Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..267c&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Physics
Stars Planetary Systems, Stars Distances, Stars Fundamental Parameters
Scientific paper
This paper discusses the main physical parameters of 99 extra-solar planet stars, (hereafter ESPs), out of 117 of such stars identified up to now. The 99 ESPs possess reliable Hipparcos parallaxes, leading to trustful absolute magnitudes. For many of them their space velocities, (U,V,W), are known also. The effective temperatures, spectroscopic gravities and chemical compositions have been derived from high S/N, high resolution, spectroscopic detailed analyses available in the literature. Taking into account the metallicity of each star, the ages of the sufficiently evolved ESPs have been estimated , very homogeneously, using isochrones, obtained from metalpoor, solar-metal-normal, and metal-rich stellar structure models. The results are discussed using statistical distributions obtained for each of the physical parameters under investigation. An interesting conclusion emerges from this research: the age-distribution of the evolved ESPs, is bimodal: reflecting the mean age of the thindisc, (4 to 6 Gyr) and the presence of an older-disc ESPspopulation of about 10-12 Gyr.
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