V1027 Cyg from 1992 to 1995: UBV photometry, spectrum, and radial velocitiesстатья
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.
Аннотация:The UBV photometry performed from 1992 to 1996, spectroscopic observations, and individual radial-velocity estimates for the semiregular variable V1027 Cyg-a candidate for protoplanetary objects-are presented. The star exhibited two types of light variation: low-amplitude variations on a time scale of 200-250 days with a maximum amplitude in U and three deep minima whose amplitude depended only slightly on wavelength. During the deep minima, the star showed a noticeable bluing. The light variations are attributable to pulsations of the star. The radial velocities ranged from -10 to +20 km s(-1) there was a considerable phase shift between the radial-velocity curve and the light curve at the epochs of deep minima in 1992 and 1995. The spectral energy distribution of V1027 Cyg during the 1995 minimum matched that of a K2 supergiant with more intense TiO bands.