The next GEOS meeting (Strasbourg, May 14-16) is approaching.
The meeting will be kindly hosted by the Strasbourg Observatory.

I suggest to met on Saturday May 14 at 14.30 in front of the
Observatory. The meeting will start at 15.00 and will close
around 12.00 on Monday May 16.

Here some preliminary details provided by Michel Dumont:

- L'Observatoire nous a réservé un petit amphithéâtre d'environ 40 à 50 places.
Il est très pentu ! Il est équipé d'un vidéo projecteur et j'ai les coordonnées
de la personne à joindre pour avoir la wifi. Cet amphi est juste à côté du hall
d'entrée où se trouve une grande table ronde où nous prendrons les collations
(samedi en milieu d'après-midi, dimanche matin, dimanche après-midi et lundi matin).
La clé sera confiée à Alexandre COIRIER quelques jours avant et il me la
remettra à notre arrivée.

- L'hôtel IBIS Budget est situé juste en face de la gare. Le trajet (à pied)
Hôtel-Observatoire prend 25 min. Un plan de Strasbourg sera envoyé à chaque
participant ayant réservé une chambre. Il est possible d'effectuer ce trajet en tramway.

- Le repas de dimanche midi aura lieu dans un restaurant alsacien typique
très proche de la cathédrale; le trajet Observatoire- Restaurant est aussi
voisin de 25 min. Il y aura deux menus possibles.

The announced participants are:
Roland Boninsegna, Jacqueline Vandenbroere, Ennio Poretti, Stephane Ferrand,
Michel Dumont, Merce Correa, R. Marcos, Reinhold Auer, Anton Paschke,
Josep Vilalta, Jean-Francois Le Borgne, Juan Fabregat, Francesco Fumagalli.

***   Other participants are welcome !!!  ***
***   Please contact Michel Dumont as soon as possible ***

Details about the payment of the stay at the hotel (2 nights) and the
coffee-breaks will be given soon.

Only a few talks have been submitted so far:

Ennio Poretti - The GEOS observational insights into the Blazhko effect
Josch Hambsch - Recent studies of several RR Lyr stars with Blazhko effect
Josch Hambsch - 5 years Remote Observatory Atacama Desert (ROAD)
Jacqueline Vandenbroere - Les correlations entre les caracteristiques des RRab
Michel Dumont - Variations a faible amplitudes dans les courbes visuelles

*** I kindly ask you to provide other contributions ***

We have to discuss about the GEOS participation to the BAV meeting
(Hamburg, Sep. 17-18).

The programme will be refined and updated in the next weeks.

The GEOS Annual Meeting will be held at Strasbourg Observatory during the Pentecost weekend.


It will begin Saturday, May 14, 2016 at 14h and ends Monday, May 16 at 12h.


Strasbourg is a tourist town and you have to book hotel rooms as soon as possible.


Please, book your room now  for 14-15 May and 15-16 May nights with DMT,  stating clearly if the room is for ONE or TWO persons!


A tour operator is responsible for reservations at a modest price.


DMT address for booking:  This email address is being protected from spambots. You need JavaScript enabled to view it.




GEOS meeting will take place this year at Aras de los Olmos, Valencia, Spain

during  May 31 - June 2 week-end, just after "6th Iberian Meeting on Asteroseismology” (May 27 - 29).

GEOS members are also invited to attend "6th Iberian Meeting on Asteroseismology". The web page of thIs 

event is here. 

Sessions and accommodation for both events will be at Aras Rural

Prices of accommodation and full board are the following:

  1. €60/day in single hotel room.
  2. €50/day in double hotel room.
  3. €50/day in a wooden cottage  (minimum 3 people per cottage; cottages include two double rooms,                                                                                                                 one single room, one bathroom, kitchen, dining room and living room).

E-mail booking is preferred, in Spanish or English, sent to This email address is being protected from spambots. You need JavaScript enabled to view it., with copy to This email address is being protected from spambots. You need JavaScript enabled to view it. and This email address is being protected from spambots. You need JavaScript enabled to view it.

Please state in your mail that you are booking to attend the "GEOS 2013" meeting, or "6th Iberian"+"GEOS 2013" meetings if you are

also attending the Iberian Meeting on Asteroseismology.

To book or request information by phone, in Spanish or English, call +34 639 196 928. If the call is in English, ask for Silvia.

Booking accommodation with copy to This email address is being protected from spambots. You need JavaScript enabled to view it.  and/or This email address is being protected from spambots. You need JavaScript enabled to view it. will confirm

your registration to GEOS meeting.

Registration to  "6th Iberian Meeting on Asteroseismology" can be done on line here.

If your intention is to make a presentation please send title and expected duration as soon as possible to Juan :  This email address is being protected from spambots. You need JavaScript enabled to view it. 

with copy to  This email address is being protected from spambots. You need JavaScript enabled to view it.


   Asterosismology Meeting GEOS
  (May 27 – 29, 2013) (May 31 – June 2, 2013)
Roland Boninsegna   X
Jose Bosch   X
Jaime Busquets   X
Laurent Corp     X
Mercè Correa    X
Juan Fabregat X X
Jean-François Leborgne    (Via Skype)
Raymonde Mat   X
Ramon Moliner    X
Ennio Poretti    X
Luis Rivas     X
Joseph Remis  X X
Jacqueline Vandenbroere   X
Alejandro Vera   X
Josep M. Vilalta             X


Schedule :


Author Title Date & Time Link
Ennio Poretti Stellar Pulsations in the Exoplanet Era 31/05/2013 10:00 MEET012
Juan Fabregat  6th Iberian Meeting on Asterosismology : Identifying seismology targets from H-alpha photometric surveys  31/05/2013 14:00 MEET018
All AVA & University Observatories Visit 31/05/2013 16:00  
Joseph Remis Administration and accounting. 31/05/2013 19:00  
Alejandro Vera & Jose Bosch Observations at Aras de los Olmos AVA observatory 31/05/2013 20:00 MEET011
Jacqueline Vandenbroere Long term variations of RR Lyr periods. 01/06/2013 09:30 MEET014
Laurent Corp Sun SID measurements 01/06/2013 10:30 MEET015
Laurent Corp Eclipsing Binaries: Results and prospects 01/06/2013 12:00 MEET016
Josep M. Vilalta & Ramon Moliner. Nuestros métodos y experiencias en la observación de estrellas variables RR Lyrae. 01/06/2013 16:00 MEET017
Jean-François Le Borgne Skype Participation 01/06/2013 16:00  
Roland Boninsegna How to use the Excel tool to follow RR Lyr period variations. 01/06/2013 17:45 MEET019

Geos meeting 2014 is now running at Ca" del Monte


These are the participants:

Reinhold Auer
Roland Boninsegna
Laurent Corp
Mercedes Correa
Juan Fabregat

Stéphane Ferrand
Francesco Fumagalli
Jean-Francois Le Borgne
Raymonde Mat
Ramon Moliner
Anton Paschke
Ennio Poretti
Joseph Remis
Robert Uhlar
Jacqueline Vandenbroere
Josep M. Vilalta

The scientific programm is as follows :

Friday May 9

10.00   F. Barbaglia      -   Welcome and logistics
10.15   L. Corp           -   OO Aql
11.00   F. Fumagalli      -   New variable stars in Perseus
11.40   J. Fabregat      -   The quest for Maia stars

13.00   Lunch

15.00   J. Vandenbroere  -   The change in the periods  of galactic RRab stars
16.00   L. Corp and R. Boninsegna    -   An observing campaign on V729 Cyg

16.45   Break

17.15   J.F. Le Borgne and E. Poretti   -   RR Lyr observed with VTTs and Kepler ( MNRAS publication - Arxiv )

18.15   All        -  Discussion on the results shown today

Saturday  May 10

9.15   J. Fabregat     -    Astronomical spectroscopy with Amateur Equipment

10.30   Break

11.00   J.F. Le Borgne  -    Real-time demonstration on how to choose comparison stars
12.00   L. Corp         -    Interesting stars for future monitorings

13.00   Lunch

15.00   J.F. Le Borgne  -   New functions at the RR Lyr website
16.00   Open discussion on the methods to search for periods

16.45  Break

17.15  Time to be assigned

Sunday May 11

9.30-12.00      Administrative aspects of the GEOS

We will take the occasion offered by the

"Pro-Am Conference on Stellar Astrophysics"

planned from September 28th to October 1st, 2012 in Onet-Le-Chateau
(close to Rodez,  France), to have our annual GEOS meeting
on the same days.   We could discuss GEOS business on Friday
afternoon and/or Monday afternoon.  We strongly encourage
GEOS members
- to register to the Conference and
- to propose  talks
at the site

The detailed agenda of the GEOS meeting is now as follows :

Rodez, september 28, 2012  14h - 18h

  • 14h : opening by Ennio Poretti
  • 14h10 : Jacqueline Vandenbroere : how to publish new elements of 800 RR Lyrae
  • 14h 45 : Roland Boninsegna  : NP Cam, a new RV Tauri star
  • 15h 30 :  Next GEOS meeting at Aras de los Olmos Spain,  may  2013 ?
  • 16h : coffee break
  • 16h 30 : Jacqueline Vandenbroere : call to collaboration for updating of RR Lyrae elements
  • 17 h : updating of the priority program.

It will also be possible to organize a technical workshop on the time-series analysis
after the Conference, very probably in Toulouse.
The  GEOS members interested in the technical workshop are requested to contact  Jean-Francois Le Borgne and
Ennio Poretti in order to  evaluate the  feasibility.