The early spectral evolution of Nova Cassiopeiae 1993

Details The early spectral evolution of Nova Cassiopeiae 1993 The early spectral evolution of Nova Cassiopeiae 1993

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1008h&link_type=abstract

The Astronomical Journal, vol. 108, no. 3, p. 1008-1015

Physics

38

Light Curve, Novae, Spectral Energy Distribution, Stellar Mass Ejection, Stellar Physics, Stellar Spectra, Stellar Temperature, Ultraviolet Radiation, Carbon, Evolution (Development), Graphs (Charts), Hydrogen, Iue, Nitrogen, Oxygen, Spectrum Analysis, Stellar Models, Tables (Data)

Scientific paper

In this paper we describe the evolution of Nova Cas 1993 over the first two months of its outburst. We present an ultraviolet light curve that covers the period from announcement to just after dust began forming in the ejecta (1994 Feb. 15) and International Ultraviolet Explorer (IUE) spacecraft constraints forced us to halt our observations. We have used spherical, expanding, Non-local Thermodynamic Equilibrium (NLTE) stellar atmospheres to compute synthetic spectra and have compared the results to combined ultraviolet (low-resolution 1200-3400 A and high-resolution 2400-3300 A) spectra. Our fits show that the effective temperature of the ejecta increased from approx. 8000 to about approx. 16 000 K between 1993 Dec. 12 and 1993 Dec. 26. The temperature then increased more slowly to approx. 24 000 on 1994 Jan. 28. A preliminary abundance analysis shows evidence for hydrogen depletion, as we also found for Nova V1974 Cygni; however we find a larger enhancement of carbon, nitrogen, and oxygen. We also show that the principal mechanism for mass ejection in this nova is a radiation pressure driven wind and that mechanical driving is not necessary.

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