Summary: The detection of X-ray emission from classical novae after its explosion provides crucial information on the phenomenon of nova.Las properties and the duration of emission x-ray baldos are of direct indicators of the thermonuclear burning remnant layer on the surface of the dwarf balca while quela hard X-ray emission from representing a diagnosis of conditions in the material eyectado by nova and may indicate the restoration of accretion in binary. This thesis has developed a numerical model to simulate the conditions in the envelopment of the dwarf balca after dela nova explosion, stationary combustion of higrógeno.Se have found five chemical compositions, for realistic abundances of CO and novas One the models of Joseph & Hernanz (
1998, Apj, 9494.680). Developments approximates as a sequence of stationary states with masses decrecientes.Los results show that a sheath of white dwarf stationary combustion of hydrogen moving along a "plateau" of nearly constant brightness, reducing its radio fotosférico and increasing the effective temperature as the mass of the hydrogen-rich envelope is reduced by the burning termonuclear.Las reactions thermonuclear continue until the mass of the envelope is reduced to a value mínimo.Crítico, below cúal there is a stable solution for the enclosure with a stationary combustion. At this point, thermonuclear combustion sources are shut down and the star begins to cool. The results of models of dwarf wrapper has been compared to observations in X-ray novae after the explosión.En Specifically, the results have been compared with theoretical comments made by ROSAT of the three nomvas that detected the satellite broadcast of soft X-ray: V1974 Cyg (Nova Cygni 1992), GQ Mus (Nova Muscae 1983) and Nova LMC 1995.A from this comparison can be obtained limits par values of the mass of the white dwarf, the mass of the envelope and the abundance of hydrogen mass of the envelope. In order to expand the number of observations in X-ray novae after the explosion, there have been observations with the European satellite XMM.Newton five novas discovered in 1997-1998.En the case of nova Oph 1998 (v2487 Oph ) has found that the increase has been restored in binary hands of 1000 days after the explosion, which represents a shorter time than expected (Hernanz & Hall, 2002, Science, 298393). addition was the first nova also detected in X-rays before the explosion.
