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BeSS data analysis : Workshop in Meudon (News)

Sunday 20 February 2011 by Francois Cochard
On Friday february 20th, 2011, we had a meeting in Meudon, between Amateurs (V. Desnoux, M. Bonnement, P. Chambraud, O. Thizy, F. Cochard) and Professionals (C. Neiner, M. Floquet, E. Alecian, B. De Batz, B. Leroy). The goal was to discuss the best way to analyse available BeSS data. We (...)


H-alpha V/R time behavior in pi Aqr (News)

Sunday 13 February 2011 by Ernst Pollmann
Halpha V/R time behaviour in pi Aqr The V/R measurements in Hα spectra of the binary star π Aqr since October 2004 until today, makes possible an analysis of a possible periodic behavior. Fig. 1 shows the V/R time behaviour in seven visibility phases, fig. 2 shows in power spectrum a dominant (...)


Monitoring the radial velocity of ζ Tauri (News)

Sunday 13 February 2011 by Ernst Pollmann
The Be-binary star ζ Tau shows periodic behaviour in the radial velocity of the HeI 6678 absorption line. There is a serious request from professional astronomers to amateurs to contribute their observations to the monitoring of this parameter. Fortunately it´s fairly easy, even with relative (...)


Halpha radial velocity observations of γ Cas (News)

Sunday 6 February 2011 by Ernst Pollmann
Hαlpha radial velocity observations of γ Cas (by Roland Bücke and Ernst Pollmann) Since the investigations by Harmanec et al. [1] in 2000 and Miroshnichenko et al. [2] in 2002, the radial velocity behaviour of the Hαlpha-emission and its period of 203 days has been known. In September 2006 the (...)


Periodic behavior of the HeI6678 emission in δ Sco (News)

Friday 8 January 2010 by Ernst Pollmann
The spectral range 6500-6700 Å includes both Halpha and the HeI line at 6678 Å, and this report covers our observations made of those two lines. This permits a study of the correlation between their equivalent widths (EWs) and line profiles. A signal-to- noise ratio (as a rule > 400) is (...)


gamma Cas (News)

V-Brightness and Halpha Spectroscopy of the Be-star gamma Cas
Saturday 21 November 2009 by Ernst Pollmann
V-Brightness and Hα-Spectroscopy of the Be-Star γ Cas In addition to the meanwhile probably well known cooperation between AAVSO and „ASPA-“Active Spectroscopy in Astronomy“ concerning the LBV-Star P Cygni, a further similar cooperation between ASPA and the Hungarian variable star observer Ferenc (...)


CHARA/VEGA observations at Mt Wilson (News)

Some complementary Halpha spectra requested !
Saturday 21 November 2009 by Philippe Stee
Dear Friends, we are currently observing Gamma Cas and 48 And and AB Aur (an Herbig Ae star), HD 43445 (Theta Ori) from November 17 to 22, 2009 with the CHARA interferometer (http://www.chara.gsu.edu/CHARA/ ) and the VEGA instrument (http://www-g.oca.eu/gemini/projets/...). We are working on (...)


ProAm 2009 - Meeting at La Rochelle (News)

Tuesday 3 November 2009 by Francois Cochard

Last week (26-29 Oct 2009), we had a great meeting at la Rochelle (France), organized by the CNRS (Centre National de la Recherche Scientifique), about all collaborations between professional and amateur astronomers



V378 And (News)

Sunday 11 October 2009 by desnova

Evolution of the H-alpha line



New features on ArasBeam ! (News)

Sunday 4 October 2009 by Francois Cochard
ArasBeam restarts with some new features : You can select only Ha spectra (or any wavelegnth) in all pages. We can then better focus on Ha observations : the color coding of the stars to be observed is now dedicated to Ha spectra. Of course, you can observe the stars at the wavelength you (...)


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