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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]

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]

Another Be star, late type, B9 http://arasbeam.free.fr/spip.php?page=beam_spectra&etoile=1964 http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=hd+60062&submit=SIMBAD+search There is a lack of spectra concerning this star with a suspicion of fast variation in Ha line. My three last observations showed three differents Ha spectra in 8 days. Two of them are of good snr only one is suspicious. What may cause this variation ? What is the period ? There is a needing for more spectrum coverage. Etoile de magV 7.9 montrant une... [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

Comparaison entre les poses unitaires brutes, les spectre 1D et neon. Comparaison between raw spectrum , 1D spectra and neon, LhiresIII, Atik314L+, Binning 2X2, slit 35µm, R=15000 960s exposure Raw spectra, and 1D spectra (Name, AD, Dec, Mv, Spectral tyoe, VsinI)   1 HD 127617 14 31 59.56 18 46 00.74 8.73 B5e 120 NEW MAGNITUDE RECORD 1 z Her 17 50 03.33 48 23 38.95 6.76 Bpshe 159 1 tet CrB 15 32 55.78 31 21 32.88 4.153 B6Vnne 340 1 53 Boo 15 31... [Lire la suite]

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]

Cette étoile Oe magnétique, O?fpe a un comportement étrange, un appel à contribution est lancé. On ne connait qu'une poignée d'étoiles O de ce type et celle ci est entouré d'un disque qu'elle contraint par son fort champs magnétique. On observe de fréquentes éruptions en Ha dont on essaye de connaître la régularité. Enfin si il y en a une... Very strange behavior of this O?fpe star. frequent outburst occured at regular interval. It is necessary to constrain a period, more observations are needed. Aras link, lien vers la page d'aras... [Lire la suite]

Last spectra of Be stars after two weeks of bad weather. Some different aspect of the Ha line profile depending of the Be activity and sight of view, pole on or equator. Gam Cas,mV 2.39 B0IVpe HD57682, mV 6.4 O9Ve, HD70340, mV 6.4 A2Vnnpe HD112028, mV 5.3 A1IIIshe HD142926, mv 5.74 B9pe Most of the spectrum are made in binnig2X2. Only the bright gam cas was made in binning 1X1 mode. The dispersion is twice in Bin2 than in Bin1 for the same resolution, around 15000 here. Slit is 35µm large and ccd pixel are 6,4µm. SNR for... [Lire la suite]

Confirmation du changement de profil spectral de l'étoile Be Tetha de la couronne boréale détecté par Benjamin Mauclaire survenu entre le 22 aout 2009 et le 7 mars 2010 qui pourrait bien être en outburst. Spectres Bess concernant Tet Crb: http://arasbeam.free.fr/spip.php?page=beam_spectra&etoile=789 "Out burst of tetha CrB detected by Benjamin Mauclaire and confirmed by me yesterday nignt. Outburst occured between 2009-08-22 and 2010-03-7 "

Be star, A2Ve spectral type, HD58713 is from magnitude 8.68. New record of low brightness for my setup, Tak CN212 scope, LhiresIII 2400gr/mm and an Atik314L+ ccd camera. The sky was hazy, and not enough exposure time to get a good snr, about 10 here. Hope to achieve better snr, aroud 50 with exellent transparency and much more exposure. My goal was only to make the first specta of this star in Bess database, proud to be first. Following observations will be able to detect outburst of this star, in a quiet phase now.   Un... [Lire la suite]