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Optical photometry and spectroscopy of Nova Del 2013

ATel #5288; T. Tomov, K. Ilkiewicz, E. Swierczynski (Uniwersytet Mikolaja Kopernika, Torun, Poland), M. Belcheva, D. Dimitrov (Institute of Astronomy and NAO, Sofia, Bulgaria)
on 15 Aug 2013; 22:34 UT
Credential Certification: Toma Tomov (tomtom@astri.uni.torun.pl)

Subjects: Optical, Nova

Referred to by ATel #: 5297, 5300

We report optical BV photometry and spectroscopy of Nova Del 2013, carried out between August 14.88 UT and August 15.08 UT. Using a 60 cm Cassegrain telescope at the Nicolaus Copernicus University Observatory (Torun, Poland) we estimated the V brightness of the Nova to be 6.31+/-0.02 mag and 6.18+/-0.03 mag on Aug. 14.94 UT and Aug. 15.02 UT respectively. HD 194113 (F2, V=8.00 mag) was used as a comparison star. The (B-V) color of the nova was 0.19 and 0.21 mag respectively, showing a reddening of ~0.02 mag in about two hours. Spectral observations were performed in the 4400-7000 AA range using the echelle spectrograph (R~11000) attached to the 60/90 cm Schmidt-Cassegrain telescope (Torun, Poland) and in regions covering ~200 A around Halpha, Hbeta and NaI (R~16000) using the Coude spectrograph of the 2 m RCC telescope at the Rozhen Observatory (Rozhen, Bulgaria). As Darnley et al. (ATEL #5279) and Shore et al. (ATEL #5282) reported the strongest in the spectrum are the Balmer lines demonstrating P Cyg profiles. The Halpha emission shows a flat top. The radial velocity measured at the minima of the P Cyg absorptions is about -1600 km/sec. At the blue edges of these absorptions we measured a velocity of about -2100 km/s. Weaker lines of Fe II, He I, Si II, Mg II, etc., are seen in the spectrum and some of them show apparent P Cyg profiles as well. The mean radial velocity measured for the absorption components of these metallic lines is about -850 km/s. Using the equivalent width of the interstellar NaI D1 line and the relation of Munari & Zwitter (1997) we estimated an E(B-V)~0.17 mag.