EDP Sciences
Free access
Volume 415, Number 2, February IV 2004
Page(s) 471 - 476
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20034615

A&A 415, 471-476 (2004)
DOI: 10.1051/0004-6361:20034615

Photometric study of two novae in M 31

Y. C. Joshi1, A. K. Pandey1, D. Narasimha2, Y. Giraud-Héraud3, R. Sagar1 and J. Kaplan3

1  State Observatory, Manora peak, Nainital 263129, Uttaranchal, India
2  Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
3  Laboratoire de Physique Corpusculaire, Collège de France, Laboratoire associé au CNRS-IN2P3 (URA 6411), 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France

(Received 26 May 2003 /accepted 15 October 2003)

We report $R_{\rm c}I_{\rm c}$ light curves of 2 novae in the M 31 galaxy which were detected in the four year Nainital Microlensing Survey. One of these novae has been tracked from the initial increase in flux while other has been observed during its descending phase of brightness. The photometry of the first nova during the outburst phase suggests its peak  $R_{\rm c}$ magnitude to be about 17.2 mag with a flux decline rate of 0.11 mag day -1 which indicates that it was a fast nova. A month after its outburst, it shows reddening followed by a plateau in  $I_{\rm c}$ flux. The second nova exhibits a bump in  $R_{\rm c}$ and  $I_{\rm c}$, possibly about three weeks after the outburst.

Key words: galaxies: individual: M 31 -- stars: novae, cataclysmic variables

Offprint request: Y. C. Joshi, yogesh@upso.ernet.in

SIMBAD Objects

© ESO 2004