Photometric entropy of stellar populations and related diagnostic tools

Details Photometric entropy of stellar populations and related diagnostic tools Photometric entropy of stellar populations and related diagnostic tools

2005-09-20

arxiv.org/abs/astro-ph/0509602v1

Astronomy and Astrophysics

Astrophysics

13 pages and 9 figures. An invited contribution to "Resolved Stellar Populations", Cancun (Mexico) Apr 2005. To appear on the

Scientific paper

We discuss, from a statistical point of view, some leading issues that deal with the study of stellar populations in fully or partially unresolved aggregates, like globular clusters and distant galaxies. A confident assessment of the effective number and luminosity of stellar contributors can provide, in this regard, a very useful interpretative tool to properly assess the observational bias coming from crowding conditions or surface brightness fluctuations. These arguments have led us to introduce a new concept of "photometric entropy" of a stellar population, whose impact on different astrophysical aspects of cluster diagnostic has been reviewed here.

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