The Effect Of Alpha-Element Enhancement On Surface Brightness Fluctuation Magnitudes And Broad-Band Colors

Abstract

We present the effects due to alpha-element enhancement on surface brightness fluctuation magnitudes and broad-band colors in order to investigate the calibration zero-point. We study these effects at ages covering 0.1 to 13 Gyr and metallicities of Z=0.0003 to 0.04 using the Teramo group's isochrones, BaSTI. Our preliminary results indicate that alpha-enhanced models are needed to match massive red galaxies while solar-scaled models are fine for dwarf blue galaxies to reproduce their independently estimated ages and metallicities.

To appear in the proceedings for IAU symposium 241. "Stellar Populations as Building Blocks of Galaxies", Editors: R.F. Peletier, A. Vazdekis. Relevant materials are also at http://astro.wsu.edu/hclee/hclee_208_AAS_10_07.pdf and http://www.astro.rug.nl/~sctrager/FTSPM/Lee_alpha.pdf

References in corpus (4)

• A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• A Large Stellar Evolution Database for Population Synthesis Studies. III. Inclusion of the full Asymptotic Giant Branch phase and Web tools for stellar population analyses
• Early-type Galaxy Distances from the Fundamental Plane and Surface Brightness Fluctuations