Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5821d&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.21; Bulletin of the American Astronomical Society, Vol. 39, p.837
Astronomy and Astrophysics
Astronomy
Scientific paper
We demonstrate a Bayesian technique to invert color-magnitude diagrams of main-sequence and white dwarf stars to reveal the underlying cluster properties of age, distance, metallicity, and line-of-sight absorption, as well as individual stellar masses. The advantages our technique has over traditional analyses of color-magnitude diagrams are objectivity, precision, and explicit dependence on prior knowledge of cluster parameters. Within the confines of a given set of often-used models of stellar evolution, the initial-final mass relation, and white dwarf cooling, and assuming photometric errors that one could reasonably achieve with the Hubble Space Telescope, our technique yields exceptional precision for even modest numbers of cluster stars. To test the accuracy of our method, we apply our technique to a large set of data on the well-studied Hyades open cluster. We explore the dependence of our results on the choice of priors for cluster parameters, the number of stars included, and the particular main-sequence and white dwarf cooling models used. We find results generally in agreement with accepted values for the Hyades, even in cases with unrestrictive priors. Further, we find that our technique is limited in large measure by the lack of agreement between theory and observation for the low mass main-sequence models.
de Gennaro Steven
Hippel Ted von
Jeffery Elizabeth
Jefferys William H.
Stein Noah
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