Torsional oscillations and observed rotational period variations in early-type stars

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00479263" target="_blank" >RIV/67985815:_____/17:00479263 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/17:00094567

Result on the web

<a href="http://dx.doi.org/10.1093/mnras/stw2451" target="_blank" >http://dx.doi.org/10.1093/mnras/stw2451</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stw2451" target="_blank" >10.1093/mnras/stw2451</a>

Result language

angličtina

Original language name

Torsional oscillations and observed rotational period variations in early-type stars

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Volume of the periodical

464

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

933-939

UT code for WoS article

000393646300070

EID of the result in the Scopus database

2-s2.0-85014762391