Rotational period variations in magnetic chemically peculiar star HD 37776

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Authors	MIKULÁŠEK Zdeněk KRTIČKA Jiří HENRY G.W. JANÍK Jan ZEJDA Miloslav LUEFTINGER T. PAUNZEN Ernst ROMANYUK I. I. KUDRYAVTSEV D.O.
Year of publication	2011
Type	Appeared in Conference without Proceedings
MU Faculty or unit	Faculty of Science
Citation
Description	Three decades of a precise photometric and spectroscopic monitoring of the young hot magnetic chemically peculiar star HD 37776 have revealed its continual rotational deceleration, increasing the period by a remarkable 18 s! The deceleration was interpreted as the rotational braking of the outer stellar layers due to the angular momentum loss in the stellar magnetosphere. Observational data have been recently supplemented by own new photometric data. We present here the results of the sophisticated analysis of all available observed data showing that the period reached its maximum of 1.538766 d in the year 2004, when the rotation period began to decrease. The nature of such unpredicted period changes and the paradox of the spin-down time are briefly discussed.
Related projects:	Spectral energy distribution of hot stars and its variability Fyzika hvězd a hvězdných soustav