2009
The extremely rapid rotational braking of the magnetic helium-strong star HD 37776
MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Jan JANÍK, Miloslav ZEJDA, Michal CENIGA et. al.Basic information
Original name
The extremely rapid rotational braking of the magnetic helium-strong star HD 37776
Name in Czech
Extrémně rychlé rotační brzdění magnetické héliové hvězdy HD 37776
Authors
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 and Ilian Kh. ILIEV
Edition
Ostrava, Vysoká škola báňská-Technická univerzita Ostrava, 2009
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10308 Astronomy
Country of publisher
Czech Republic
Confidentiality degree
is not subject to a state or trade secret
Organization unit
Faculty of Science
UT WoS
000256890300030
Keywords in English
chemically peculiar stars; early type stars; variable stars; individual: \hvezda; stellar rotation; methods of data analysis
Tags
Tags
International impact
Changed: 28/2/2013 11:30, RNDr. Jan Janík, Ph.D.
V originále
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.
Links
GA205/06/0217, research and development project |
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MEB080832, research and development project |
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