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
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
