Deriving stellar properties from photometry: maximizing information content and minimizing biases

Details Deriving stellar properties from photometry: maximizing information content and minimizing biases Deriving stellar properties from photometry: maximizing information content and minimizing biases

2005-06-13

arxiv.org/abs/astro-ph/0506278v1

Astronomy and Astrophysics

Astrophysics

14 pages, 9 figures. To appear in Resolved Stellar Populations, meeting held in Canc\'un, Mexico, 18-22 April 2005, D. Valls-G

Scientific paper

I study the importance of the accurate calibration of photometric systems in order to produce meaningful comparisons between the observed colors + magnitudes and model SEDs. Possible sources of errors are discussed and two examples are analyzed. I show that well-calibrated Tycho-2 photometry is stable and precise enough for such comparisons. On the contrary, the available calibrations for Johnson UBV photometry yield relative large systematic errors, which has prompted me to develop a new, more precise calibration. The advantages of multicolor photometry over the standard single-color + magnitude diagrams for the derivation of physical properties of stars (elimination of degeneracies, inclusion of multiple parameters, avoidance of linearizing approximations, possibility of a more precise treatment of errors) are discussed through the use of CHORIZOS, a code developed specifically for this purpose.

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