Epsilon Aurigae

For HVAR2012, publication by AAVSO of results of the spectroscopic campaign on epsilon aurigae are available. An analysis of the behaviour of the K 7699A and Na D lines by Robin Leadbeater  during eclipse can be found here http://arxiv.org/abs/1206.6754 An analysis of the behaviour of the h alpha line by Benjamin Mauclaire during eclipse can be found here http://arxiv.org/abs/1207.0795 A large collection of spectra has been gathered by Robin Leadbeater... [Lire la suite]

  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]

En ce mois de novembre, les spectres de epsilon aurigae montrent un brusque retour de la signature en émission de l'anneau d'hydrogène ceinturant la supergéante F. Le disque obscur éclipsant ne couvre plus la partie R, s'éloignant de nous, de cet anneau. Comme l'anneau est pratiquement en contact avec l'étoile, le troisième contact de l'éclipse est proche. La photométrie permettra de le préciser par une brutale remontée de la luminosité. Le quatrième contact et fin de l'éclipse débutera avec le retour de l'aile B, s'approchant de... [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:  

Hi everybody, it was a long time i did not any blog on my observations. I was very busy with weirds spectral things during August on eps  aur and compete a spectral run on Be star with more than forty stars observations. Some publications are awaited on theses events. Now autumn weather is back, rayny and windy for weeks so i have time to talk about the latest observations. Here are the last news of eps , 2010 September, early October. I will talk further about strange things arriving during august at OHP spectroscopy... [Lire la suite]

Spectroscopy of eps aur in these times is a tought task. I've been able to follow esp aur during end of may and this early June with a higher pier. I've started capture during daylight, with manual autoguiding, having still 40mm before epsaur set behing neirborough houses. My observatory is on the eastern slope of an urban hill and the only possibility for me to do spectra of epsaur is to begin capture during daylight. The difficulty is to spot it. I used a goto mount but it's not a perfect method as i used the moon or the sun... [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]