Thu, 02/06/2014 - 20:03
Rod Stubbings observed V745 Sco in outburst (mvis=9.0) on 2014 February 6.6 after observing it fainter than 13.0 24 hours prior. The nova has subsequently been confirmed by Paul Camilleri (CMQ) and Steve O'Connor (OCN), with more data coming in.
Jeno Sokoloski has requested as much photometry as possible, and is also requesting spectroscopic followup from the community as well. Several professional researchers are already working on getting X-ray and radio data for this nova, and optical data from the AAVSO community will be very useful for comparison to other wavelengths.
Sco is poorly placed in the morning sky right now, but this would be an interesting one to wake up early for!
Good observing, Elizabeth Waagen, AAVSO HQ
Here is a spectrum of V745 Sco 10x180s with the Star Analyser 100 in the convergent beam of a 254mm SCT with focal reducer f/6.3, captured with an Atik 383 L+.
I've identified the lines with best guesses based on the literature that I've found. Spectra from the first phase of the 1989 outburst are almost identical - these can be found in Williams et al. 1991. The nova clearly has a strong He emission profile. Some interesting nebular lines developed quite quickly in 1989 - it will be interesting to see if they reappear.
The Ha line is very broad - but includes HeII 6678 at this resolution.
Note that the "emission" feature at around 8350 is the zero-order image of a faint background star.
Cheers
Jonathan
AAVSO Alert Notice 496 on V745 Sco contained an erratum. Please see AAVSO Alert Notice 497 for details. Also, please note that the AAVSO website page for Alert Notice 496 has been corrected.
Good observing! Elizabeth Waagen, AAVSO HQ