Journal Article

Nova V5579 Sgr 2008: near-infrared studies during maximum and the early decline phase

Ashish Raj, N. M. Ashok and D. P. K. Banerjee

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 4, pages 3455-3461
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18994.x
Nova V5579 Sgr 2008: near-infrared studies during maximum and the early decline phase

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We present near-infrared spectroscopic and photometric observations of the nova V5579 Sgr during the maximum and early decline phase. The spectra follow the evolution of the nova from peak brightness when the lines had strong P Cygni profiles to a phase dominated by prominent emission lines. The spectra during the emission phase are dominated by strong H i lines from the Brackett and Paschen series, O i and C i lines. The spectra in the final stages of our observations show a rising continuum towards longer wavelengths, indicating dust formation. Dust formation in V5579 Sgr is consistent with the presence of lines of elements with low-ionization potentials like Na and Mg in the early spectra. The early presence of such lines had been earlier suggested by us to be potential indicators of dust formation later in the nova’s development. We also discuss the possibility of using P Cygni profiles to probe the properties of the erupting white dwarf during the early outburst.

Keywords: line: identification; techniques: spectroscopic; stars: individual: V5579 Sgr; novae, cataclysmic variables

Journal Article.  4708 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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