| MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, G.W. HENRY, Juraj ZVERKO, Jozef ŽIŽNOVSKÝ, David BOHLENDER, I.I. ROMANYUK, Jan JANÍK, Hrvoje BOŽIĆ, Daniela KORČÁKOVÁ, Miloslav ZEJDA, I.Kh. ILIEV, Petr ŠKODA, Miroslav ŠLECHTA, Tomáš GRÁF, Martin NETOLICKÝ a Michal CENIGA. The extremely rapid rotational braking of the magnetic helium-strong star HD 37776. Astronomy and Astrophysics. Les Ulis Cedex, France: EDP Sciences, 2008, roč. 2008, č. 485, s. 585-597. ISSN 0004-6361. |
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@article{769869,
author = {Mikulášek, Zdeněk and Krtička, Jiří and Henry, G.W. and Zverko, Juraj and Žižnovský, Jozef and Bohlender, David and Romanyuk, I.I. and Janík, Jan and Božić, Hrvoje and Korčáková, Daniela and Zejda, Miloslav and Iliev, I.Kh. and Škoda, Petr and Šlechta, Miroslav and Gráf, Tomáš and Netolický, Martin and Ceniga, Michal},
article_location = {Les Ulis Cedex, France},
article_number = {485},
keywords = {stars: chemically peculiar; stars: early type; stars: variables: general; stars: individual: HD 37776},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {The extremely rapid rotational braking of the magnetic helium-strong star HD 37776},
volume = {2008},
year = {2008}
}
TY - JOUR
ID - 769869
AU - Mikulášek, Zdeněk - Krtička, Jiří - Henry, G.W. - Zverko, Juraj - Žižnovský, Jozef - Bohlender, David - Romanyuk, I.I. - Janík, Jan - Božić, Hrvoje - Korčáková, Daniela - Zejda, Miloslav - Iliev, I.Kh. - Škoda, Petr - Šlechta, Miroslav - Gráf, Tomáš - Netolický, Martin - Ceniga, Michal
PY - 2008
TI - The extremely rapid rotational braking of the magnetic helium-strong star HD 37776
JF - Astronomy and Astrophysics
VL - 2008
IS - 485
SP - 585-597
EP - 585-597
PB - EDP Sciences
SN - 00046361
KW - stars: chemically peculiar
KW - stars: early type
KW - stars: variables: general
KW - stars: individual: HD 37776
N2 - We attempt to confirm the possible period change of HD 37776 and discuss a possible origin of this change as a consequence of i) duplicity; ii) precession; iii) evolutionary changes; and iv) continuous/discrete/transient angular momentum loss. We analyse 1895 individual observations obtained by various techniques were processed simultaneously by means of specially developed robust codes. We confirm the previously suspected gradual increase in the period of HD 37776 and find that it has lengthened by a remarkable 17.7+/-0.7 s over the past 31 years. We also note that a decrease in the rate of the period change is not excluded by the data. The shapes of light curves in all colours were found to be invariable. We interpret this ongoing period increase as a braking of the star's rotation, at least in its surface layers, due to the momentum loss through events or processes in the extended stellar magnetosphere.
ER -
MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, G.W. HENRY, Juraj ZVERKO, Jozef ŽIŽNOVSKÝ, David BOHLENDER, I.I. ROMANYUK, Jan JANÍK, Hrvoje BOŽI$\backslash$'C, Daniela KORČÁKOVÁ, Miloslav ZEJDA, I.Kh. ILIEV, Petr ŠKODA, Miroslav ŠLECHTA, Tomáš GRÁF, Martin NETOLICKÝ a Michal CENIGA. The extremely rapid rotational braking of the magnetic helium-strong star HD 37776. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2008, roč.~2008, č.~485, s.~585-597. ISSN~0004-6361.
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