MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Juraj ZVERKO, G.W. HENRY, Jan JANÍK, I.I. ROMANYUK, Jozef ŽIŽNOVSKÝ, Hrvoje BOŹIČ, Miloslav ZEJDA, Tomáš GRÁF and Martin NETOLICKÝ. The record-breaking rotational deceleration of the He strong CP star HD 37776 (V901 Ori). Contributions of the Astronomical Observatory Skalnaté Pleso. Tatranska Lomnica, Slovak Republic: Astronomický ústav SAV, 2008, vol. 38, No 2, p. 429-430. ISSN 1335-1842.
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Basic information
Original name The record-breaking rotational deceleration of the He strong CP star HD 37776 (V901 Ori)
Name in Czech Rekordní rotační brždění He silné chemicky pekuliární hvězdy HD 37776 (V901 Ori)
Authors MIKULÁŠEK, Zdeněk (203 Czech Republic, guarantor), Jiří KRTIČKA (203 Czech Republic), Juraj ZVERKO (703 Slovakia), G.W. HENRY (840 United States of America), Jan JANÍK (203 Czech Republic), I.I. ROMANYUK (643 Russian Federation), Jozef ŽIŽNOVSKÝ (703 Slovakia), Hrvoje BOŹIČ (191 Croatia), Miloslav ZEJDA (203 Czech Republic), Tomáš GRÁF (203 Czech Republic) and Martin NETOLICKÝ (203 Czech Republic).
Edition Contributions of the Astronomical Observatory Skalnaté Pleso, Tatranska Lomnica, Slovak Republic, Astronomický ústav SAV, 2008, 1335-1842.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher Slovakia
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14310/08:00024754
Organization unit Faculty of Science
UT WoS 000256514000061
Keywords in English stars: chemically peculiar; stars: early type; stars: variables; stars: individual: HD37776; stars: rotation; methods: data analysis;
Tags methods: data analysis, stars: chemically peculiar, stars: early type, stars: individual: HD37776, stars: rotation, stars: variables
Tags International impact
Changed by Changed by: doc. RNDr. Miloslav Zejda, Ph.D., učo 169695. Changed: 24/6/2009 11:25.
Abstract
We study the long-term light and spectral variations in the He-strong, magnetic chemically peculiar star HD37776 to search for changes of its 1.5387d period in 1976 - 2007. We analyze all published photometric observations and spectrophotometry in the He I 4026 A line. The data were supplemented with 506 new UVB observations obtained during the last 2 observing seasons, 66 estimates of He I equivalent widths on 23 CFHT spectrograms and 69 on Zeeman spectrograms from the 6-m telescope. All the 1895 particular observations have been processed simultaneously. We confirm the previously suspected increase of the period which is a record among CP stars. The mean rate of the period increase during the last 31 years is 0.541+/-0.020 s per year. We interpret this ongoing period increase as the slowing down of the star's surface rotation due to momentum loss through events and processes in its magnetosphere.
Abstract (in Czech)
We study the long-term light and spectral variations in the He-strong, magnetic chemically peculiar star HD37776 to search for changes of its 1.5387d period in 1976 - 2007. We analyze all published photometric observations and spectrophotometry in the He I 4026 A line. The data were supplemented with 506 new UVB observations obtained during the last 2 observing seasons, 66 estimates of He I equivalent widths on 23 CFHT spectrograms and 69 on Zeeman spectrograms from the 6-m telescope. All the 1895 particular observations have been processed simultaneously. We confirm the previously suspected increase of the period which is a record among CP stars. The mean rate of the period increase during the last 31 years is 0.541+/-0.020 s per year. We interpret this ongoing period increase as the slowing down of the star's surface rotation due to momentum loss through events and processes in its magnetosphere.
Links
GA205/06/0217, research and development projectName: Nové postupy ve zpracování a interpretaci pozorování proměnných hvězd
Investor: Czech Science Foundation, New approaches to variable stars data processing and interpretation
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