Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34760307l&link_type=abstract
VizieR On-line Data Catalog: J/A+A/476/307. Originally published in: 2007A&A...476..307L
Physics
Stars: Variable
Scientific paper
The theory of stellar evolution can be more closely tested if we have the opportunity to measure new quantities. Nowadays, observations of galactic RR Lyr stars are available on a time baseline exceeding 100 years. Therefore, we can exploit the possibility of investigating period changes, continuing the pioneering work started by V.P. Tsesevich in 1969. We collected the available times of maximum brightness of the galactic RR Lyr stars in the GEOS RR Lyr database (http://dbrr.ast.obs-mip.fr/). Moreover, we also started new observational projects, including surveys with automated telescopes, to characterise the O-C diagrams better. The database we built has proved to be a very powerful tool for tracing the period variations through the ages. We analyzed 123 stars showing a clear O-C pattern (constant, parabolic or erratic) by means of different least-squares methods.
(3 data files).
Acerbi Fabio
Boeer M.
Damerdji Yassine
Klotz Alain
Le Borgne Jean-Franc
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