04 juillet 2012

Publication of results of the Epsilon aurigae spectroscopic campaign

For HVAR2012, publication by AAVSO of results of the spectroscopic campaign on epsilon aurigae are available. An analysis of the behaviour of the K 7699A and Na D lines by Robin Leadbeater  during eclipse can be found here http://arxiv.org/abs/1206.6754 An analysis of the behaviour of the h alpha line by Benjamin Mauclaire during eclipse can be found here http://arxiv.org/abs/1207.0795 A large collection of spectra has been gathered by Robin Leadbeater... [Lire la suite]
Posté par gabalou à 18:58 - - Commentaires [0] - Permalien [#]

03 juillet 2012

FF cam poster

These days at HVAR 2012 here is the poster who summarize spectroscopic observations of this new founded binary. Any comments are welcome ! Poster_FF_Cam_Hvar_2012
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30 juin 2012

RR Lyrae 20120624 Maxima

 Average seeing, and a strong wind did not allowed a good snr on this new time serie taken during a maxima rising phase Data at least. Note line doubling of NaD and strong h alpha and h beta emission during rising phase.   http://www.astrosurf.com/garrel/web_RRLyrae_Hb_20120624/RRlyrare_Hb_300serie.html          
Posté par gabalou à 13:45 - - Commentaires [0] - Permalien [#]
10 juin 2012

Last news of FF cam before poster publication at HVAR2012

Anatoly Miroshnichenko and Stephen Danford, from University of North Carolina in Greensboro have begun to analyze the large collection of data on FF cam, available in Bess database. "Dear colleagues,Let me congratulate you on a discovery of binarity of FFCam. Thierry'sinitial suggestion from a dynamic spectrum is confirmed bymeasurements of the radial velocity of the Ca I 6102.72 A line thatbelong to the cool component of the system. The orbital period is7.785 days. I have only measured one line. Its equivalent width isalmost... [Lire la suite]
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02 mai 2012

a visit to Greensboro University and Three College Observatory

During a holiday trip in US, i had the opportunity to visit my friend Anatoly Miroshnichenko and his colleague Steve Danford at the University of North Carolina in Greensboro (UNCG). Here is a small report of a two days and one night spent there. Greensboro is an average town at extreme west of North Carolina. The landscape is essentially composed of large forest and small hills with numerous lakes and rivers. Everything is tree and grass. Only downtown emerge from this green ocean. UNCG campus is a true american Campus.... [Lire la suite]
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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]
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23 mars 2012

FF cam, mid March report

FF cam is the weirdest thing i had never observed. Daily spectras are differents, intensities variation, shape, double or single peak, all configurations of the h alpha line for a Be star are possible. 4 differents observers are following this challenging star. Three echelle spectrographs (Eshell) and one long slit H alpha centered spectrograph (LhiresIII) with telescopes from 0.28m to 0.80m. 3 in Europe and 1 in US. Summary of the H alpha profiles: http://www.astrosurf.com/garrel/webFFcam_March19/Vspec_objet.html And some plots... [Lire la suite]
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07 mars 2012

Talk of Anatoly Miroshnichenko on delta sco 2010/2011

Miroshnichenko_DeltaSco_Iguassu_2012 Talk of Anatoly Miroshnichenko on delta sco 2010/2011 at Feb, 2012 ESO conference on hot stars in Brazil
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08 février 2012

request for photmetry support by TAROT and amateur observers

I've sent a request to Alain Klotz, TAROT and some observers in France for a photmetry support of FF cam. I need a B V measure in Jonhson-Cousin system. Message en Français pour un support photométrique sur FF cam Il s'avère d'aprés le suivis spectrométrique que cette étoile n'est pas une Be classique mais présente une variabilité spectrale hors du commun. Pas d'exemples connus à ce niveau de variabilité, profil et intensité. On échantillonne actuellement la période mais aprés un mois de mesures, avec un spectre échelle... [Lire la suite]
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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]
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