V1027 Cyg in 1992-1995: UBV photometry, spectrum, and radial velocities

Details V1027 Cyg in 1992-1995: UBV photometry, spectrum, and radial velocities V1027 Cyg in 1992-1995: UBV photometry, spectrum, and radial velocities

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..690a&link_type=abstract

Astronomy Letters, Volume 23, Issue 6, November 1997, pp.690-697; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 794

Astronomy and Astrophysics

Astronomy

4

Scientific paper

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.

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