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MASTER Detection of a New Cataclysmic Variable

ATel #6913; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, A. Rufanov, V. Vladimirov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, O. Gress, V. Poleshchuk, E. Konstantinov (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), D. Buckley, S. Potter, A. Kniazev, M. Kotze (SAAO), V. Shumkov, S. Shurpakov (MASTER team members)
on 13 Jan 2015; 21:16 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J002253.29+134041.0 - new active CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 22m 53.29s +13d 40m 41.0s on 2015-01-13.72456 UT. The OT unfiltered magnitude is 17.1m (limit 19.8m). The OT is seen in 9 images. There is no minor planet at this place. We have reference image without OT on 2010-11-06.79376 UT with unfiltered magnitude limit 20.4m.

The OT at quiescence is identical to the blue star SDSS J002253.21+134040.6 (g=20.29 r=20.13 i=19.55) = USNO-A2.0 0975-00079305 (00 22 53.18 +13 40 40.4 R=18.0 B=17.9) = USNO-B1.0 1036-0003917 (B1=19.18 R1=18.25 B2=19.82 R2=20.10 I=18.35) with a detectable proper motion between the 1st and 2nd epoch Palomar plates. There is also an UV counterpart with two entries in GALEX data: GALEX J002253.2+134041 (FUV=19.69+/-0.12, NUV=20.52+/-0.13) and GALEX J002253.1+134040 (FUV=20.46+/-0.06, NUV=20.95+/-0.07). The negative (FUV-NUV) color index is remarkable. The object is not present in 1RXS, 2MASS, GCVS and AAVSO VSX.

The star is showing large-amplitude variability (~18.0-20.5m) between the outbursts, see the light curve of CSS J002253.2+134041. We conclude that MASTER OT J002253.29+134041.0 is a new cataclysmic variable. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/002253.29134041.0.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net