The reanalysis of the ROSAT data of classical nova V1974 Cygni 1992

BALMAN Ş. , Ogelman H., Krautter J.

Wild Stars in the Old West - 13th North American Workshop on Cataclysmic Variables and Related Objects, Wyoming, Amerika Birleşik Devletleri, 14 - 19 Haziran 1997, cilt.137, ss.400-405 identifier

  • Cilt numarası: 137
  • Basıldığı Şehir: Wyoming
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.400-405


The ROSAT PSPC data (0.1-2.4 keV) have been reanalyzed in order to understand the development of the classical nova V1974 Cygni 1992 after outburst in the X-ray wavelengths. The X-ray spectrum is fit with a two-component model. The first component is a white dwarf atmosphere emission model developed for the remnants of classical novae near the Eddington luminosity. The model is used to fit the soft X-ray data in similar to 0.1-1.0 keV range. The second component is a Raymond-Smith model of thermal plasma applied to the hard X-ray emission above similar to 1.0 keV. The results verify the standard nova theory that the radius of the stellar remnant decreases as the effective temperature increases at constant bolometric luminosity. The hard X-ray component is found to evolve independently from the soft one. The time evolution of the hard X-ray flux and the plasma temperatures decreasing from 10 keV to 1 keV suggest emission from shock heated gas as the origin of the hard component.