The record-breaking rotational braking of the He strong CP star HD 37776

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dc.creatorMikulasek, Z.
dc.creatorKrticka, J.
dc.creatorZverko, J.
dc.creatorHenry, G. W.
dc.creatorJanik, J.
dc.creatorRomanyuk, I. I.
dc.creatorZiznovsky, J.
dc.creatorBozic, H.
dc.creatorZejda, M.
dc.creatorGraf, T.
dc.creatorNetolicky, M.
dc.date2007-12-04
dc.date.accessioned2026-07-07T08:47:14Z
dc.date.available2026-07-07T08:47:14Z
dc.descriptionWe study the long-term light and spectral variations in the He-strong magnetic chemically peculiar star HD 37776 (V901 Ori) to search for changes of its 1.5387 d period in 1976-2007. We analyze all published photometric observations and spectrophotometry in the HeI 4026 A line. The data were supplmented with 506 new (U)VB observations obtained during the last 2 observing seasons, 66 estimates of HeI equivalent widths on 23 CFHT spectrograms and 35 of the 6-m Zeeman spectrograms. All the 1895 particular observations heve been processed simultaneously. We confirm the previously suspected increase of the period in HD 37776 which is a record-breaking 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.
dc.description3 pages, 1 figure, Proceedings of the "CP#AP Workshop", Vienna, 10.-14.Sept.2007, eds.J.Ziznovsky, J.Zverko, E.Paunzen, M.Netopil, will be published in Contrib. Astron. Obs. Skalnate Pleso
dc.identifierhttps://arxiv.org/abs/0712.0524
dc.identifierhttp://arxiv.org/abs/0712.0524
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143525
dc.subjectAstrophysics
dc.titleThe record-breaking rotational braking of the He strong CP star HD 37776
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