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

Author(s): Chochol, D.; Shugarov, S.; Hambálek, Ľ.; Guarro, J.; Krushevska, V.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 49, no. 2, p. 159-170.
Date: 5/2019
Title: Optical photometry and spectroscopy of V612 Sct: slow classical nova with rebrightenings
Keyword(s): novae, photometry, spectroscopy
Pages: 159 -- 170
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: We present the results of multicolour UBVR_CI_C 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 V_max=8.42 mag and B_max=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 t_3,V=105 d and t_3,B=224 d. We estimated by applying MMRD relations the absolute magnitudes of the nova at maximum MV_max=-6.67 and MB_max=-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.