[ Previous | Next | ADS ]

Flare Star and Cataclysmic Variable in Aquila detected by MASTER

ATel #6720; N. Tiurina, P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov (MASTER team members)
on 19 Nov 2014; 17:42 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J201449.73+015310.4 - flaring red dwarf

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 14m 49.73s +01d 53m 10.4s on 2014-11-12.65846 UT. The OT unfiltered magnitude is 18.3m (limit 20.2m). The OT is seen in 3 images. There is no minor planet at this place. The object has reached maximum on the second of three images (180-sec exposures): 15:48:12 UT, 18.33m; 15:51:44 UT, 17.85m; 15:55:12 UT, 18.17m. It has faded below the detection limit (19.6m) on the unfiltered images obtained at 2014-11-12.74751 UT (2 hours later).

The OT at quiescence is identical to the red star GSC 2.3.2 N1XV014781 (Fmag=20.17 Nmag=18.63) = AllWISE J201449.75+015310.3 (W1=16.47 W2=16.41). This area of sky in Aquila is not covered by SDSS. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J201449+015310-BRIR5x5.jpg (2x zoom). The object is not present in 2MASS, GCVS and AAVSO VSX.

Based on the red color and short flare duration, MASTER OT J201449.73+015310.4 is a new variable of UV Ceti type (flaring red dwarf). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/201449.73015310.4.png

MASTER OT J191450.99-113234.7 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 14m 50.99s -11d 32m 34.7s on 2014-11-13.62267 UT. The OT unfiltered magnitude is 15.9m (limit 18.2m). The OT is seen in 4 images. There is no minor planet at this place.

The OT at quiescence is identical to the blue star USNO-B1.0 0784-0560497 (19 14 50.98 -11 32 35.2 B2=15.99 R2=17.54). The star was in outburst on the 1983 July 12 blue plate and at quiescence on 11 other DSS plates. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J191451-113234-ORIR5x5.jpg (2x zoom). The object has an UV counterpart GALEX J191451.0-113235 (NUV=19.12+/-0.08). Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Aquila is not covered by SDSS, NEAT and Catalina Sky Survey.

Based on the blue color, amplitude of variability and previous outburst, MASTER OT J191450.99-113234.7 is a new cataclysmic variable (dwarf nova). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/191450.99-113234.7.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net