Naslov
The record-breaking rotational deceleration of the He strong CP star HD 37776 (V901 Ori)

Autori
Mikulášek, Z. ; Krtička, J. ; Zverko, J. ; Henry, G. W. ; Janík, J. ; Romanyuk, I. I. ; Žižňovský, J. ; Božić, Hrvoje ; Zejda, M. ; Gráf, T. ; Netolický, M.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the CP#AP Workshop, Vienna, Austria, September 10-14, 2007 / Ziznovsky, J. ; Zverko, J. ; Paunzen, E. ; Netopil, M. - Vysoké Tatry : Astronomical Institute of the Slovak Academy of Sciences, 2008, 429-430

Skup
CP#AP Workshop

Mjesto i datum
Beč, Austrija, 10.09.2007. - 14.09.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
stars: chemically peculiar; stars: individual: HD 37776

Sažetak
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 Å 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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