Near-infrared spectroscopy of classical novae in the coronal phase

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Line Spectra, Near Infrared Radiation, Novae, Stellar Coronas, Forbidden Transitions, Stellar Evolution, Stellar Mass Ejection, Stellar Temperature

Scientific paper

Spectroscopic observations of V1819 Cyg, V827 Her, and V2214 Oph, obtained at 1-2.5 microns using a 32-channel InSb array detector at the Cassegrain focus of the 2.7-m telescope at McDonald Observatory during 1986-1989, are reported. The data are presented in extensive tables and graphs and characterized in detail, with a focus on the nature of the 'coronal' emission. The ratios of Br-gamma (2.167 microns) and forbidden Si VI (1.960 microns) are found to be consistent with coronal gas temperatures of about 10,000 K and with photoionization as the primary mechanism of origin for the coronal species. Severe constraints on theoretical models involving shock heating and collisional ionization are inferred.

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