The record-breaking rotational deceleration of the He strong CP star HD 37776 (V901 Ori) (CROSBI ID 544270)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mikulášek, Z. ; Krtička, J. ; Zverko, J. ; Henry, G. W. ; Janík, J. ; Romanyuk, I. I. ; Žižňovský, J. ; Božić, Hrvoje ; Zejda, M. ; Gráf, T. ; Netolický, M.
engleski
The record-breaking rotational deceleration of the He strong CP star HD 37776 (V901 Ori)
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.
stars: chemically peculiar; stars: individual: HD 37776
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Podaci o prilogu
429-430.
2008.
objavljeno
Podaci o matičnoj publikaciji
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
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poster
29.02.1904-29.02.2096