(cba:news) MASTER OT J094759.83+061044.4 - bright UGSU candidate, and other May stars

Joe Patterson jop at astro.columbia.edu
Sun May 5 07:07:55 EDT 2013

Dear CBAers,

This looks like a good one for us - bright enough to follow for a while, 
and bright enough to eventually study (with big glass) the properties in 
quiescence.  Not the best of sky positions, but we should be able to 
break aliases with a good longitude spread.

And in the morning sky, I should - better late than never I guess - 
strongly endorse CSSJ174033.5+414756, another decently bright star (14?) 
showing 60 min superhumps.  60 minutes sort of makes you a law-breaker 
in the world of superhumps - too short for the usual family, and too 
long for the helium stars.  There are excuses one can make for such 
oddities, but they're a tad strained.  Let's observe the star heavily 
and figure it out!  Here's the CSS link:


Then there's NR TrA, a "young old nova" - remnant of Nova TrA 2008. 
Fred Walter alerted me to this star, and Josch Hambsch has just finished 
a month-long time series on it, showing its 5.2 hour eclipses (or 
periodic dips, anyway).  Although the data are substantial, they suffer 
from lack of longitude coverage (everything is from Chile) and also lack 
of time resolution.  The star is easily bright enough to get some great 
data from South Africa and New Zealand.  The field is kinda crowded, so 
study it first.

I've about finished with that big Pdot study of DQ Hers, which I've been 
working on practically since the Chicago Cubs last won the World Series. 
  One star of special importance is V1223 Sgr, which seemed to show 
steady period increase during 1981-2007.  It's the only star doing 
that... and I want to bring it up to date in 2013.  It's bright (13.5) 
and has a fast period (13.5 min, for that matter), so it should be easy.



Just published in ATel #5049, 
New Bright CV detected by MASTER

MASTER OT J094759.83+061044.4 - new bright CV in Sextans
   20130504.761  13.6CR  MASTER-Kislovodsk
   20130504.793  13.6CR  MASTER-Kislovodsk

Other IDs:
SDSS J094759.82+061043.8 (u=20.04 g=20.42 r=20.19 i=20.27 z=20.26)
USNO-B1.0 0961-0183897 (09 47 59.811 +06 10 44.50 pmRA=-6 pmDE=18
B1=19.30 B2=20.33 R2=19.58 I=18.67)
GALEX J094759.8+061044 (FUV=20.18+/-0.06, NUV=20.15+/-0.04)
GALEX J094759.8+061043 (FUV=19.91+/-0.13, NUV=20.22+/-0.10)

Two previous (but fainter) outbursts were detected by CSS on 2005 May
30 (15.8m) and 2006 Dec. 12 (15.3m).

This variable is in Top 10 of brightest CVs discovered by MASTER. It
is located well for the observers in both hemispheres, being an
evening object. SDSS colors and outburst amplitude (~6m) definitely
say in favour of SU UMa-type dwarf nova in superoutburst.
Time-resolved photometry is strongly encouraged.

Discovery and reference images by MASTER-Kislovodsk:

Denis Denisenko
Member of MASTER team at SAI MSU

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