Journal Article

Optical evolution of Nova Ophiuchi 2007 = V2615 Oph

U. Munari, A. Henden, M. Valentini, A. Siviero, S. Dallaporta, P. Ochner and S. Tomasoni

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 387, issue 1, pages 344-348
Published in print June 2008 | ISSN: 0035-8711
Published online May 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13238.x
Optical evolution of Nova Ophiuchi 2007 = V2615 Oph

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The moderately fast Nova Oph 2007 reached maximum brightness on 2007 March 28 at V= 8.52, BV=+1.12, VRC=+0.76, VIC=+1.59 and RCIC=+0.83, after fast initial rise and a pre-maximum halt lasting a week. Decline times were tV2= 26.5, tB2= 30, tV3= 48.5 and tB3= 56.5 d. The distance to the nova is d= 3.7 ± 0.2 kpc, the height above the Galactic plane is z= 215 pc, the reddening is E(BV) = 0.90 and the absolute magnitude at maximum is MmaxV=−7.2 and MmaxB=−7.0. The spectrum four days before maximum resembled a F6 supergiant, in an agreement with broad-band colours. It later developed into that of a standard ‘Fe ii’-class nova. Nine days past maximum, the expansion velocity estimated from the width of Hα emission component was ∼730 km s−1, and the displacement from it of the principal and diffuse-enhanced absorption systems was ∼650 and 1380 km s−1, respectively. Dust probably formed and disappeared during the period from 82 to 100 d past maximum, causing (at peak dust concentration) an extinction of ΔB= 1.8 mag and an extra ΔE(BV) = 0.44 reddening.

Keywords: novae, cataclysmic variables

Journal Article.  3211 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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