24 mars 2012

Call for CH cyg observation

A call for observations of the famous symbiotic star, one of the brightest, CH cyg has been launched by Margaritta Karovska. This is to support observations planned for the next two weeks in X ray (CHANDRA) and otical/UV (HST) domains. Observations are gathered on this page by the ARAS group http://www.astrosurf.com/aras/surveys/chcyg/index.html A run of three weeks of observations is ongoing with my eshell spectrograph and 0.35m LX200 telescope. I organized my observing session is divide in two parts. First part until... [Lire la suite]
Posté par gabalou à 16:07 - - Commentaires [1] - Permalien [#]
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23 février 2011

Z cma outburst

Hello, recently the pre main double star Z cma showed a stong photometric outburst according to the AAVSO special notice #232 http://www.aavso.org/aavso-special-notice-232 A new amateur international spectroscopic campaign has been designed to gather all amateur spectra observations concerning this outburst both in high and low resolution, visual and IR. http://www.astrosurf.com/aras/surveys/prestars/zcma/ Coordinates (2000.0) : R.A. = 07h03m43.2s, Decl. = -11°33'06" This star has a very spectacular spectra,... [Lire la suite]
Posté par gabalou à 11:37 - - Commentaires [0] - Permalien [#]
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31 octobre 2010

Strange facts about ci Cygni

Symbiotic star ci Cygni is going on eclipse these last weeks with a Mv dropping to 11.4. The period of the system is about 853 days and maximum is awaited for mid November At the same time the system has an ongoing outburst from the disk around the white dwarf whose began in July and certainly continue and repeated for months. The conjunction of an outburst and an eclipse is a unique chance for probing the inner regions of this strange object composed by a M dwarf type star and a White dwarf. The Aras group... [Lire la suite]
Posté par gabalou à 10:23 - - Commentaires [0] - Permalien [#]
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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 - - Commentaires [0] - Permalien [#]
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