From jop at astro.columbia.edu Mon Mar 2 15:30:48 2015 From: jop at astro.columbia.edu (Joe Patterson) Date: Mon, 02 Mar 2015 15:30:48 -0500 Subject: (cba:news) stars for march 2015 Message-ID: <54F4C878.20900@astro.columbia.edu> Attached. -------------- next part -------------- A non-text attachment was scrubbed... Name: stars315.pdf Type: application/pdf Size: 32558 bytes Desc: not available URL: -------------- next part -------------- ____________________________________________________________ Center for Backyard Astrophysics (CBA) mailing lists https://cbastro.org/communications/mailing-lists/ From jop at astro.columbia.edu Sat Mar 28 20:29:45 2015 From: jop at astro.columbia.edu (Joe Patterson) Date: Sat, 28 Mar 2015 20:29:45 -0400 Subject: (cba:news) UX UMa, RW Sex, and V842 Cen Message-ID: <55174779.900@astro.columbia.edu> Hi CBAers, It seems likely that UX UMa is exhibiting negative superhumps, along with the "nodal" signal that frequently accompanies it. This is a major discovery in a star long thought to be well-understood - and the prototype for one type of CV. Our coverage does suffer from some gaps, though, and it would be great if we could get excellent data over the next week or two. Especially excellent in longitude coverage, since the periods are kinda long: ~5 hours and ~4 days. And as long as UX UMa is going to show superhumps, let's try for RW Sex as well - the other very bright "UX UMa star" in the sky this month. Both hemispheres OK for this one, and I recommend a V filter since there are plenty of photons available. But the BEST southern target now is V842 Cen, the remnant of Nova Cen 1986 #2. Alleged to be a DQ Her star (56 seconds) and also a negative superhumper (~4 hr). These are things we can definitely test. I'll leave it up to Enrique to decide when to end the campaigns on DW UMa and VZ Sex. Still got a broken hand/wrist, and rehabbing from hip surgery (so far, so good). joe p ____________________________________________________________ Center for Backyard Astrophysics (CBA) mailing lists https://cbastro.org/communications/mailing-lists/