Two bright new CVs detected by MASTER
ATel #4506; D. Denisenko, E. Gorbovskoy, V. Lipunov, P. Balanutsa, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov, P. Podvorotny, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 22 Oct 2012; 08:21 UT
Credential Certification: Vladimir Lipunov (firstname.lastname@example.org)
Subjects: Cataclysmic Variable
MASTER OT J081110.46+660008.5 - new bright CV with outburst amplitude 8m
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) =
08h 11m 10.46s +66d 00m 08.5s on 2012-10-20.79277 UT.
The OT unfiltered magnitude is 14.1m (limit 18.9m). The OT is seen in
2 images. There is no minor planet at this place.
We have reference image without OT on 2011-10-07.76701 UT with
unfiltered magnitude limit 18.5m.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/081110.46660008.5.png
The OT is identical to the star SDSS
J081110.43+660010.3 with the following magnitudes: u=22.42 g=22.07
r=22.11 i=22.16 z=22.26. The new variable has also an UV counterpart
with two entries in GALEX catalog: GALEX J081110.7+660013
(FUV=21.31+/-0.49 NUV=20.84+/-0.26) and GALEX J081110.8+660013
(FUV=21.71+/-0.48 NUV=21.18+/-0.29). The star is showing variability
on blue Palomar plates. According to USNO-B1.0, it had B=18.98 on
1955-01-28 POSS-I plate and B=20.51 on 1997-02-05 POSS-II plate.
Nothing is present at this position in GCVS and AAVSO VSX. No previous
outbursts were detected by Catalina Sky Survey. This area was not
covered by NEAT. The comparison of MASTER-Amur, DSS red and SDSS color
images is uploaded to http://master.sai.msu.ru/static/OT/081110.4+660008.jpg
Based on the outburst amplitude and blue color (SDSS g-r=-0.04,
r-i=-0.05) we conclude that MASTER OT J081110.46+660008.5 is a new
cataclysmic variable, most likely a dwarf nova of WZ Sge (UGWZ) type.
Follow up observations are required.
MASTER OT J182122.64+283211.4 - new CV
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 18h 21m 22.64s +28d 32m 11.4s on 2012-10-21.43522 UT.
The OT unfiltered magnitude is 16.0m (limit 18.4m).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image without OT on 2012-08-21.62466 UT with unfiltered magnitude limit 18.8m.
There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS
and GCVS catalogs as well as in AAVSO VSX. No previous outbursts were
detected on 9 images obtained by Palomar/NEAT
during 3 different nights in 1997-1998. This area is not covered by
SDSS, GALEX and CSS.
There is a faint star (magnitude ~21) on blue Palomar plates obtained
on 1951-07-10 and 1990-07-22. Comparison of POSS-I and POSS-II plates
is posted at http://master.sai.msu.ru/static/OT/J182122+283211-anim-DDS-B.gif
The galactic latitude is +19 deg. Based on the amplitude of
variability we suggest that MASTER OT J182122.64+283211.4 is likely a
new cataclysmic variable (dwarf nova) in outburst. Follow up
observations are encouraged.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/182122.64283211.4.png
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