11 octobre 2010

Somes September and early October news of epsilon Aurigae

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]
Posté par gabalou à 10:43 - - Commentaires [0] - Permalien [#]

25 juillet 2010

HD 206773, raies nébulaires

HD 206773 se trouve dans une nébuleuse, IC1396 dans Céphée. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+206773&submit=SIMBAD+search         Du coup son spectre se trouve affublé d'une fine raie en émission Ha flanquée de plus subtiles raies de l'azote en émission elles aussi. Ces raies ne sont pas dues à l'étoile mais au gaz chaud et dilué l'environnant.                          Elles occupent toute la largeur... [Lire la suite]
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19 juin 2010

HD171219, COROT observation

These days Bess observers were asked for Ha spectra coverage of HD171219 in Ophiucus by COROT  team. COROT is a very accurate photometric space telescope. Its primary goal is asteroseismology, star variability and secondary is eclisping exolplanet (16 to date discover) http://corot.oamp.fr/. For a couple of weeks, COROT will measure the tiny star luminosity variation. HD171219 is Be star, view by the equator, shell star, of mV 7.65 ... [Lire la suite]
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16 juin 2010

Last news of FF cam

This new highly variable Be star seems to be very strange. Each six differents spectrums taken between April 25th and June 6th are different ! So fast and intense variation from a Be star are not common. Sheliak is an example, perhaps unique with FF cam.  "6 spectres differents du 25 avril au 6 juin ! Les variations sont rapides et intenses, en profil et en largeur équivalente. Rien de commun avec la majorité des Be. Elle partage cette activité avec Sheliak, un système complexe aux variations similaires."  A period, if... [Lire la suite]
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15 juin 2010

Neon stuff

The LhiresIII spectrograph has a built-in neon lamp for calibrating stellar spectrum. Taking one neon spectra before and after stellar exposition is highly recommended in high resolution spectrography cause of the mechanical instability of this "at telescope focus" slit spectrograph. Here is an illustration of the mechanical effect on the shift of the band pass of the neon spectrum.   " Dérive de la bande passante du LhiresIII sur un spectre du néon avec en haut une rotation de 180° en Dec, en bas une rotation de 90° en Ra... [Lire la suite]
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06 juin 2010

Observing during daylight, observation de jour

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]
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21 mai 2010

Dernier spectre de Epsilon Aurigae ?

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]
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05 mai 2010

HD60062, FF cam

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]
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26 avril 2010

Animation epsilon aurigae

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
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25 avril 2010

960s raw spectrum and 1D spectra

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]
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