Speaker
Description
Nova explosions are thermonuclear events on top of an accreting white dwarf in a cataclysmic variable (CV) or a symbiotic system. The nova event results in the increase of the optical luminosity by 7-8 orders of magnitude. That makes the nova outburst detectable at any distance in the Galaxy, in the Local Group and even beyond the Local Group. However, due to the resulting distance distribution of novae, the host system remains unknown for most cases. Accretion powers X-rays in the host system once the mass transfer is resumed and the white dwarf starts to accrete again. We search for old nova host systems in the German data of the eROSITA survey. A total of 31 old novae are identified, with about ⅔ of the identifications being new X-rays counterparts of old nova systems. Several of them are IP candidates, so increasing the fraction of known novae outbursts occurring in magnetic systems.
