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Re: [vsnet-chat 6488] 93 comp star for RS Oph > The GCVS team simply didn't use the distinction between thermonuclear > runaway events (NRa) or disk instability events (NRb). That would be a > useful thing to add in a future release. > RS Oph is an NRb. No, no ;-). Both objects are now understood as thermonuclear runaway (TNR) events. Regarding the RS Oph itself, multiwavelength observations of the 1985 outburst cofnirm the TNR nature. There was an idea of mass-transfer burst in symbiotic recurrent novae, but it is now known that this mechanism can not explain observations well. See some recent series of papers by Hachisu et al. for recurrent novae. There was an old discussion that the compact object of T CrB exceeds the Chandrasekkar mass, and must not be a white dwarf, is now positively resolved by more accurate recent radial velocity studies. There is a sometimes used classification of NRa and NRb, which is based on the speed class (as in classical novae). Regards, Taichi Kato
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