Spectroscopic observations of AT2016hvu and PNV J00424181+4113433 with the Nordic Optical Telescope

ATel #9744; A. Somero, T. Kangas, J. Harmanen (Turku), A. Ederoclite (CEFCA), S. Barcewicz, T. Heikkila, S. Hon, T. Kumar, S. Mattila (Turku), E. Gafton (NOT)
on 11 Nov 2016; 21:53 UT
Credential Certification: Seppo Mattila (seppo.mattila@utu.fi)

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We report spectroscopic observations of the transient AT2016hvu in NGC7316 discovered by the Catalina Real-time Transient Survey (CRTS; Drake et al. 2009, ApJ, 696, 870 ; http://crts.caltech.edu/ ) and the nova candidate PNV J00424181+4113433 reported in ATel #9716.

The observations were performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 350-950 nm; resolution 1.6 nm).

 
Name                   | Discovery (UT)  | Discovery mag | Observation (UT) | Redshift | Notes 
AT2016hvu              | 2016-11-06.11   | 17.6          | 2016-11-09.89    | 0.0185   | (1)  
PNV J00424181+4113433  | 2016-11-04.44   | 17.1          | 2016-11-09.90    | 0.0      | (2)  

(1) The spectrum shows a blue almost featureless continuum and narrow emission lines from the host galaxy.
(2) The spectrum is a puzzling combination of features from both He/N and Fe II nova types. The FWHM of H alpha is ~3000 km/s indicating a He/N type, but the line shape is Fe II -like.