04 mai 2014

T Tauri stars campaign, une campagne d'observation T Tauri pour l'automne 2013

  AAVSO Alert Notice 473T Tauri stars observing campaignNovember 6, 2012Darryl Sergison (University of Exeter) has requested AAVSOassistance with a campaign he is organizing on six T Tauri stars.He writes: "In Autumn 2013 I [and my PhD supervisor Tim Naylor ofExeter University are] undertaking a new study into the nature ofpre-main-sequence low mass stars, using time series opticalspectroscopy and UV-Visual-IR photometry...to build a clearerpicture of the environment around young solar-type stars andcharacterise their various... [Lire la suite]
Posté par gabalou à 20:25 - - Commentaires [0] - Permalien [#]
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22 septembre 2012

HD57682, final publication in MNRAS

This was a short term campaign, about three months during spring 2011, but a lot of discovers. links to the ARAS amateur survey (by Benjamin Mauclaire) Behavior of the h alpha line of this very rare Oe magnetic star needs a lot of physics to be explained. The final publication in the Monthly Notices of the Royal Astronomy Society is a long and heavy paper on the state of art of MHD applied to circumstellar environment. Well not really a light digest for sleeping time. Thank to J. H. Grunhut and all for allowing us to be... [Lire la suite]
Posté par gabalou à 10:35 - - Commentaires [0] - Permalien [#]
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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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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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