Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-05-15
Astronomy and Astrophysics
Astrophysics
5 pages including 2 Postscript figures. To appear in the proceedings of "Spectrophotometric Dating of Stars and Galaxies," eds
Scientific paper
We are using optical/IR surface brightness fluctuations (SBFs) to validate the latest stellar population synthesis models and to understand the stellar populations of ellipticals. Integrated light and spectra measure only the first moment of the stellar luminosity function (\Sigma n_i * L_i). Since SBFs also depend on the second moment (\Sigma n_i * L_i^2), they provide novel information, in particular about the reddest, most luminous RGB and AGB stars, which are the most difficult stars to model. SBFs can also provide useful new constraints on the age/metallicity of unresolved stellar populations in ellipticals. Finally, developing accurate stellar population models benefits several aspects of SBF distance measurements to galaxies.
Charlot Stephane
Graham James R.
Liu Michael C.
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