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CCD Spectroscopy of the optical transient PNV J03093063+2638031

ATel #6653; Santangelo, M. M.M, Gambogi, S. (Astron. Obs. Capannori)
on 1 Nov 2014; 07:35 UT
Credential Certification: Filippo Mannucci (filippo@arcetri.astro.it)

Subjects: Optical, Nova, Transient

M.M.M. Santangelo and S. Gambogi obtained long-slit CCD spectroscopy of the recently discovered optical transient PNV J03093063+2638031 The observations were performed on October 30.8 UT 2014 by means of a SBIG SGS spectrometer + CCD camera ST-7 XME attached at the 0.60 m f/9.83 Cassegrain reflector of OAC Astronomical Observatory of Capannori, Italy. An exposure time of 1800 seconds was made at the dispersion of 4.3 Angstrom/pixel through a 18 arcseconds wide slit; the wavelength range is from 3017 to 6315 Angstrom. The preprocessing of this frame was performed by subtracting bias + dark + night-sky frame. An 1x2 vertical binning was used. The spectrum was wavelength calibrated by means of Mercury and Hydrogen lamps taken immediately after the 1800 seconds exposure. In our spectrum of PNV J03093063+2638031 wide absorption lines of H-beta, H-gamma, and a possible hint of H-delta and He I 4921 can be identified. The spectrum resembles that of a dwarf nova in outburst, but within this wavelength range there is no trace of the emission-line cores that often can be detected in the spectrum of dwarf novae. So the dwarf nova having the most similar spectrum to PNV J03093063+2638031 seems to be TY PSC. Moreover PNV J03093063+2638031 has a Na I D1 D2 doublet in absorption, of probable interstellar origin. This could indicate a fairly high distance or otherwise a fairly high interstellar extinction. But the slightly bluish look of the continuum of this spectrum points in favour of a not so high interstellar extinction.