Two new CVs detected by MASTER

ATel #5618; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), 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 Pulkovo Observatory), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 2 Dec 2013; 07:33 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J143550.11+592134.8 - new bright CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 14h 35m 50.11s +59d 21m 34.8s on 2013-11-30.44094 UT. The OT unfiltered magnitude is 15.2m (limit 18.5m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2012-01-02.82788 UT with unfiltered magnitude limit 19.9m.

The OT at quiescence is identical to the blue star SDSS J143550.04+592134.6 (u=20.11 g=20.28 r=20.27 i=20.19 z=20.13). It is present in catalogs as USNO-A2.0 1425-08149469 (B=19.3 R=19.3) and USNO-B1.0 1493-0220198 (B1=20.11 R1=19.73 B2=20.70 R2=19.90). There is also an UV counterpart GALEX J143550.1+592134 (FUV=20.43+/-0.22, NUV=20.42+/-0.12).

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Draco is not covered by CRTS. There is no detection in radio or gamma-rays. The proposed classification as a quasar is definitely not valid.

Based on the blue color and outburst amplitude (~5m), MASTER OT J143550.11+592134.8 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/143550.11592134.8.jpg

MASTER OT J080541.63+640145.5 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 08h 05m 41.63s +64d 01m 45.5s on 2013-12-01.74199 UT. The OT unfiltered magnitude is 16.2m (limit 19.3m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-01-02.75900 UT with unfiltered magnitude limit 19.9m.

There is a faint star within 1" of the OT visible on blue Palomar plates. It is present in GSC 2.3.2 with the coordinates 08 05 41.769 +64 01 44.49 and jmag=21.80. Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J080541+640145-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J080541.4+640144 (NUV=21.80+/-0.48).

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. No outbursts were detected by CRTS. This area of sky in Camelopardalis is not covered by SDSS and NEAT.

Based on the blue color and outburst amplitude (~5.5m), MASTER OT J080541.63+640145.5 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/080541.63640145.5.jpg

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