[vsnet-alert 981] Re: possible nova in Sco

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Fraser Farrell wrote:

> Nova? Sco 1997    11.0     -  VSS RASNZ  AI Sco sequence
> 
> This seems to be dropping too quickly for a "real" nova.  Is it a UG?

    This object should be indeed a nova, as reported in [vsnet-alert 977].
(http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-alert/msg00977.html)
No dwarf nova can show such a high (~3200 km/s) ejection velocity in emission
lines.  The observed width well corresponds to that of a fast nova.

    By assuming the optical maximum at the epoch of Liller's discovery,
your observation suggest t3 of 3 - 4 days (!), which probably rivals the
fastest nova, V1500 Cyg (Nova Cyg 1975, t3 = 3.6) and V838 Her (Nova Her
1991).  It would be probably interesting to search for any periodic
modulation during this nova eruption, since V1500 Cyg showed a remarkable
0.141-day modulation, which is interpreted as the "searchlight effect"
(cf. Stockman et al. ApJ 232, 282).  V838 Her is a neon nova, which showed
deep eclipses even during the early decay.  As usual, observations are
strongly recommended!

Regards,
Taichi Kato

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