Rebrightening of V1047 Cen (Nova Cen 2005)
ATel #12876; P. Mroz, A. Udalski (Warsaw U. Observatory), on behalf of the OGLE team
on 18 Jun 2019; 20:39 UT
Credential Certification: Przemek Mroz (pmroz@astrouw.edu.pl)
Subjects: Optical, Cataclysmic Variable, Nova
Delgado et al. (TNS #37576) reported the discovery of an astronomical transient AT2019hik/Gaia19cfn possibly associated with V1047 Cen (Nova Cen 2005).
This object is located in the Galactic disk field GD1272 that is regularly monitored by the OGLE-IV Survey. Its equatorial coordinates (RA = 13:20:49.78, Decl. = -62:37:50.6, J2000) are consistent with those of the classical nova V1047 Cen (Nova Cen 2005; IAUC # 8596 ).
During the years 2013-2018, the star had a mean magnitude of I = 17.12 +/- 0.10 mag and color (V-I) = 0.38 +/- 0.07 mag. It exhibited long-term variability with a low amplitude of 0.3-0.4 mag in the I band. Our observations show that the star has brightened by ~2.5 mag since April 6.11 UT, 2019, it has currently (June 12.04 UT, 2019) I = 14.77 +/- 0.01 mag.
Such a slow rebrightening is inconsistent with a recurrent nova explosion (as nova eruptions reach the peak within hours-days). The long-term pre-rebrightening variability and the slow rise are reminiscent to the light curve of a red nova V1309 Sco. We did not find, however, any periodic variability in our archival light curve of V1047 Cen.
We encourage follow-up spectroscopic observations.
Archival OGLE light curve can be found here.
