epsilon aurigae

  In 2010, November the red wing of the HII shell around the supergiant F star has reappeared, uncovered by the secondary object. This return make the inside bottom Ha bump disappeared and some unexpected bumps appeared in the sodium doublet in December, January and February. The photometric data shows a decrease of the luminosity in January and February 2011, as the red wing get stronger and stronger. Now Eps Aur is at the lesser magnitude ever observed during this eclipse. That was unexpected.   Have look... [Lire la suite]

In 2011 January a Poster made by Robin Leadbeater, was presented at the January 2011 AAS in Seatle. This poster based on the epsilon Aurigae internationnal campaign spectra summarized in a wonderful manner the two thirds parts of the ongoing eclipse. Thanks Robin for your impressive and talent full works ! Text version : http://www.threehillsobservatory.co.uk/astro/ASS217_poster_257_04.pdf Poster version : http://www.threehillsobservatory.co.uk/astro/AAS217_poster_257_04_original.pdf   Thanks Robin for... [Lire la suite]

  A summarize of my 2010, October observations around Ha region. Eps aur seems to have a very quiet phase, the first one after mid eclipse. No majors changes in the Ha core. Some transients lines appeared and disappeared around 6605A region. Add from November, 2nd:  

Eps Aur approche de sa conjonction solaire. Elle est chez moi très basse à l'horizon encombré d'une colline. Je suis obligé de lancer les acquisitions quasiment en plein jour, enfin dés qu'elle est visible à l'autoguidage. Voici donc peut être le dernier spectre avant sa conjonction et le retour du coté du petit matin.   "perhaps the last spectra of eps aur before sun conjunction. Low on the northwest horizon during sunset, i have to begin capture during daylight as soon as it's visible in the autoguider cam" 20mm... [Lire la suite]

Cliquer sur l'image, click on the picture Ha secondary peak inside the Ha absorption of the primary star Overall Ha Ew graph. Note the linearity of the progression as the red Ha horn disapeared For more information on epsilon aurigae system : http://www.hposoft.com/Campaign09.html

Un clip musical présentant les variations spectaculaires que connait le spectre Halpha de ce système. http://www.youtube.com/watch?v=cvbnSTuUbus download (344ko) epsaurblues L'aile rouge et bleu dansent, agitées par des phénomènes non liés à l'éclipse en cour, puis soudainement vers la fin, l'aile rouge disparait et l'aile bleu s'atténue montrant que l'on atteint la centralité. A suivre donc. Un autre clip, plus ancien :http://www.youtube.com/watch?v=U318qcPU7WM L'évolution de la largeur équivalente jusqu'à maintenant. On... [Lire la suite]