Liverpool Telescope Spectrum of Classical Nova ASASSN-16ig
ATel #9375; S. C. Williams (Lancaster), M. J. Darnley (LJMU)
on 15 Aug 2016; 11:46 UT
Credential Certification: Steven Williams (scw@astro.ljmu.ac.uk)
We obtained an optical spectrum of classical nova ASASSN-16ig in Sagittarius (see ATels #9343, #9352, #9359, CBET 4295, 4299) with the FRODOSpec spectrograph (Barnsley et al. 2012) on the 2.0m Liverpool Telescope (Steele et al. 2004) on 2016 August 11.88 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 Balmer emission (Hα, Hβ, Hγ and Hδ) with strong P-Cygni absorption components. Hα and Hβ clearly display a `double' absorption structure with one minimum at approximately -800 km/s and one at around -1500 km/s. Measuring the absorption component of Hα indicates a maximum velocity of 2300 km/s. This two-component absorption profile is also seen on the O I 7774 Å emission line. We detect the Fe II (42) and (74) multiplets, again with strong absorption components and minima at -800 km/s. Some of the Fe II lines also show evidence of the higher velocity absorption component seen in Hα, Hβ and O I. The spectrum shows absorption from the N I (3) triplet with the minima blueshifted by approximately 700 km/s. We also detect absorption from the Si II (2) doublet (minima at around -800 km/s). Our results are in good agreement with CBET 4299.
