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


Most recent articles

Most recent articles

Bess Reports

Monday 11 June 2018 par desnova, JJ Broussat
April 2018 March 2018 December 2017 November 2017 July 2017 June 2017 May 2017 April 2017 March 2017 February 2017 November 2016 October 2016 September 2016 July 2016 June 2016 May 2016 April 2016 March 2016 September 2015 (...)

10 candles for the Bess program

Monday 11 June 2018 par JJ Broussat
BeSS is a professional/amateur program that started in 2007. Today it has more than 12,000 spectra for more than 2000 Be stars. BeSS data has been used by more than 53 scientific publications. During the week of October 23 - 27, 2017, we celebrated the tenth birthday of the BeSS program. (...)

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 (...)

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 (...)

BeSS data analysis : Workshop in Meudon

Friday 11 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 (...)

ARAS website

Friday 20 August 2010 par desnova

Astronomical Ring for Access to Spectroscopy


Friday 3 October 2008 par Francois Cochard

BeSS is the Master database which contains original data for ArasBeam

Spectra of a Be star

Friday 3 October 2008 par Francois Cochard

Be list

Tuesday 26 August 2008 par Francois Cochard

List of known Be stars

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