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Nova Sagittarii 1998 (V4633 Sgr): a permanent superhump system or an asynchronous polar? | OUP Journals & Magazine | IEEE Xplore

Nova Sagittarii 1998 (V4633 Sgr): a permanent superhump system or an asynchronous polar?

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Abstract:

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...Show More

Abstract:

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 has taken 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.
Published in: Monthly Notices of the Royal Astronomical Society ( Volume: 328, Issue: 4, December 2001)
Page(s): 1169 - 1180
Date of Publication: December 2001

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