Two bright new CV candidates detected by MASTER

ATel #4488; D. Denisenko, P. Podvorotny, 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, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 16 Oct 2012; 07:40 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J024414.72+413413.5 - new CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 02h 44m 14.72s +41d 34m 13.5s on 2012-10-12.63367 UT. The OT unfiltered magnitude is 16.1m (limit 18.4m). The OT is seen in 2 image. There is no minor planet at this place. We have reference image without OT on 2011-09-06.80799 UT with magnitude limit in 'V' filter 19.0m. There is a faint blue object (magnitude ~21.5) within 1" from the position of the OT visible on POSS-II plates. The object appears slightly diffuse. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J024414+413413-BRIR.jpg (10'x10' FOV).

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, GALEX, 1RXS and GCVS catalogs and in AAVSO VSX. No previous outbursts were detected by NEAT and CSS. This area is not covered by SDSS.

The galactic latitude is -16.5 deg. Based on the amplitude of variability we suggest that MASTER OT J024414.72+413413.5 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/024414.72413413.5.png

MASTER OT J001952.31+464933.0 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 19m 52.31s +46d 49m 33.0s on 2012-10-15.84042 UT. The OT unfiltered magnitude is 16.8m (limit 21.0m). The OT is seen in 3 images. We have reference image without OT on 2010-10-25.91015 UT with unfiltered magnitude limit 20.1m.

There is a faint blue star at the position of the OT on POSS-II plates (brighter on 1993-11-08 than on 1989-09-28). It is present in GSC 2.3.2 catalog with coordinates 00 19 52.346 +46 49 32.96 and jmag=21.29. There is nothing at this position in USNO-B1.0, 2MASS, 1RXS and GCVS catalogs. This area is not covered by SDSS, GALEX, CSS and NEAT.

The galactic latitude is -16 deg. Based on blue color and amplitude of variability we conclude that MASTER OT J001952.31+464933.0 is a cataclysmic variable (dwarf nova) in outburst.

Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J001952+464933-BRIR.jpg (10'x10' FOV).

MASTER-Amur observed this area of sky 5 nights ago. Nothing was visible at the position of MASTER OT J001952.31+464933.0 on 2012-10-10.615 and 2012-10-10.647 UT to limiting magnitude 19.5.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/001952.31464933.0.png

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