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

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Authors

MIKULÁŠEK Zdeněk KRTIČKA Jiří ZVERKO Juraj HENRY G.W. JANÍK Jan ROMANYUK I.I. ŽIŽNOVSKÝ Jozef BOŹIČ Hrvoje ZEJDA Miloslav GRÁF Tomáš NETOLICKÝ Martin

Year of publication 2008
Type Article in Periodical
Magazine / Source Contributions of the Astronomical Observatory Skalnaté Pleso
MU Faculty or unit

Faculty of Science

Citation
Field Astronomy and astrophysics
Keywords stars: chemically peculiar; stars: early type; stars: variables; stars: individual: HD37776; stars: rotation; methods: data analysis;
Description 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.
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