Asteroseismology in NGC 6134

This cluster has become a key object in the attempt to combine the use of open clusters and the use of variable stars in a new and better test of the theory of stellar evolution. The efforts so far consist of the folllowing activities:

1. Team: S. Frandsen, M. Viskum, H. Kjeldsen, IFA, Aarhus University and L. Balona, C. Koen, SAAO, Cape Town, South Africa
   
   Multisite CCD photometry of a field in NGC 6134. Six delta Scuti stars were located and periods determined. The results have ben published in A&A.
   
2. Team: S. Frandsen, M. Viskum, H. Kjeldsen, H. Bruntt, IFA, Aarhus University
   
   Strømgren photometry of NGC 6134 and spectroscopy of individual stars. The idea is to get better determinations of luminosities and effective temperatures for the variable stars and to determine the average metal content in the cluster stars. Also we want to measure the rotation and to look for possible systematic differences between variables and the non-variables. The data have been obtained at the 1.5m danish telescope at La Silla using the DFOSC instrument.
   

3. Team: N. Audard, University of Vienna, Austria and S. Frandsen, H. Kjeldsen, IFA, Aarhus University
   
   An interpretation of the observations is in progress. We try to compute evolutionary models that fit the magnitudes and colours of the stars, and which also have oscillation spectra that mtathc the oberved periods. A preprint exists, but a final paper awaits the reduction of the new data (see above)

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Last updated Aug. 30, 1996