Liverpool Telescope Spectrum of Nova Sco 2016 No. 2 (ASASSN-16kd)
ATel #9482; S. C. Williams (Lancaster), M. J. Darnley (LJMU)
on 10 Sep 2016; 10:48 UT
Credential Certification: Steven Williams (scw@astro.ljmu.ac.uk)
Subjects: Optical, Nova, Transient
We obtained an optical spectrum of Nova Sco 2016 No. 2 (ASASSN-16kd; see ATel #9469, #9477, #9478, #9479, #9480, CBET 4320) with the FRODOSpec spectrograph (Barnsley et al. 2012) on the 2.0m Liverpool Telescope (Steele et al. 2004) on 2016 September 9.84 UT. The spectrum was taken using the higher resolution mode, which gives a wavelength coverage of 3900 to 5100Å and 5900 to 8000Å, with a resolution of R ~ 5400.
The spectrum shows strong Balmer emission lines (Hα, Hβ, Hγ and Hδ), which are accompanied by P-Cygni absorption components. The absorption component comprises two main lines, one with a velocity of -900 km/s and one at -2000 km/s. The emission component of the Hα line has a FWZI of 6140 km/s and FWHM of ~1800 km/s. The spectrum displays strong emission lines from N I (3 triplet) and O I (7774Å) which also display the two-velocity absorption component seen in the Balmer lines. Several Fe II emission lines are detected, including those of the 27, 28, 42 and 74 multiplets. There is also an emission line at ~7120Å, which is likely C I, as seen in V339 Del for example (Shore et al. 2014). The Si II doublet at 6347/6371Å is present in absorption, and displays both velocity components.
The spectrum is typical of an Fe II nova around or shortly after peak optical brightness.
