[vsnet-chat 383] Re: [vsnet-alert 981] possible nova in Sco

[Fraser Farrell <fraserf@dove.net.au>]

G'day all,

I 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?

Taichi Kato replied:
   >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.

Message 977 was in the _next_ batch of email...

   >By assuming the optical maximum at the epoch of Liller's discovery,
   >your observation suggest t3 of 3 - 4 days (!), which probably

Or eclipses???

   >rivals the fastest nova, V1500 Cyg (Nova Cyg 1975, t3 = 3.6) and
   >V838 Her (Nova Her 1991).  It would be probably interesting to

Liller's previous discovery (Nova Cru 1996) faded rapidly too.  We must
encourage Bill to find us some slower novae, so that we _all_ get a
chance to see them... <g>

Weather has turned cloudy and the forecast is not encouraging.  That
observation may be my only one of Nova Sco 1997 :(


The VSNET GIF image CHT3.GIF is a wide-field CCD picture?  When was this
taken?  The pixel at (322,202) corresponds to the nova's position, and
it seems to confirm the rapid fade.  I identify the brighter pixels
to the lower left (315,204) as a trio of GSC stars.



cheers,
Fraser Farrell

http://vsnet.dove.net.au/~fraserf/   email: fraserf@dove.net.au
traditional: PO Box 332, Christies Beach, SA  5165, Australia

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