Nova Cygni 2001/2 = V2275 Cyg

We present an analysis of low- and medium resolution spectra of the very fast nova, Nova Cygni 200½ (V2275 Cyg) obtained at nine epochs in August, September and October, 2001. The expansion velocity from hydrogen Balmerlines is found to be 2100 km s - 1 , although an early Hα profile showed a weak feature at -3500 km s - 1 , too. The overall appearance of the optical spectrum is dominated by broad lines of H, He and N, therefore, the star belongs to the "He/N" subclass of novae defined by Williams (1992). Interstellar lines and bands, as well as BV photometry taken from the literature yielded to a fairly high reddening of E(B - V) = 1 m . 0 ′ 0 m 1. The visual light curve was used to deduce M V by the maximum magnitude versus rate of decline relationship. The resulting parameters are: t 0 = 2 452 141.4 + 0 . 1 - 0 . 5 , t 2 = 2.9 ′ 0.5 days, t 3 = 7 ′ 1 days, M V = -9 m .7 ′0 m .7. Adopting these parameters, the star lies between 3 kpc and 8 kpc from the Sun.