Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-10
Mon.Not.Roy.Astron.Soc. 328 (2001) 1169
Astronomy and Astrophysics
Astrophysics
13 pages, latex, 7 figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04962.x
We report the results of observations of V4633 Sgr (Nova Sagittarii 1998) during 1998-2000. Two photometric periodicities were present in the light curve during the three years of observations: a stable one at P=3.014 h, which is probably the orbital period of the underlying binary system, and a second one of lower coherence, approximately 2.5 per cent longer than the former. The latter periodicity may be a permanent superhump, or alternatively, the spin period of the white dwarf in a nearly synchronous magnetic system. A third period, at P=5.06 d, corresponding to the beat between the two periods was probably present in 1999. Our results suggest that a process of mass transfer took place in the binary system since no later than two and a half months after the nova eruption. We derive an interstellar reddening of E(B-V)~0.21 from our spectroscopic measurements and published photometric data, and estimate a distance of d~9 kpc to this nova.
Leibowitz Elia M.
Lipkin Yiftah
Retter Alon
Shemmer Ohad
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