CAOSP abstracts, Volume: 49, No.: 2, year: 2019

Abstract: We present the results of multicolour UBVRCIC CCD photometry and optical echelle spectroscopy of the slow classical nova V612 Sct, discovered during its outburst on 2017 June 19.41 UT. The nova reached its brightness maximum Vmax=8.42 mag and Bmax=9.53 mag on 2017 July 29.99 UT. The light curve allows to classify it as a slow nova of the J-class with multiple peaks on the decline. We used the V and B light curves to find the rates of decline t3,V=105 d and t3,B=224 d. We estimated by applying MMRD relations the absolute magnitudes of the nova at maximum MVmax=-6.67 and MBmax=-6.44. The latter value yields a mass of 0.65 M for the white dwarf component. We estimated the colour excess E(B-V) = 0.755 and found the distance 3.5 kpc to the nova. The study of radial velocities of Hα and Hβ P Cyg absorptions revealed two distinct components of the expanding envelope accelerated by a variable wind with the terminal velocity up to 1900 km s-1. The P Cyg absorptions were most enhanced during rebrightenings.

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Last update: May 30, 2019