(cba:news) CSS J174033.5+414756 outburst!
jop at astro.columbia.edu
Fri Aug 8 07:27:24 EDT 2014
This quite strange star is again in outburst. While it is possibly a
"short outburst" - without any definite model implies by this term! -
it's far too interesting to pass up. Let's jump on it right away!
My notes say that the preferred comparison stars (used last year) are:
JJ: 000-BKZ-140 (V=13.761)
EA: GSC 3096-1994 (V=13.441)
I even think that this is now the *top priority* target for northerners.
Much as I love V1494 Aql and all the great data you guys are getting,
I think this one is more important and time-critical now.
The novae can wait a little bit.
But - just to stay reasonably loyal to classical novae - I wanted to
endorse V4743 Sgr again (so far only Berto has observed it this year),
and also V1974 Cyg (pretty faint, so you might want to wait for good
-------- Original Message --------
From: Denis Denisenko <d.v.denisenko at gmail.com>
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Content-Type: text/plain; charset=UTF-8
Subject: [vsnet-alert 17610] CSS J174033.5+414756 outburst
This very unusual large amplitude (~7m) short-period (65-min) dwarf
nova in Hercules is in outburst! Last negative observation was a week
CSS J174033.5+414756 (ASASSN-13ae)
20140730.120 <142V C. Chiselbrook (AAVSO)
20140806.109 138V C. Chiselbrook (AAVSO)
20140806.993 13.98V J.-L. Gonzalez Carballo (AAVSO)
20140807.087 139V C. Chiselbrook (AAVSO)
20140807.157 13.77V J. O'Neill (AAVSO)
Light curve of CSS 130418:174033+414756 from Catalina Sky Survey:
Previous outbursts: 2013 Apr. 18 (discovery by CSS), 2007 May 15
(found post factum in CSS data). There was extensive observing
campaign in April-May 2013 following [vsnet-alert 15629]. The
photometric behavior (~50 days long superoutburst and evolution of
superhumps) plus presense of Hydrogen lines in spectra allowed to
classify the star as UGWZ dwarf nova. The period around 0.045d makes
it an extremely unusual object. Yet now we have an outburst just 15.5
months after the previous one!
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