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(cba:news) stars for may (Joe Patterson) [2008-05-06T12:04:24Z]



Dear CBAers,

The flowers are blooming, the Red Sox are in first place, U Sco is ready for an outburst, the DQ Her ephemerides are under control. Even the fleas are back. It must be a new season... and time for a wholesale change of targets.

Barring a dramatic eruption, I'd like to take advantage of the new moon and focus on some pretty faint stars now. In particular:

1. GW Lib. This is still slowly declining, I think, from its 2007 eruption... but is probably about 16.3 now. Manageable in decent weather. It has never been observed in a fresh postoutburst state, and there are a host questions: is there an orbital signature? are the white-dwarf pulsations back? and what about the strange 2.1 hour photometric signal (that still defies explanation)? This is an IDEAL target for southern observers at all longitudes - and as long as possible each night, to distinguish among aliases and to increase resolution. It's also good for ambitious observers in the southern USA (Tom, you know who you are), since that's a critical longitude.

2. SDSS1238-03 (Vir). No eruption, but we had good luck tracking the 8-hr variation in 2006, and it too remains a mysterious beast since Porb is known to be very short. For southerners, this mostly conflicts with GW Lib, so take one and stick with it. It's a little fainter, about 17.5... but the variations are likely bigger. Good for all latitudes, though!

3. Oph (1730-05). A favorite DQ Her star newly arrived in the sky. V=16, can be a quasi-backup target.

4. SDSS1502+33 (Boo). A deeply eclipsing star V=17.6. See if you can get it; a faint-limit test for northern observers.

5. SDSS0804+51 (Lyn). Still available as an evening target for northerners. Need some more pulse timings.

6. Finally, WX Cen (1312-63). Bright-star backup for southerners. We need another season to complete a period study. Pretty nice photometric wave.

Meeting notes:

* the Big Bear meeting is coming up over Memorial Day weekend. I won't be there but there's usually a CBA contingent (Jerry Foote and Bob Koff are regulars).

* I will attend the early-January meeting in Hawaii, and hope to see some of you.

* And next year is an AAVSO meeting which I'm likely to declare as a CBA meeting also. See AAVSO site for details.

*Also, Tonny and Bart, could you give a report on the BAA-AAVSO meeting in April?

Happy observing!

joe