The light variations and spectrum of the possible protoplanetary object V1027 CYG

Details The light variations and spectrum of the possible protoplanetary object V1027 CYG The light variations and spectrum of the possible protoplanetary object V1027 CYG

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18..175a&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 175; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 5, May 1992, p. 436-

Astronomy and Astrophysics

Astronomy

2

Color-Color Diagram, Infrared Stars, Light Curve, Protoplanets, Supergiant Stars, Ubv Spectra, Balmer Series, Interstellar Extinction, Red Shift

Scientific paper

Results of UBV photometry during 42 nights in 1991-1992 and also spectral observations of the possible protoplanetary object V1027 Cyg are presented. The star exhibits semiregular light variations with amplitudes of about 0.4 m in V-bands, 0.5 m in B-bands, and 0.8 m in U-bands on a time scale of 100 d. The star can be classified as an SRd in terms of variability type. The star's considerable color excess can be explained by interstellar or circumstellar reddening. The spectrum is similar to that of a normal G-supergiant, but the BaII intensity lines are perhaps strengthened.

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