nova Cep

[Robin Leadbeater]

I was observing sn2014J tonight when the report of nova Cep came in. I am on it with the ALPY now low in the North (A rare advantage of being at 55 N)
The raw spectrum is showing a nice P cygni profile H alpha

Robin

[Francois Teyssier]

Excellent !
Hâte de voir le spectre traité
Cheers
François

[Robin Leadbeater]

Poor conditions tonight with a bright moon and mist. There have been big changes in the spectrum in the last 3 days with the Balmer lines growing dramatically. The fog has now rolled in though so it is time for bed.

Robin

[Hubert Boussier]

Hello Robin,
I have Just a question from a beginner in spectroscopy. I do not understand what kind of picture you attached to you e mail on the upper left: nova_Cep.pic.
I see the spectrum of the observed star which seems to be pasted on a star field generated by a sky map software. It looks like a picture done with a star analyzer, but with only the spectrum of the nova.

Thanks by advance for helping me to understand.

All the best

[Robin Leadbeater]

Hello Hubert,

It is a screen shot from Visual Spec showing the raw spectrum image from the ALPY 600 without any dark subtraction. (The pic file was generated by IRIS where I subtracted the background) The "stars" are just hot pixels. I admit, some of them look rather strange. I think the screen grabbing software must have produced some artifacts.

Cheers
Robin

[Hubert Boussier]

OK I see, I have been mislead by the shape of the hot pixels, some of them looks like Airy star diffraction patterns.
Thanks