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Re: Nova Cep 2013
Posted: Sat Feb 09, 2013 9:28 pm
by Francois Teyssier
Hi Robin,
Nice spectrum
74 is the number of a Fe II multiplet (Grotrian diagram) with lengthwaves = 6148, 6247 and 6417 angströms
Another noticeable multiplet in Fe Nova spectra is (42) : 4924, 5018, 5169 angströms
See :
http://www.astronomie-amateur.fr/Projet ... Novae.html
(bottom of the page) with a list of common lines in novae spectra
Bonne continuation
François
Re: Nova Cep 2013
Posted: Mon Feb 11, 2013 12:03 am
by Paolo Berardi
Your and my last observation clearly show a strong increase of h-alpha line intensity. I set my spectra with the profile scaling range 6650-6750 A (before I used 6600-6620, not a good range because of some h-alpha signal inside).
In my last spectrum (some hours ago) the h-alpha line has evolved showing a pronunced p-cygni absorption blueshifted (6545.4 A w/helio) at about 800 Km/s.
Spectrum of 10.747 feb 2013:
Fit profile:
http://quasar.teoth.it/html/spectra/_no ... 10_747.fit
Comparison between 4, 6 and 10 february in h-alpha region:
Robin, the SA100 spectrum looks very nice, sharp with plenty of spectral features (despite the optical collimation problems). Should 2nd order contamination be a minor problem because of reddened star? The first relatively strong signal is h-beta emission that impacts at about 9600 A. I see several emissions at 7800 and 8500 A (may be there are other emissions I do not see in the background of jpg image).
François, if you wish, take the profile in fit format for the ARAS page.
Ciao
Paolo
Re: Nova Cep 2013
Posted: Mon Feb 11, 2013 6:55 pm
by Francois Teyssier
Oh yes I wish, Paolo !
This is excellent. You have clearly the evolution of the different absorption systems (pre-maximum and principal, i think)
I updated the log with your spectrum and also main page with the evolution of H alpha line.
http://www.astrosurf.com/aras/novae/Nova2013Cep.html
Also two spectra sent by Jim from Florida.
Amitiés
François
Re: Nova Cep 2013
Posted: Wed Feb 13, 2013 4:26 pm
by Robin Leadbeater
Paolo Berardi wrote:
Robin, the SA100 spectrum looks very nice, sharp with plenty of spectral features (despite the optical collimation problems). Should 2nd order contamination be a minor problem because of reddened star? The first relatively strong signal is h-beta emission that impacts at about 9600 A. I see several emissions at 7800 and 8500 A (may be there are other emissions I do not see in the background of jpg image).
Thanks Paolo,
Here is the reduced, instrument response corrected version. (Also in fits format for François)
- _nova_cep_2013_crop_20130206_937_leadbeater.png (10.07 KiB) Viewed 14740 times
I limited the wavelength range slightly to avoid problems with an overlapping spectrum from another star at the blue end at the red end where the second order might potentially start to become a problem as the flux increases.
For interest, I measured the EW of the H alpha line and compared it with your spectrum from the same night. I got -230 A compared with -205 A for your spectrum. A good agreement I think considering the very large difference in resolution
Cheers
Robin
Re: Nova Cep 2013
Posted: Wed Feb 13, 2013 5:14 pm
by Lars Zielke
Hi
I think this is my first post here, although I've been a member for some time.
A spectrum from feb. 10th. reduced, instrument response corrected. To get better a wavelength calibration in the IR domain, I used the OI 7773Å line.
So now I need to identify the other emission lines in the IR domain.
- nova-20130210-60s-spec-aras.jpg (69.15 KiB) Viewed 14718 times
Re: Nova Cep 2013
Posted: Fri Feb 15, 2013 4:43 pm
by ivan degennaroaquino
Really nice spectra!
The magnitude is raising pretty fast sadly. Greetings to everybody!
Ivan
Re: Nova Cep 2013
Posted: Fri Feb 15, 2013 7:49 pm
by Lars Zielke
Hello
The emission line at around 7122 Å ? Where is that emission coming from?
Cheers
Lars
Re: Nova Cep 2013
Posted: Sat Feb 16, 2013 4:48 am
by Francois Teyssier
Spectre du 14-02
Pas facile, le continuum s'effondre. Seule Ha reste évidente.
Mag 13.3 dans le vert et 11 dans le rouge (raie Ha)
François
Re: Nova Cep 2013
Posted: Sat Feb 16, 2013 9:28 am
by ivan degennaroaquino
At 7135A usually an Argon line [Ar III] is strong in late spectra. It could be, given the fast decline of the nova. Nice result from last spectrum Francois, no more Fe emission.
Re: Nova Cep 2013
Posted: Sat Feb 16, 2013 12:01 pm
by Francois Teyssier
Hello Ivan and Lars,
1. In spectra obtained with Lisa at R=1000, the wave lenght of the unidentified line is 7116 (far from [Ar III] 7135
2. In these *
early* spectra, we have not other nebular, forbidden lines
So I doubt that the line could be [Ar III]
In the geat list of line published in Williams 2012, there's no line between HeI 7065 and [Ar III] 7135
Waiting for your comments, Ivan,
Cheers
François
Williams 2012 :
http://arxiv.org/ftp/arxiv/papers/1208/1208.0380.pdf
PS : do you envisage to come to OHP spectro party this year?