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New CV and Flare Star detected by MASTER

ATel #6006; S. Shurpakov, P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 24 Mar 2014; 18:01 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J230325.66+564914.5 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 23h 03m 25.66s +56d 49m 14.5s on 2014-03-22.79420 UT. The OT unfiltered magnitude is 15.9m (limit 17.4m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2014-03-21.79861 UT with unfiltered magnitude limit 17.2m.

The OT at quiescence is identical to the blue star USNO-B1.0 1468-0469738 (23 03 25.765 +56 49 16.71 B1=20.59 R1=18.71 B2=18.51 R2=18.04 I=17.01). Object is showing large variability on the digitized Palomar plates. It was faint on 1953 Oct. 29 POSS-I exposures, bright on POSS-II blue plate of 1989 Sep. 24 and Quick-V plate of 1983 July 08 (Vmag=16.62 in GSC 2.3.2). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J230325+564914-BRIR5x5.jpg (2x zoom). There is also an IR counterpart 2MASS J23032578+5649164 (J=15.99+/-0.10 H=15.34+/-0.13 K=15.44+/-0.19). There is nothing at this position in 1RXS, GCVS and AAVSO VSX. This area of sky in Cassiopeia is not covered by SDSS and CRTS.

Based on the blue color and amplitude of variability, MASTER OT J230325.66+564914.5 is a new cataclysmic variable, most likely a dwarf nova in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/230325.66564914.5.png

MASTER OT J134725.44-155854.6 - new UV Ceti star

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 13h 47m 25.44s -15d 58m 54.6s on 2014-03-22.97177 UT. The OT unfiltered magnitude is 17.5m (limit 18.2m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2014-02-05.07275 UT with unfiltered magnitude limit 18.7m. The object was quickly fading: 2014-03-22.971 UT, 16.9m; 22.972, 17.5m. It was not detected on the first triplet of images taken 1.1 hr before (on 2014-03-22.924 UT) to 18.2m.

The OT at quiescence is identical to the red star USNO-B1.0 0740-0271011 (13 47 25.379 -15 58 53.88 R1=19.64 I=18.06) = 2MASS J13472540-1558541 (J=16.15+/-0.09 H=15.27+/-0.08 K=15.35+/-0.18). There is nothing at this position in 1RXS, GCVS and AAVSO VSX. Based on the fast rise and fading, MASTER OT J134725.44-155854.6 is a flaring red dwarf. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/134725.44-155854.6.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net