Three New CVs detected by MASTER

ATel #5973; V. Yecheistov, S. Shurpakov, P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, 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, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (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), P. Podvorotny, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 12 Mar 2014; 13:00 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J185957.16+354224.3 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 18h 59m 57.16s +35d 42m 24.3s on 2014-03-10.00759 UT. The OT unfiltered magnitude is 16.2m (limit 18.4m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2010-04-25.02132 UT with unfiltered magnitude limit 19.7m.

There is a faint blue star at this position on digitized Palomar plates. It is present in GSC 2.3.2 with the following coordinates and magnitudes: 18 59 57.205 +35 42 25.03 jmag=21.75 V=18.07. The star was in outburst on two 1982-05-22 Quick-V plates and at quiescence on other plates. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J185957+354224-BRIR5x5.jpg (2x zoom). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Lyra is not covered by SDSS, NEAT and CRTS.

Based on the amplitude of variability (~5m), MASTER OT J185957.16+354224.3 is a new cataclysmic variable, most likely a dwarf nova of UGSU (SU UMa) type in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/185957.16354224.3.jpg

MASTER OT J185046.27+272044.1 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 18h 50m 46.27s +27d 20m 44.1s on 2014-03-10.02334 UT. The OT unfiltered magnitude is 17.5m (limit 18.7m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-07-20.80377 UT with unfiltered magnitude limit 19.7m.

There is a faint object at this position on digitized Palomar plates. It is not present in any catalogs. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J185046+272044-BRIR5x5.jpg (2x zoom). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Lyra is not covered by SDSS, NEAT and CRTS.

MASTER OT J185046.27+272044.1 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/185046.27272044.1.jpg

MASTER OT J194443.38+005637.4 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 44m 43.38s +00d 56m 37.4s on 2014-03-10.07097 UT. The OT unfiltered magnitude is 15.8m (limit 17.5m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-06-22.86828 UT with unfiltered magnitude limit 18.7m.

There is a blue star at this position on digitized Palomar plates. It is present in USNO-B catalogue with the following coordinates and magnitudes: USNO-B1.0 0909-0467658 (19 44 43.411 +00 56 37.98 B1=N/A R1=18.69 B2=17.55 R2=N/A I=N/A). The star is showing large variability on Palomar plates. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J194443+005637-BRIR5x5.jpg (2x zoom). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Aquila is not covered by SDSS, NEAT and CRTS.

Based on the amplitude of variability (~5m), MASTER OT J194443.38+005637.4 is a new cataclysmic variable, most likely a dwarf nova of UGSU (SU UMa) type in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194443.38005637.4.jpg

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