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Optical spectroscopy and photometry of SN2014J in M82

ATel #5829; T. Bonev (Institute of Astronomy and NAO, Sofia, Bulgaria), T. Tomov, E. Swierczynski (Nicolaus Copernicus University, Torun, Poland), I. Iliev, D. Dimitrov, H. Markov, K. Stoyanov, M. Belcheva, G. Nikolov, P. Nikolov, D. Chanliev, M. Churalski, Y. Nikolov, A. Kurtenkov, I. Stateva, N. Petrov (Institute of Astronomy and NAO, Sofia, Bulgaria), W. Dimitrov (Adam Mickiewicz University, Poznan, Poland), F. Musaev (Special Astrophysical Observatory, RAN), Z. Tsvetanov (Johns Hopkins University, Baltimore, USA), I. Miloushev, T. Tenev (Institute of Solid State Physics, Sofia, Bulgaria)
on 29 Jan 2014; 12:46 UT
Credential Certification: Toma Tomov (tomtom@astri.uni.torun.pl)

Subjects: Optical, Supernovae

Referred to by ATel #: 5840, 5843, 5876

During the commissioning of the new echelle spectrograph attached to the 2m RCC telescope of NAO Rozhen (Bulgaria) we obtained a high-resolution spectrum of SN2014J on January 23.75UT. The spectrum covers the range 3900-9200A with a resolving power ~30000. The most prominent feature in our spectrum is the SiII 6355A absorption with an EW ~120A and FWHM ~220A. Other well visible absorptions are SiII 5972A, SII 5468A and the blend SII 5612, 5654A with EW 20A, 27A, 24A and FWHM 126A, 105A and 96A respectively. The CaII IR triplet appears as a very wide absorption blend centered at about 7900A with EW ~100A. The SiII 6355A absorption gives a radial velocity of about 14100km/s. While the velocity measured using the lines SiII 5972A and SII 5468A is ~12300km/s. A similar velocity difference was reported in ATel #5818. The inter-stellar NaI D absorptions present in our spectrum a sharp component shifted by about -2km/s. All the other galactic, inter-galactic and host galactic components (see Cox et al., ATel #5797) are blended in wide absorption structures between 40km/s and 220km/s with EW 2.4A for D1 line and 2.6A for D2 line. Using a SBIG-STL-1001 CCD camera attached to the 60cm Cassegrain telescope at the Nicolaus Copernicus University Observatory (Torun, Poland) we estimated the BVR brightness of SN2014J to be B=12.20+/-0.02, V=10.93+/-0.02 and R=10.37+/-0.02 on January 25.73UT. GSC 4383-1106 (B=12.832+/-0.097, V=12.215+/-0.051, R_c=11.97+/-0.129) was used as a comparison star. Its B and V magnitudes were taken from The AAVSO Photometric All-Sky Survey (http://www.aavso.org/apass). The R_c magnitude was obtained using Fukugita et al. (1996, AJ, 111, 1748) formula and Sloan r'=12.138+/-0.028 from The AAVSO Photometric All-Sky Survey.