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Re: [vsnet-chat 6852] re Nova type classification thoughts > It's nice to know whether a nova was fast or slow. I think I was even going to > see if small regions preferentially provided one type or another at one point, > though I never did (some parts of Aquila, for example, have been nova rich). > > However, a classification based on _eventual_ lightcurve would be much nicer, > and more in keeping with other variable classification, and to some extent > suprenova classification, schemes. If type NA and NB comprise a continuum (as already suggested from the difficulty in numerically resolving them), any trial to distignish them would be simply superficial. Yes, the known t2 of novae has a variety with a dynamic range of an order of 10^2. This range is perfectly comparable to that of recurrence time of dwarf novae. Even though, no one wish try to distingusih UGSSa (t_rec about 10 d), UGSSb (t_rec about 100 d), UGSSc (t_rec much longer). This is because everyone knows that the basic underlying physics is essentially the same (the same is true for historical RRa and RRb classifications). > Whether there's a professional around nowadays how > could get hold of sufficient data to generate lightcurves, I do not know. > Indeed, use of T2 and/or T3 is probably an attempt to get around the sparsity > of data for many past novae. I don't argue against the usage of T2 or T3 for as a measure of nova decline rate. My assertion is that simply correlating T2/T3 with historical nova classification scheme will not be highly productive. > PS re GU Mus and V518 Per and historical reasons: wasn't ROSAT working then? > Maybe they called for visual confirmations, thinking they'd detected xray > signatures of novae, whilst in effect these were not quite classical novae, at > least in optical terms? There certainly appears to have been a window of xray > novae discoveries suggesting a connection with a satellite campaign. Nothing is essentially different between these two X-ray novae. GU Mus = GS/GRS 1124-68, V518 Per = GRO J0422+32. Almost all X-ray novae have been called for identificaions in visual/infrared light. Both objects contain a black hole or a neutron star, which is essentially different from classical novae. Regards, Taichi Kato
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