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Issue A&A
Volume 384, Number 3, March IV 2002
Page(s) 982 - 986
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020064



A&A 384, 982-986 (2002)
DOI: 10.1051/0004-6361:20020064

Nova Cygni 2001/2 = V2275 Cyg

L. L. Kiss1, N. Gogh1, J. Vinkó2, G. Furész1, B. Csák1, H. DeBond3, J. R. Thomson3 and A. Derekas1

1  Department of Experimental Physics and Astronomical Observatory, University of Szeged, Szeged, Dóm tér 9., 6720, Hungary
2  Department of Optics and Quantum Electronics, University of Szeged, POB 406, Szeged, 6701, Hungary
3  David Dunlap Observatory, University of Toronto, Richmond Hill, Canada

(Received 26 November 2001 / Accepted 11 January 2002)

Abstract
We present an analysis of low- and medium resolution spectra of the very fast nova, Nova Cygni 2001/2 (V2275 Cyg) obtained at nine epochs in August, September and October, 2001. The expansion velocity from hydrogen Balmer lines is found to be 2100 km s -1, although an early H $\alpha$ 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 $E(B-V)=1\fm0\pm0\fm1$. The visual light curve was used to deduce MV by the maximum magnitude versus rate of decline relationship. The resulting parameters are: $t_0=2\,452\,141.4^{+0.1}_{-0.5}$, $t_2=2.9\pm0.5$ days, $t_3=7\pm1$ days, $M_{V}=-9\fm7\pm0\fm7$. Adopting these parameters, the star lies between 3 kpc and 8 kpc from the Sun.


Key words: stars: novae, cataclysmic variables -- stars: individual: V2275 Cyg

Offprint request: L. L. Kiss, l.kiss@physx.u-szeged.hu

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