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Bonjour a tous,

Que faire avec un 2400tr/mm au LHIRES III... J'ai suivi Ha toute la soirée mais pas beaucoup d'évolution. Doit on se concentrer sur d'autre longueurs d'onde Fe II He I ou Na I comme francois le préconise? Quelle stratégie adopter? D'autre LHIRES 2400 sont ils sur les rangs... dans ce cas il faudrait se coordonner.
Faut-il prendre un spectre de référence d'une étoile A0V pour mon cas? ou une simple réponse instrumentale utilisée pour BESS suffit?

Stéphane

Traduction google
Hello everyone,

What to do with the 2400tr/mm LHIRES III ... Ha I followed all evening but not much evolution. Should we focus on other wavelengths Fe II He I or Na I like francois advocated? What strategy? Other 2400 LHIRES they are in the running ... in this case should be coordinated.
Should we take a reference spectrum of a star A0V for my case? or a simple instrumental response used for BESS enough?

Stéphane

A Nova Del 2013 spectrum from last night.
Reference star HD 196544.

andré

Paolo and Giuseppe,

A very fine Lhires III spectrum, well resolved and well extended (blue part). Good idea to select the 600 grooves/mm and take mosaic. Also good initiative to exploit refocus of blue region.

The IR part can be a target, but a red order filter is mandatory (it is one my objective when I can re-observe spectra).
Remember this page: http://www.astrosurf.com/buil/infrared/obs.htm. Lhires III 600 g/mm configuration,
but note also fringe problem and solution.

André F, a very good LISA spectrum also tonight. Your experience acquired on Be stars survey is evident !

Generally all published spectra are very valuable and quality. The observation mark a date of amateur spectroscopy. It also shows the importance of good coordination, planification and the necessity of an organization.

Ciao

Here my spectra of the nova, taken last night with LHIRES III, grating 2400 L/mm and C14 SC.
Each spectrum in the plot = sum spectrum of three individual spectra.
Exposure time for an individual spectrum = 240 sec.

Ernst Pollmann
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Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete

Thank you for infos Christian! IR part of the spectrum is certainly very interesting but we need to add a filter (we dont know if it is an easy task).

Now we are observing the nova (with 600 l/mm grating) and we would report that in region between h-beta and h-gamma lines there are many new absorption lines not visible in the previous spectra. Can anybody confirm?

Paolo and Giuseppe

Paolo Berardi wrote:Thank you for infos Christian! IR part of the spectrum is certainly very interesting but we need to add a filter (we dont know if it is an easy task).

Now we are observing the nova (with 600 l/mm grating) and we would report that in region between h-beta and h-gamma lines there are many new absorption lines not visible in the previous spectra. Can anybody confirm?

Paolo and Giuseppe

Paolo,

It's difficult to confirm your observation with only an image of echelle spectro on the screen.

Paolo,


the spectrum changed drastically compared to last night. Absorption in P Cygni profiles is less pronounced in the blue region and as you mentionned there are lot of absorption lines... we are seeing this object changing over time "live" - incredible!

Here is my first serie of tonight: Compared to last night serie:
An animation of four night's spectra (clic to enlarge):
I have assembled 4 spectra (one for each night) in a colored 2D spectrogram which shows the evolution overall:
I hope lot of people are observing in higher resolution... and hopefully also continue to observe in the US and Australia for exemple... we need time coverage on this nova... )


Cordialement,
Olivier Thizy
Vous ne verrez plus des étoiles comme avant !
http://www.shelyak.com/en/

Thank you Olivier, your spectra shows very well the dramatic evolution, especially in blue region.
This is our spectrum taken this night (17.908 aug) with 1200 l/mm grating (wavelength calibration with Filly lamp):



We look forward at higher resolution spectra from Olivier G.

Ciao
Paolo e Giuseppe

My latest spectra from Aug 17, 2013 with 25cm telescope - LISA - Atik 460ccd. The spectrum has changed significantly over the past several days.

Jim

Observed the nova tonight using F-10 focal length of Meade 10 inch telescope. This dramatically sharpens the line detail shortward of 4000 angstroms. Only bad part is it takes 3x more exposure. My spectra from tonight also shows dramatic changes to the blue part of spectrum.