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Title: Optical spectroscopy of the recurrent nova RS Ophiuchi – from the outburst of 2006 to quiescence
Authors: Mondal, Anindita
Anupama, G. C
Kamath, U. S
Das, Ramkrishna
Selvakumar, G
Mondal, Soumen
Keywords: Stars: individual: (RS Ophiuchi);Novae;Cataclysmic variables
Issue Date: Mar-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 474, No. 3, pp. 4211–4224
Abstract: Optical spectra of the 2006 outburst of RS Ophiuchi beginning one day after discovery to over a year after the outburst are presented here. The spectral evolution is found to be similar to that in previous outbursts. The early-phase spectra are dominated by hydrogen and helium (I and II) lines. Coronal and nebular lines appear in the later phases. Emission line widths are found to narrow with time, which is interpreted as a shock expanding into the red giant wind. Using the photoionization code CLOUDY, spectra at nine epochs spanning 14 months after the outburst peak, thus covering a broad range of ionization and excitation levels in the ejecta, are modelled. The best-fitting model parameters indicate the presence of a hot white dwarf source with a roughly constant luminosity of 1.26 × 1037 erg s-1. During the first three months, the abundances (by number) of He, N, O, Ne, Ar, Fe, Ca, S and Ni are found to be above solar abundances; the abundances of these elements decreased in the later phase. Also presented are spectra obtained during quiescence. A photoionization model of the quiescent spectrum indicates the presence of a low-luminosity accretion disc. The helium abundance is found to be subsolar at quiescence.
Description: Restricted Access
ISSN: 1365-2966
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Appears in Collections:IIAP Publications

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