[vsnet-chat 1597] Re: [vsnet-alert 2575] Nova Mus 98 - a possible periodicity

[Taichi Kato <tkato>]

Re: [vsnet-chat 1596] Re: [vsnet-alert 2575] Nova Mus 98 - a possible periodicity

Dear Dr. Retter,

> I think that it is too early to discuss in details this unconfirmed
> result.

    No, nothing is too early for such an important implication, inspiring
these discussions.  Without your notification, the latent periodicity may
have been overlooked forever.  It might be even possible the 0.15-mag
variation evolve into the eclipsing feature, as was witnessed in V838 Her
(Nova Her 1991), since both the large outburst amplitude and an early
suggestion of periodicity may be partly explained by the large inclination.

    If the modulated light is from the secondary, it would be worth searching
for the signature of the secondary (moving narrow emission line??).  But,
the 0.15-mag flux at mag 13 is equivalent to mag 15, which is probably
6 mag below the maximum.  When assuming the maximum absolute magnitude
above -7 (for fast novae), the secondary (or the modulated component)
should be brighter than the M_V = -1 (what temperature is expected?).
Variation orginating from the accretion disk should be certainly as luminous,
which implies the accretion disk is above the thermal instability line.
In the latter case, one should consider a mechanism other than usual
thermal disk instability in order to explain oscillations in the transition
phase.

Regards,
Taichi Kato

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