(cba:news) ASAS-SN 2013/08/29 Transients Update: Bright CV Candidate ASASSN-13ck

Joe Patterson jop at astro.columbia.edu
Thu Aug 29 10:11:21 EDT 2013

Detection form ASAS and Kris Stanek.  This is an 8-magnitude range, 
decently bright (therefore likely nearby, around 400 pc)... and it 
*just* erupted.  So it certainly looks like a tempting target.  Great 
sky position up there in Pisces, available to all hemispheres and 
practically all hours of the night.

Fire away, with the usual CBA weaponry.


For the last few years I've been lukewarm to discoveries of new dwarf 
novae in eruption.  The reason is that we already have decent 
information on ~150 of them... and thus to make a strong impact on 
current knowledge, we might expect to need ~150 more.  (That's a 
commonly cited rule of thumb.)  Nevertheless, there are a couple of 
reasons why this ho-hum reaction might be inappropriate:

1. We might be wrong.  Science's golden rule: eschew hubris!
2. The extreme dwarf novae, more or less the "WZ Sge class" with a 
magnitude range >7 mag, are very poorly understood and very hard to get 
data on, since they erupt very seldom and become very faint in 
quiescence.  And they're *probably* the most common type of CV, even 
though few are known (because they're so extremely bashful).  So we need 
to study every one that jumps up and says boo.


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Object                   RA (J2000)    DEC (J2000)  Disc. Date     V mag
ASASSN-13ck 	          0:11:33.71 	4:51:23    2013-08-29.47   12.93

Bright CV candidate, matches to a blue g=20.8 SDSS star; nothing there on

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