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Three new CVs by MASTER

ATel #5758; V. Vladimirov, S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), 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 13 Jan 2014; 19:15 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J202315.58+741752.1 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 23m 15.58s +74d 17m 52.1s on 2014-01-08.70432 UT. The OT unfiltered magnitude is 17.6m (limit 18.3m). The OT is seen in 5 images. There is no minor planet at this place.

There is nothing at this position in any catalogs. This area of sky in Draco is not covered by SDSS, NEAT and CRTS. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J202315+741752-BRIR5x5.jpg (2x zoom).

MASTER OT J202315.58+741752.1 is likely a cataclysmic variable. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/202315.58741752.1.png

MASTER OT J173825.36+173255.1 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 17h 38m 25.36s +17d 32m 55.1s on 2014-01-12.13206 UT. The OT unfiltered magnitude is 16.1m (limit 17.8m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-08-31.74088 UT with unfiltered magnitude limit 19.8m.

There is nothing at this position in any catalogs. This area of sky in Hercules is not covered by SDSS. There are 41 Palomar/NEAT observations on 13 different nights from 1998 Aug. 20 to 2005 Aug. 30. Object is not visible on any images. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J173825+173255-BRIR5x5.jpg (2x zoom).

Based on the outburst amplitude (more than 5m), MASTER OT J173825.36+173255.1 is most likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/173825.36173255.1.jpg

MASTER OT J004951.91+512641.4 - new CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 00h 49m 51.91s +51d 26m 41.4s on 2014-01-12.41072 UT. The OT unfiltered magnitude is 17.5m (limit 17.9m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2012-09-24.70219 UT with unfiltered magnitude limit 19.2m.

The OT at quiescence is identical to the star USNO-A.20 1350-00841053 (00 49 51.81 +51 26 41.3 R=18.5 B=19.5) = USNO-B1.0 1414-0024611 (00 49 51.815 +51 26 41.30 B1=20.45 R1=N/A B2=18.81 R2=19.14 I=17.29). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J004951+512641-BRIR5x5.jpg (2x zoom). Object is showing large variability on blue DSS plates.

There is nothing at this position in 1RXS, GALEX, 2MASS, GCVS and AAVSO VSX. This area of sky in Cassiopeia is not covered by SDSS, NEAT and CRTS.

Based on the amplitude of variability (~3m), MASTER OT J004951.91+512641.4 is likely a cataclysmic variable. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/004951.91512641.4.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net