Near-infrared observations of the recent brightening of V1047 Cen (Nova Cen 2005)
ATel #12923; T. R. Geballe (Gemini Observatory), D. P. K. Banerjee (PRL, India), A. Evans (Keele University, UK), R. D. Gehrz, C. E. Woodward (Minnesota), U. Munari (INAF Astronomical Observatory, Padova), P. Woudt (UCT), E. Aydi (MSU), D. A. H. Buckley (SAAO), P. Mroz (Warsaw University Observatory), F. Walter (Stonybrook), S. Starrfield (ASU), F.-J. Hambsch (VVS, BAV, AAVSO), K. Sokolovsky (MSU), M. Orio (National Institute of Astrophysics Padova and University of Wisconsin at Madison), K. Page (Univ. Leicester, UK), R. M. Wagner (Ohio State University and LBT Observatory)
on 11 Jul 2019; 16:27 UT
Credential Certification: Dipankar P.K. Banerjee (dpkb12345@gmail.com)
Subjects: Nova, Transient
Referred to by ATel #: 12975
Following the report of its recent brightening (ATel #12876) and subsequent follow-up observations
(ATel #12885, #12889, #12893), we observed V1047 Cen (Nova Cen 2005) with FLAMINGOS-2 on the 8m
Gemini South Telescope on 2019 July 1. The spectrum covers the wavelength range 0.95 - 2.5 microns
at variable resolution in the 0.96-1.76 micron band (with a peak value of R ~ 1000), and a higher
resolution of R = 1000 - 3000 in the 1.84-2.5 micron band. The spectrum is dominated by a reddened
blue continuum, on which are superimposed Paschen, Brackett and Pfund recombination lines of HI with
FWZI ~4000 km/s. The Brackett gamma line (2.1656 microns), which is recorded at the higher
resolution of 3000, shows a complex structure. Several HeI and HeII lines are seen, with HeI 1.083
micron being overwhelmingly the strongest line with a similar FWZI to the HI lines. Because of its
being observed at higher resolution, the HeI 2.058 micron line displays complex absorption, with two
prominent P Cygni-type minima separated from the weak emission peak by -553 and -1661 km/s
respectively. We also tentatively identify the coronal line [Ca VII] 2.3211 microns which is seen
to be double-peaked, with a peak to peak separation of ~ 1100 km/s.
The observations were taken
during the Director's Discretionary Time under program GS-2019A-DD-111.
