - https://arxiv.org/pdf/1310.6640.pdf
L2 - https://arxiv.org/pdf/1310.6640.pdf
N2 - The majority of magnetic chemically peculiar (mCP) stars exhibit periodic light, magnetic, radio, and spectroscopic variations that can be modelled adequately as a rigidly-rotating main-sequence star with persistent surface structures. Nevertheless, there is a small sample of diverse mCP stars whose rotation periods vary on timescales of decades while the shapes of their phase curves remain unchanged. Alternating period increases and decreases have been suspected in the hot CP stars CU Vir and V901 Ori, while rotation in the moderately cool star BS Cir has been decelerating. These examples bring new insight into this theoretically unpredicted phenomenon. We discuss possible causes of such behaviour, and propose that dynamic interactions between a thin, outer, magnetically-confined envelope braked by the stellar wind, and an inner faster-rotating stellar body, are able to explain the observed rotational variability.
ER -
MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Jaroslav JANÍK, Miloslav ZEJDA, Gregory HENRY, Ernst PAUNZEN, Jozef ŽIŽNOVSKÝ and Juraj ZVERKO. Ap stars with variable periods. In G. Mathys, E. Griffin, O. Kochukhov, R. Monier, G. Wahlgren. \textit{Putting A Stars into Context: Evolution, Environment, and Related Stars}. Moskva, Rusko: Pero, 2014, p.~270-278. ISBN~978-5-00086-273-5.
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