V1027-CYG FROM 1992 TO 1995 - UBV PHOTOMETRY, SPECTRUM, AND RADIAL-VELOCITIES

The UBV photometry performed from 1992 to 1996, spectroscopic observat ions, and individual radial-velocity estimates for the semiregular var iable V1027 Cyg-a candidate for protoplanetary objects-are presented. The star exhibited two types of light variation: low-amplitude variati ons 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 lig ht variations are attributable to pulsations of the star. The radial v elocities ranged from -10 to +20 km s(-1) there was a considerable pha se shift between the radial-velocity curve and the light curve at the epochs of deep minima in 1992 and 1995. The spectral energy distributi on of V1027 Cyg during the 1995 minimum matched that of a K2 supergian t with more intense TiO bands.