[vsnet-alert 8800] Nova alert
wliller at compuserve.com
Sat Jan 21 01:17:10 JST 2006
Hola Everyone -
No, I do not have a new candidate, but I do want to send this message to
any of you who have not been following the machinations of the strange Nova
In brief, after reaching, on Nov 26, approximately V =11.5 (TP film, no
filter), it faded in just a few days' time to almost V =13.0. Then a week
later it had climbed back to V = 12.1 after which it was off on a slow and
irregular decline -- 24 days -- to V = 14.05 on Dec 30.7. Since then it
brightened again reaching V = 12.51 on Jan 10.4. However, the last two
observations, show it fading slowly: on Jan 15 at V = 13.0 and last night
at V = 13.17.
I have been sent several time series: they all show irregular variations on
the order of one- or two-tenths of a magnitude, and during a run on Jan 10,
the fluctuations became quite rapid with changes of 0.15 mags in about 45
seconds. This behavior continued for a little more than a half hour.
The main observers are Bill Allen of NZ, and in Australia, Giorgio Di Scala
and Bernard Heathcote. All three are first-rate CCD photometrists who have
been using check stars and standardized equipment. They can be trusted, I
There is no obvious periodicity to these fluctuations, but a detailed
anaysis is needed. Perhaps most important would be spectral observations
both from the ground (CTIO?) and from space (Spitzer?).
I will certainly let you know if anything more dramatic occurs.
All the best to all, Bill Liller
More information about the vsnet-alert