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Salut à tous et toutes Une petite CI Cygni en cours. Toujours en état bas. Aura t-on la chance d'avoir un 3ème outburst comme dans les années 70? J"ai, à grand regret laissé tomber la SN, cachée par le lilas. La nuit est superbe à Rouen, petit flux de vent froid tombant directement du grand nor...

Salut Thierry,
J'ai refais un time-serie sur P Cyg interrompu par l'arrivée de la brume. Classique pour la saison.
9 spectres sur 45 minutes seulement.
a+
François

Hi, I tried a time serie yestersday on P Cygni. It consists in 24 spectra (each spectra is the sum of 9 images) acquired during 2 hours (19:55 to 21:55 UT) every 5 minutes. EW Halpha is measured between 651.5 and 661.5 nm. The continuum is estimated in the ranges [649.5 nm ; 651.5 nm] and [661.5 nm ...

Clear sky tonight after a week of bad weather.
SN acquisition in progress.

I tried to summarize what I understood about the spectrum formation and evolution in type Ia supernovae. Also are presented first results of velocity measurements of the ARAS campaign spectra. http://www.astronomie-amateur.fr/feuilles/Spectroscopie/SuperNovae_Ia.html SN 2011fe is now about 1 month a...

First published results about the outburst : Electronic Telegram No. 2861 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alt...

Recent publications of interest for amateur spectroscopy N° 2011-2 2011 September Be Stars Optical spectroscopy of Classical Be stars in open clusters http://arxiv.org/abs/1108.5850 The Temperature Structure of Be Star Disks in the Small Magellanic Cloud http://arxiv.org/abs/1110.0547 Hot Stars The ...

Hi Ernst,
Thank you for the explanations.
The range you mention (6515 to 6610 Angströms) is almost the same I used (6518-6512).
I see that the assymetry in the broad component is in fact the contribution of CII.
Best regards
François Teyssier

A low resolution spectrum, one day before the nice people's spectra. http://www.astronomie-amateur.fr/ResultatsSpectro/PCyg/PCyg_20110930_841.PNG I measured EW = -94.5 Integration between 6518 and 6612 angströms Also a gaussian fitting with two components : http://www.astronomie-amateur.fr/Resultats...

Bonsoir Matthieu, C'est pas mal. 1. Effectivement, ca vaut la peine de passer un peu de temps (quelques minutes) à bien régler la caméra pour avoir la trace la plus horizontale possible. Christain a une combine : bagues appareil photo : la CDD retrouve excatement la bonne position. 2. Tu as un probl...