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@article{1359789, author = {Krtička, Jiří and Mikulášek, Zdeněk and Henry, Gregory W. and Kurfürst, Petr and Karlicky, Marian}, article_location = {Oxford}, article_number = {1}, doi = {http://dx.doi.org/10.1093/mnras/stw2451}, keywords = {MHD stars; chemically peculiar stars; early-type stars; magnetic field; stars rotation}, language = {eng}, issn = {0035-8711}, journal = {Monthly Notices of the Royal Astronomical Society}, title = {Torsional oscillations and observed rotational period variations in early-type stars}, url = {http://adsabs.harvard.edu/abs/2017MNRAS.464..933K}, volume = {464}, year = {2017} }
TY - JOUR ID - 1359789 AU - Krtička, Jiří - Mikulášek, Zdeněk - Henry, Gregory W. - Kurfürst, Petr - Karlicky, Marian PY - 2017 TI - Torsional oscillations and observed rotational period variations in early-type stars JF - Monthly Notices of the Royal Astronomical Society VL - 464 IS - 1 SP - 933-939 EP - 933-939 PB - OXFORD UNIV PRESS SN - 00358711 KW - MHD stars KW - chemically peculiar stars KW - early-type stars KW - magnetic field KW - stars rotation UR - http://adsabs.harvard.edu/abs/2017MNRAS.464..933K L2 - http://adsabs.harvard.edu/abs/2017MNRAS.464..933K N2 - Some chemically peculiar stars in the upper main sequence show rotational period variations of unknown origin. We propose that these variations are a consequence of the propagation of internal waves in magnetic rotating stars that lead to the torsional oscillations of the star. We simulate the magnetohydrodynamic waves and calculate resonant frequencies for two stars that show rotational variations: CU Vir and HD 37776. We provide updated analyses of rotational period variations in these stars and compare our results with numerical models. For CU Vir, the length of the observed rotational period cycle, Pi=67.6(5) yr, can be well reproduced by the models, which predict a cycle length of 51 yr. However, for HD 37776, the observed lower limit of the cycle length, Pi>100 yr, is significantly longer than the numerical models predict. We conclude that torsional oscillations provide a reasonable explanation at least for the observed period variations in CU Vir. ER -
KRTIČKA, Jiří, Zdeněk MIKULÁŠEK, Gregory W. HENRY, Petr KURFÜRST a Marian KARLICKY. Torsional oscillations and observed rotational period variations in early-type stars. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: OXFORD UNIV PRESS, 2017, roč.~464, č.~1, s.~933-939. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stw2451.
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