02 février 2012

FF cam, January behavior of the H alpha line

I've started a spectral monitoring of one my favorite star, FF cam. I discovered this star in 2009 by a routine survey of Be stars. Considering the Bess program, this star was observed only once par year before. I was surprised in 2009 in two consecutives nights, while redoing spectra due to bad SNR, to see how much the h alpha profile has changed. I did some others spectra in 2009 showing a great activities in H alpha and let it down for a while. At this time i was using a LhiresIII... [Lire la suite]
Posté par gabalou à 12:02 - - Permalien [#]
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11 juillet 2011

IAC80, a mission on delta scorpii at the Teide

For nine nights i have been there in good compagny. http://www.iac.es/eno.php?op1=3&lang=en This mission was about the peri-astron of delta scopii and was a real success. We have got in nine nights 30 Halpha spectra, 30 HeII 4500, 4686 and one H gamma. All taken with a LhiresIII 2400gr/mm and ST10XME camera. Exhausting sometimes...  Two articles in english are ingoing. One for Sky and telescope, relating this fantastic adventure, and one on a referee journal concerning the scientific facts. One other in a french... [Lire la suite]
Posté par gabalou à 18:38 - Permalien [#]
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16 janvier 2011

OT gem outburst !

OT gem, HD58050, Be star, has ran in activities. Double Ha peak get stronger in my last spectra.There is not a lot of spectra available in Bess, but such activities were seen from 1996 to 2001 by Valerie Desnoux and Christian Buil. Intensives observations are needing to constrain a possible period of the phenomena. http://arasbeam.free.fr/spip.php?page=beam_spectra&etoile=327 http://astrosurf.com/buil/becat/58050/58050.htm   _hd58050_20110114_979   It's always a great pleasure to observe such regain of a... [Lire la suite]
Posté par gabalou à 19:03 - - Permalien [#]
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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]
Posté par gabalou à 21:19 - - Permalien [#]
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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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28 mars 2010

Qu'arrive t'il à HD57682 ?

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]
Posté par gabalou à 19:28 - - Permalien [#]
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28 mars 2010

Last Be spectrum

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]
Posté par gabalou à 19:21 - - Permalien [#]
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17 mars 2010

Outburst de Tet CrB

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 "
Posté par gabalou à 09:28 - - Permalien [#]
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13 mars 2010

HD58713, new magnitude record !

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]
Posté par gabalou à 12:34 - - Permalien [#]
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10 mars 2010

Des étoiles Be de type A et axe de visé, Be stars from A spectral type and line of sight

Ciel dégagé, nouvelle monture, et trois cibles, trois étoiles Be de type spectral A. HD 79066, Phecda, Phi Leo. "Clear sky, new mount, and three Be stars from A spectral type"   Etoile Be : HD 79066 Simbad database, CDS Numéro HD : 79066 Magnitude V : 6.35 Simbad database, CDS Type spectral : A9IVe Simbad database, CDS vsini : 29 km/s Royer, Grenier, Baylac et al., 2002, A&A 393, 897 Distance : 51 [49-53] pc Perryman, Lindegren, Kovalevsky et al., 1997, A&A 323, 49 Vitesse radiale : 3.4 ±2 km/s Wilson, 1953,... [Lire la suite]
Posté par gabalou à 09:31 - - Permalien [#]
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