Sziasztok!

Denis Denisenko hivta fel a Vinko Jozsiék által felfedezett,
törpenóva-gyanús csillagra, amely három hete (aug. 30-án) még 14 magni
körüli volt, majd szept. 14-re 16,1 magnitúdóig halványodott. Amennyiben
UGWZ típusú csillag, az elkövetkező napokban még kisebb
visszafényesedések is elképzelhetők.

üdv:

Fidusz

* * *

Date: Mon, 19 Sep 2011 20:30:46 +0400
From: Denis Denisenko
Subject: [vsnet-alert 13679] New CV in Camelopardalis (ATel 3651)

J. Vinko et al. report in Astronomer´s Telegram (ATel) #3651 on the
discovery by ROTSE-IIIb of a probable new cataclysmic variable in
Camelopardalis which was ~14m three weeks ago (on Aug. 30) and faded
to ~16.1 by Sep. 14.

The new object is designated ROTSE3_J034450.8+683753 by the authors,
and the coordinates are reported to be uncertain by ~1":

03 44 50.8 +68 37 53

The full text of ATel follows.  Please note that the "faint USNO-B
source" mentioned in the Telegram is formally 9" away (due North) from
the new variable, thus likely not related to it.  (I would even say it
is definitely not related to the new CV, being too red).
Unfortunately the star is not present either in GALEX UV or in 2MASS
IR catalogs.  But there is indeed some faint blue star marginally
visible on the POSS-II plates at the reported position.  I have
uploaded 10´x10´ color-combined (BRIR) chart centered at new variable
with its position marked with dashes here:
http://hea.iki.rssi.ru/~denis/J0344+6837-BRIR.jpg

The star appears to have at least a 7-mag outburst amplitude.  Taken
together with a long outburst duration it might suggest an UGWZ
superoutburst with possible rebrightenings.  Thus, it may be worth of
the follow-up, even though it´s been monitored with ROTSE-III
telescopes.

Denis Denisenko

http://www.astronomerstelegram.org/?read=3651

J. Vinko (University of Szeged) et al. on behalf of the ROTSE collaboration

We report the discovery of a new transient (mag ~14.9) in unfiltered
images taken on Aug. 29.39 UT with the 0.45-m ROTSE-IIIb telescope at
McDonald Observatory. The transient has brightened to mag ~14.0 on
Aug. 30.42 then started to decay gradually in the following weeks with
mag ~15.3 on Sep. 7.38 and mag ~16.1 on Sep. 14.37. The new object is
located at R.A. = 03h44m50s.76, Decl. = +68o37´52".9 (equinox 2000.0;
uncertainty about 1"). A finding chart for the object can be found at
website URL: http://www.rotse.net/rsvp/j034450.8+683753/ROTSE3_J034450.8+683753.jpg
A faint source is present at the position of the transient on the
POSS-II images with USNO B1.0 magnitudes R=19.77 and I=18.85. A
spectrum obtained with the 9.2-m Hobby-Eberly Telescope (+Marcario
Low-Resolution Spectrograph, R ~ 600) by J. Caldwell on 2011. Sept.
1.46 UT shows narrow absorption features, including Na-D, H-beta and
H-gamma at zero redshift, superimposed on a smooth blue continuum.
H-alpha is filled up by an emission component, but does not extend
above the continuum. A second spectrum obtained on Sept. 17.42 UT by
S. Rostopchin has the same overall appearance, but with flatter,
redder continuum slope. The spectroscopic observations together with
the identification of a stellar-like source at this position, suggest
that the transient is galactic, probably an outburst of a cataclysmic
variable. Monitoring with the ROTSE-III telescopes is continuing.


----- End forwarded message -----