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(cba:news) GW Lib at last... (Joe Patterson) [2007-04-12T13:55:32Z]



Dear CBAers,

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

Regards,
Rod Stubbings
_________________________________

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 UMa data?

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.

joe