(cba:news) stars for late August

Joe Patterson jop at astro.columbia.edu
Wed Aug 19 07:13:24 EDT 2015


Dear CBAers,

We're done with V1315 Aquilae for the year (probably for several years) 
- and also done with CP Lac, whose light curve was really disappointing.

Here are my recommendations for northern targets this month:

1. WZ Sge.  Strangely, we've never done a campaign on this ultra-famous 
star in quiescence.  Serious oversight.  There's an intruder star 7 
arcsec away, so you have to figure out what to do about that (probably 
exclude it... depending on how good your drive is).  It's about 15.5, 
though it has a few excursions to 14.5, which would be awfully 
fascinating to catch in the act.

2. LS Peg. Good target for the smaller scopes - or for the bigger scopes 
when ambition is flagging.  1-2 minute integrations are fine (as are 
faster, if you prefer).

3. V1974 Cyg.  I think about 17.5 now.  We need another season's 
coverage to establish a good ephemeris extending back to the 1992 
eruption ("nova of the century"... and since they waited until 1992 to 
say so, they can't be accused of jumping the gun).

4. LQ Peg.  We've logged just one brief campaign.  Rude & Ringwald have 
presented some nice results, and it's time to put some intense effort 
into this star.  I'd rate it as about to equal to LS Peg in priority... 
but the first few nights will probably clarify this.

5. V1500 Cyg.  This is a 19th mag star, but if you like faint stars, 
this is your guy, with a 1-mag amplitude.  We're trying to pin down the 
exact period over the long haul (back to 1975), so just one or two good 
nights will be fine.

6. V Per = Nova Per 1889. You can't blame a guy for trying.  I think 
about 18.5 and eclipsing.  We want to know *everything* about this 
short-period eclipsing old nova, which importantly impact almost 
everything we do (the CBA, not the world).  Sorry about the magnitude, 
and I know it's wishful thinking, but I thought I'd give it a try.

As usual, the best observing practice is to adopt a star and stick to it 
- *density of observation* is very critical.  Until you don't like it 
any more - then adopt a different star.

In the south, there are three old novae I'd recommend.  They're all 
difficult targets (faintness and crowding) but would be great to study 
thoroughly: V728 Sco, V4743 Sgr, and V630 Sgr.  We have some data on all 
them, mainly from Gordon... just enough to whet my appetite.

Plus CD Ind, an asynchronous polar we're studying long-term (slow 
synchroniztion of rotational and orbital periods).  Good target, not faint.

The big T Pyx paper is almost complete. Attached is a draft of the 
paper, though really you should just pay close attention to the author 
list and the separate observing log.  (BTW the stuff at the back is pure 
gobbledygook.) I just would like them to be as accurate as possible - 
check 'em.  Also, most journals want both postal and email addresses for 
authors, so send 'em, if you haven't done so recently (and cc to 
Jonathan: jk at 155west.org)

joe
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