[vsnet-chat 994] Re: Nova Oph 1998 fading

[Taichi Kato <tkato>]

Alon Retter wrote:

> In the light curve of Nova V1974 Cygni 1992 (Retter & Leibowitz, 1998
> MNRAS, 297, L37), one can notice 3 different slopes. We believe that the
> first one is due to the contraction of the common envelope, the second
> might be related with the decay in the white dwarf light and the third 
> should be connected with the accretion disc. 

   I think the second phase is what is called the "nebular phase".  The
light from nebular lines ([O III] etc.) largely contribute to the visual
flux during this stage.  According to my old measurement on Nova Cyg 1992,
approx. 50% of the visual light came from the [O III] lines.  This, of
course, reflects the UV radiation from the cooling white dwarf, as Dr. Retter
mentioned.

   Has anyone got spectroscopy of Nova Oph 1998 recently?

Regards,
Taichi Kato

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