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)
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.
