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MASTER Discovery of Two Cataclysmic Variable Candidates

ATel #6847; S. Shurpakov, P. Balanutsa, V. Lipunov, N. Tiurina, E. Gorbovskoy, D. Denisenko, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov (Lomonosov Moscow State University, SAI), 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), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov (MASTER team member)
on 23 Dec 2014; 23:50 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J072048.67+171051.9 - possible new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 07h 20m 48.67s +17d 10m 51.9s on 2014-12-21.726 UT. The OT unfiltered magnitude is 18.0m (limit is 20.0m). The OT is seen at 5 images. There is no minor planet at this place. We have reference image without OT on 2011-12-01.769 UT with unfiltered magnitude limit 20.4m.

There is nothing at this position in any catalogs and on the digitized Palomar plates to limiting magnitude ~22. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J072048+171051-BRIR5x5.jpg (2x zoom). This area of sky in Gemini is not covered by SDSS and Catalina Sky Survey. NEAT project has 56 images on 16 nights from 2001 Mar. 11 to 2002 Oct. 04. No previous outbursts were detected.

MASTER OT J072048.67+171051.9 is likely a new cataclysmic variable (dwarf nova in outburst). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/072048.67+171051.9.png

MASTER OT J055152.63+402118.6 - possible new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 05h 51m 52.63s +40d 21m 18.6s on 2014-12-22.766 UT. The OT unfiltered magnitude is 16.8m (limit is 18.6m). The OT is seen in 8 images. There is no minor planet at this place. We have reference image without OT on 2011-12-27.712 UT with unfiltered magnitude limit 19.5m.

The OT at quiescence is identical to the blue star USNO-B1.0 1303-0146452 (B1=20.09 R1=19.27 B2=20.52 R2=20.01). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J055152+402118-BRIR5x5.jpg (2x zoom). Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Auriga is not covered by SDSS and Catalina Sky Survey. No previous outbursts were detected by NEAT project on 3 nights from 2001 Dec. 20 to 2002 Feb. 02.

Based on the blue color and amplitude of variability, MASTER OT J055152.63+402118.6 is likely a new cataclysmic variable (dwarf nova in outburst). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/055152.63+402118.6.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net