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K. É. Annuk 《Astrophysics》1989,30(3):289-297
Institute of Astrophysics and Physics of the Atmosphere, Estonian Academy of Sciences. Translated from Astrofizika, Vol. 30, No. 3, pp. 476–487, May–June, 1989. 相似文献
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Ian D. Howarth Nolan R. Walborn Danny J. Lennon Joachim Puls Yaël Nazé K. Annuk I. Antokhin D. Bohlender H. Bond J.-F. Donati L. Georgiev D. Gies D. Harmer A. Herrero I. Kolka D. McDavid T. Morel I. Negueruela G. Rauw P. Reig 《Monthly notices of the Royal Astronomical Society》2007,381(2):433-446
We present extensive optical spectroscopy of the early-type magnetic star HD 191612 (O6.5f?pe–O8fp). The Balmer and He i lines show strongly variable emission which is highly reproducible on a well-determined 538-d period. He ii absorptions and metal lines (including many selective emission lines but excluding He ii λ4686 Å emission) are essentially constant in line strength, but are variable in velocity, establishing a double-lined binary orbit with P orb = 1542 d, e = 0.45 . We conduct a model-atmosphere analysis of the spectrum, and find that the system is consistent with a ∼O8 giant with a ∼B1 main-sequence secondary. Since the periodic 538-d changes are unrelated to orbital motion, rotational modulation of a magnetically constrained plasma is strongly favoured as the most likely underlying 'clock'. An upper limit on the equatorial rotation is consistent with this hypothesis, but is too weak to provide a strong constraint. 相似文献
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