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Three Cataclysmic Variables detected by MASTER

ATel #5749; O. Gress (Irkutsk State University), P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, 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 (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 9 Jan 2014; 22:59 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J070315.49+174811.8 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 07h 03m 15.49s +17d 48m 11.8s on 2014-01-07.62251 UT. The OT unfiltered magnitude is 17.5m (limit 18.1m). The OT is seen in 6 images. We have reference image without OT on 2011-12-26.81073 UT with unfiltered m_lim=19.3.

The OT at quiescence is identical to the blue star USNO-B1.0 1078-0161941 (07 03 15.479 +17 48 10.87 B2=21.14 R2=20.03 I=19.04). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Gemini is not covered by SDSS and GALEX.

Color-combined DSS finder chart: http://master.sai.msu.ru/static/OT/J070315+174811-BRIR5x5.jpg (2x zoom). The object was observed by Palomar/NEAT project 42 times on 15 nights from 2001 Mar. 09 to 2002 Oct. 04. It was in outburst on 2002 Oct. 03 and 04. Comparison of 2002 Feb. 06 and Oct. 03 NEAT images is posted at http://master.sai.msu.ru/static/OT/J070315+174811-NEAT-2002.jpg

MASTER OT J070315.49+174811.8 is a new cataclysmic variable (dwarf nova in outburst). Follow up observations are required. Discovery and reference images: http://master.sai.msu.ru/static/OT/070315.49174811.8.png

MASTER OT J133833.06+292908.4 - unusual CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 13h 38m 33.06s +29d 29m 08.4s on 2014-01-04.96686 UT. The OT unfiltered magnitude is 18.1m (limit 19.4m). The OT is seen in 6 images. We have reference image without OT on 2011-01-12.99704 UT with unfiltered m_lim=19.9.

The OT at quiescence is identical to the blue star USNO-B1.0 1194-0213143 (13 38 33.072 +29 29 08.75 pmRA=-32 pmDE=18 B1=20.95 R1=N/A B2=20.67 R2=19.55 I=19.27) = SDSS J133833.06+292908.5 (u=22.35 g=21.74 r=21.59 i=21.30 z=20.61). There is an UV counterpart GALEX J133833.0+292909 (FUV=20.27+/-0.26 NUV=20.39+/-0.18).

The star is included in the SEXSI Optical Spectroscopy Catalog (Eckart et al., ApJSS 165, 19, 2006) as CXOSEXSI J133833.0+292908. Spectrum obtained at R=20.1 shows a significant He II 4686 AA line. There is a large irregular variability from 21m to 18m in Catalina Sky Survey: CSS J133833.0+292908.

Follow up observations are required. Discovery and reference images: http://master.sai.msu.ru/static/OT/133833.06292908.4.png

MASTER OT J001436.25+503240.3 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 14m 36.25s +50d 32m 40.3s on 2014-01-08.64788 UT. The OT unfiltered magnitude is 16.2m (limit 18.9m). The OT is seen in 8 images. We have reference image without OT on 2012-09-19.74387 UT with unfiltered m_lim=19.6.

The OT is identical to the blue star USNO-A2.0 U1350.00269077 (00 14 36.31 +50 32 40.7 R=17.5 B=16.9) = USNO-B1.0 1405-0007222 (00 14 36.300 +50 32 40.50 B1=18.03 R1=17.53 B2=20.57 R2=20.13 I=17.03). It was in outburst on 1951 Sep. 09 POSS-I plates and 1995 Sep. 15 POSS-II infrared plate. Comparison of 1951-09-09 and 1953-10-02 blue Palomar plates is uploaded to http://master.sai.msu.ru/static/OT/J001436+503240-DSS-B-anim.gif and color-combined (BRIR) finder chart to http://master.sai.msu.ru/static/OT/J001436+503240-BRIR4x4.jpg (2x zoom).

The object has also an UV counterpart GALEX J001436.3+503239 (FUV=17.38+/-0.04 NUV=17.14+/-0.03). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Cassiopeia is not covered by SDSS and CRTS.

Based on the blue color and previous outbursts MASTER OT J001436.25+503240.3 is a dwarf nova of UGSU or UGSS type. Follow up observations are required. Discovery and reference images: http://master.sai.msu.ru/static/OT/001436.25503240.3.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net