Re: [vsnet-chat 2238] Re: (fwd) Nova Paper research > PU Vulpeculae is a symbiotic nova with a period of ~13 years! > This means a different binary configuration than in classical > novae, so despite the thermonuclear runaway, exclusion from > the nova list is justified. Several questions: 1) What seperates novae from non-novae? Does binary configuration play an essential part? 2) Has binary configuration of "justified novae" been confirmed anyway? 3) Recurrent novae have a broad spectrum in the sense of the binary structure. Aren't they considered as "novae" with mutiple recorded explosions? Regards, Taichi Kato