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Significant increase in the optical brightness of V2492 Cyg

ATel #10170; Sunay Ibryamov (Department of Theoretical and Applied Physics, Faculty of Natural Sciences, University of Shumen, Bulgaria), Evgeni Semkov (Institute of Astronomy and NAO, Sofia, Bulgaria)
on 14 Mar 2017; 17:11 UT
Credential Certification: E. Semkov (esemkov@astro.bas.bg)

Subjects: Optical, Variables, Young Stellar Object, Pre-Main-Sequence Star

Referred to by ATel #: 10183, 10259

We observed a recent increase in the optical brightness of the young eruptive star V2492 Cyg using the 2-m and the 50/70-cm Schmidt telescopes administered by National Astronomical Observatory Rozhen in Bulgaria. The current brightness of the object significantly exceeds the registered maximal magnitudes after 2010.

V2492 Cyg is located in the Pelican Nebula and its variability and first outburst in 2010 was reported by Itagaki and Yamaoka (CBET #2426), Munari et al. (CBET #2428), Covey et al. (2011, AJ, 141, 40). The nature of the outbursts occurred in V2492 Cyg is still controversial. The object shows consecutive increases and dips in brightness within last seven years. According to Hillenbrand et al. (2013, AJ, 145, 59) both accretion- and extinction-driven mechanisms are responsible for the source variability.

The measured BVRI magnitudes of V2492 Cyg during 2016 November - 2017 March, are summarized in the Table below. The table contains date and Julian date of observations, BVRI magnitudes of the object, and telescope used. Typical errors of the reported magnitudes are 0.01-0.02 mag for the I- and R-band data, and 0.01-0.03 mag for the V- and B-band data.

Date (DD.MM.YYYY)   J.D.     B     V     R     I     Telescope
   05.11.2016    2457698.260   16.31   14.63   13.49   12.21   Schmidt
   21.11.2016    2457714.222   15.97   14.25   13.21   11.89   2-m
   22.11.2016    2457715.204   15.85   14.27   13.16   11.87   2-m
   23.11.2016    2457716.215   16.19   14.44   13.38   11.97   2-m
   02.01.2017    2457756.202   15.62   13.96   12.83   11.54   Schmidt
   17.02.2017    2457801.603   15.28   13.67   12.57   11.40   Schmidt
   05.03.2017    2457817.549   15.11   13.52   12.51   11.37   Schmidt