Page 1 of 2
Nova Cephei 2014
Posted: Tue Mar 11, 2014 6:41 am
by Christian Buil
Spectrum taken using the 0.28 m telescope and
Alpy600 spectrograph (10 A resolution at 6563 A)
from Castanet-Tolosan observatory the Mar. 11.130 UT
shows highly redened profile and strong P-Cyg shifted toward
blue by 610 km/s for Halpha and 585 km/s for O I 777.4 nm lines:
Christian
Re: Nova Cephei 2014
Posted: Tue Mar 11, 2014 12:31 pm
by Robin Leadbeater
Here is mine from a few hours earlier (rather low, skimming the trees)
Cheers
Robin
- _novacep2014_20140310_988_leadbeater.png (11.24 KiB) Viewed 14572 times
edit: updated graph with better subtraction of sky lines
Re: Nova Cephei 2014
Posted: Sun Mar 30, 2014 11:50 am
by Robin Leadbeater
Here is the evolution (in absolute flux using AAVSO V mag as reference)
It is getting hard to guide on the slit at mag 12.5 (3sec exposures on the DSI Pro) and there do not seem to be any alternative field stars
Cheers
Robin
Re: Nova Cephei 2014
Posted: Mon Apr 07, 2014 2:19 pm
by Olivier GARDE
Here's a spectrum of this nova taken last night at OHP observatory with C14 Lisa spectrograph and ATIK460EX
Olivier GARDE
Re: Nova Cephei 2014
Posted: Wed May 14, 2014 4:21 am
by Tim Lester
A new spectrum of nova Cep 2014 taken May 12.
Tim
Re: Nova Cephei 2014
Posted: Wed May 14, 2014 7:30 pm
by Francois Teyssier
Nice spectrum at mag 14. Not easy.
François
Re: Nova Cephei 2014
Posted: Thu May 15, 2014 5:09 pm
by Christian Buil
A medium resolution of nova Cephei taken the 15 May,
(R = 2200 - 4 x 600 seconds exposure - C11 + MedRES):
Large evolution compared to Tim's spectra ? To be confirmed...
Christian
Re: Nova Cephei 2014
Posted: Fri May 16, 2014 4:20 pm
by Christian Buil
New spectrum taken last night with the same instrument (MODRES - 8 x 600 sec on C11). Comparison with may May 15
spectrum:
The relative intensity of Halpha increase now slowly. More obsrervations needed
(and a fine photometric survey of the continuum is welcome also for interpret).
Christian
Re: Nova Cephei 2014
Posted: Wed May 21, 2014 3:43 am
by Tim Lester
Spectrum taken May 20th.
Comparison with my May 12 spectrum.
Tim
Re: Nova Cephei 2014
Posted: Thu May 22, 2014 2:18 am
by Tim Lester
Hello again,
I had very good seeing for my May 20th nova cep shot so I decided to convert the spectrum to flux.
My slit is 2.3 arcsec wide and seeing was about 1.8 arcsec so slit efficiency was pretty good and fairly constant.
I used HD195725 as the standard. It has a V magnitude of 4.22 in SIMBAD and is about 7 degrees from nova cep.
The airmass varied from 1.56 to 1.36 for the nova cep exposures and was 1.24 for HD195725. I did not correct for this.
After multiplying by the Bessel V curve and extracting the magnitude back out I get an mV of 14.82.
This agrees very well with the AAVSO light curve.
Tim