(cba:news) GW Lib at last...
jop at astro.columbia.edu
Thu Apr 12 09:55:31 EDT 2007
Rod Stubbings just reported that GW Lib, practically dormant since 1983,
is in outburst at 13.8. GW Lib had at least one previous short
outburst, and that's probably what this is. But it may also be the
beginning of a superoutburst... and if so, it's tremendously important.
And well placed in the sky too! At -25 degrees, it's even marginally
available for southern USA observers.
So it's absolute top priority now for (nearly) all observers, and worth
staying on until it arrives back at minimum (V=16.6, although catalogues
tend to assign it an incorrect V=18.5). That might come in just a few
days; or it could well be a few months! Even if it's just a short
outburst, it's still quite interesting: the only previous coverage of
short outbursts is a single image.
Here's Rod's message...
Gw Lib is in outburst.
LIBGW 070411.509 <157 Stu.RASNZ
LIBGW 070412.494 138 Stu.RASNZ
Re other objects, it's time to DROP DT Oct. YY Sex, AM CVn, and CR Boo
remain good targets. BZ UMa went into outburst a few days ago, and
CBAers jumped to attention pretty fast. I'm kinda torn about it. It's
true that BZ UMa is a strange star that stands well apart from other CVs
of short Porb; that makes it a very tempting target, very desirable for
study. On the other hand, we've gotten good coverage of a previous
outburst, and the star exhibited mainly erratic variability. So that's
one excellent reason to study it, and one fair reason not to. Excellent
trumps fair, so I guess it's a good evening target for you borealites.
I'll study the data and comment again soon.
Actually, I don't think I've received any yet. Can you send me the BZ
Happy observing! We're in a major extension of winter here in the
Northeast USA. Decently clear nights... but I didn't think I signed up
for all this springtime cold.
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