| MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Jan JANÍK, Miloslav ZEJDA, Michal CENIGA, Martin NETOLICKÝ, Tomáš GRÁF, Gregory W. HENRY, Juraj ZVERKO, Jozef ŽIŽNOVSKÝ, David BOHLENDER, Iosif V. ROMANYUK, Hrvoje BOŽIČ, Daniela KORČÁKOVÁ, Petr ŠKODA, Miroslav ŠLECHTA a Ilian Kh. ILIEV. The extremely rapid rotational braking of the magnetic helium-strong star HD 37776. Ostrava: Vysoká škola báňská-Technická univerzita Ostrava, 2009. |
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@article{814404,
author = {Mikulášek, Zdeněk and Krtička, Jiří and Janík, Jan and Zejda, Miloslav and Ceniga, Michal and Netolický, Martin and Gráf, Tomáš and Henry, Gregory W. and Zverko, Juraj and Žižnovský, Jozef and Bohlender, David and Romanyuk, Iosif V. and Božič, Hrvoje and Korčáková, Daniela and Škoda, Petr and Šlechta, Miroslav and Iliev, Ilian Kh.},
article_location = {Ostrava},
keywords = {chemically peculiar stars; early type stars; variable stars; individual: \hvezda; stellar rotation; methods of data analysis},
language = {eng},
title = {The extremely rapid rotational braking of the magnetic helium-strong star HD 37776},
year = {2009}
}
TY - JOUR
ID - 814404
AU - Mikulášek, Zdeněk - Krtička, Jiří - Janík, Jan - Zejda, Miloslav - Ceniga, Michal - Netolický, Martin - Gráf, Tomáš - Henry, Gregory W. - Zverko, Juraj - Žižnovský, Jozef - Bohlender, David - Romanyuk, Iosif V. - Božič, Hrvoje - Korčáková, Daniela - Škoda, Petr - Šlechta, Miroslav - Iliev, Ilian Kh.
PY - 2009
TI - The extremely rapid rotational braking of the magnetic helium-strong star HD 37776
PB - Vysoká škola báňská-Technická univerzita Ostrava
KW - chemically peculiar stars
KW - early type stars
KW - variable stars
KW - individual: \hvezda
KW - stellar rotation
KW - methods of data analysis
N2 - We analyse all available observations of the famous He-strong magnetic chemically peculiar (mCP) star HD~37776 obtained since 1976, namely 1707 photometric measurements, including 550 of our own recent BV observations, and 188 spectrophotometric or spectroscopic measurements of He I spectral lines equivalent widths. All of these individual observations were processed simultaneously by means of specially developed robust codes. We find that the 1.5387 d period of HD 37776 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. The period increase is interpreted as a consequence of the momentum loss through events or processes in the extended stellar magnetosphere.
ER -
MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Jan JANÍK, Miloslav ZEJDA, Michal CENIGA, Martin NETOLICKÝ, Tomáš GRÁF, Gregory W. HENRY, Juraj ZVERKO, Jozef ŽIŽNOVSKÝ, David BOHLENDER, Iosif V. ROMANYUK, Hrvoje BOŽIČ, Daniela KORČÁKOVÁ, Petr ŠKODA, Miroslav ŠLECHTA a Ilian Kh. ILIEV. The extremely rapid rotational braking of the magnetic helium-strong star HD 37776. Ostrava: Vysoká škola báňská-Technická univerzita Ostrava, 2009.
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