K. S. Kuratov

Photometric investigation of the Herbig Ae/Be star MWC 297. I. Quasisimultaneous UBVRIJHK observations

In order to make a statistical investigation of the photometric variability of the young star MWC 297 a number of quasisimultaneous observations in the photometric bands UBVRIJHK has been made. The coefficients of the correlation between the variations of the brightness in the different photometric bands have been determined by the proposed method. An anticorrelation between the variations in the bands U and K has been found. A possible mechanisms of the irregular variability of the star is proposed.

Nova Vulpeculae 1984 N 2 in 1985

The results ofUBVRIJHK photometric,UBVRI polarimetric, and spectrophotometric (γγ322.5–722.5 nm) observations of the second Nova Vulpeculae (QU Vul) are given for the period from May 1985 to December 1985. A dust shell of the Nova was discovered in June 1985. A model of the dust shell, to explain the observed properties of the Nova, is proposed. The paper reportsMv,Teff, and the radius of the Nova for several times.Observations of QU Vul were launched with the 1 m telescope of the Assy High-Altitude Observatory (near Alma-Ata) in January 1985. The first results ofUBVRIJHK photometry were published by Bergneret al. (1985a, b). Photometry of the Nova was performed 19 times over the period May 1985–December 1985 (Table I). The observations were made with the three-channel multipurpose photometer-polarimeter FP3U (Bergneret al., 1985c, d). Nineteen Vul and 23 Vul (Table IV) served as comparison stars.