Variability of the H2O maser associated with the M-supergiant S Persei

Lekht, E.E.; Rudnitskij, G.M.; Mendoza-Torres, J.E.; Tolmachev, A.M.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

Авторы: Lekht E.E., Rudnitskij G.M., Mendoza-Torres J.E., Tolmachev A.M.
Журнал: Astronomy and Astrophysics
Том: 437
Номер: 1
Год издания: 2005
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 127
Последняя страница: 133
DOI: 10.1051/004-6361:20052635
Аннотация: We present the results from observing the circumstellar maser emission of the M-type supergiant S Per in the 616-523 water-vapour line at 1.35 cm. The observations were carried out in 1981-2002 (JD = 2444900-2 452 480) on the RT-22 radio telescope of the Pushchino Radio Astronomy Observatory, Astrospace Center of the Lebedev Institute of Physics, Russian Academy of Sciences. The H2O spectra obtained represent an unprecedented long, uniform dataset on this star. We discuss the properties of the optical and maser variations of S Per, together with particulars of the available VLBI maps. The close relation between maser and optical variations favors a model in which mass-loss is episodic. Changes observed in the total H2O line flux follow the visual light curve with a delay of 0.01 to 0.5P, where d is the mean light cycle for S Per. The feature at VLSR=-44 km s-1 flared in July 1988, which seemed to be the response of the maser to an unusually bright optical maximum. The position of the -44-km s-1 feature on the VLBI maps coincides with the direction toward the optical stellar disc, which can be explained by amplification of enhanced stellar continuum by the H2O line.
Добавил в систему: Рудницкий Георгий Михайлович

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Variability of the H2O maser associated with the M-supergiant S Perseiстатья

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