Welcome !

ArasBeam is the website dediacted to Be stars amateur observers. Its goal is to organize the spectroscopic observations of Be stars by amateurs from all over the world.

Be stars evolve permanently, and the cause of their evolution is not fully understood. To better understand those evolutions, a regular tracking of as much stars as possible is required : a job accessible to amateur astronomers, and useful for science !

This site, as well as Be Observations Program is developed in collaboration with LESIA team (Observatoire de Paris-Meudon), and is based on data recorded in BeSS database.

You can use this website to study and analyse data already recorded, but you can do still better : join the observers team to multiply our measuements !

If you have questions, if you need questions about instruments, software, targets, and so on, join the distribution list Spectro-l


The most recent articles

The most recent articles

Why do we observe Be stars ?

Sunday 28 July 2013 par Francois Cochard
Be stars are very specific objects to observe in spectroscopy, for several reasons. They are very active stars, which make them great laboratories for stellar physics models. They are not fully understood, despite the huge effort made by the community these last years. Be stars are quite common (...)

Hα-emission and V-correlations as probes of Be stars disks

(by Ernst Pollmann, Wolfgang Vollmann & Ferenc Puscas)
Tuesday 20 December 2011 par Ernst Pollmann
Introduction An interesting discussion among professional Be star disk researchers has, for years, been the question of correlation between the Hα equivalent width (EW) to the UBV brightness [1]. Researchers at the University of Western Ontario (Canada) are currently trying to refine a computer (...)

Short report of the delta Sco periastron passage campaign 2011

Friday 9 December 2011 par Ernst Pollmann
Short report of the delta Sco periastron passage campaign 2011 One of the most interesting astronomical events of this year, at least from view of the astrospectroscopy, was certainly the periastron passage of the Be-binary δ Scorpii. δ Sco is a bright, interferometrically discovered binary (...)

Zet Oph litterature history

Saturday 12 March 2011 par Jean-Noël Terry

Zet oph - historical evolution - see here more recent analysis

SHELIAK litterature and history

Saturday 12 March 2011 par Jean-Noël Terry

Sheliak - bet Lyr - historical evolution and articles

Bet Mon A: historical evolution

Saturday 12 March 2011 par Jean-Noël Terry

Bet Mon A historical evolution

BeSS data analysis : Workshop in Meudon

Sunday 20 February 2011 par 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

Sunday 13 February 2011 par 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

Sunday 13 February 2011 par 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 (...)

4 Her - litterature and history

Friday 11 February 2011 par Jean-Noël Terry

4 Her historical evolution - see more recent BeSS analysis here

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