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| Paper: |
Constraining Star Formation in Old Stellar Populations from Theoretical Spectra |
| Volume: |
374, From Stars to Galaxies: Building the Pieces to Build Up the Universe |
| Page: |
369 |
| Authors: |
Peterson, R.C. |
| Abstract: |
We are calculating stellar spectra using Kurucz codes, Castelli
models, and Kurucz laboratory lines plus guesses; but must first finish adjusting
gf values to match stars of solar metallicity and higher. We show that even now,
1D LTE spectral calculations fit a wide range of stellar spectra (from A to K
types) over 2200Å-9000Å once gf values are set to optimize them. Moreover, weighted coadditions of spectral calculations can be constructed that match M31 globular clusters over this entire wavelength range. Both stellar and composite grids will be archived on MAST. The age-metallicity degeneracy can be broken, but only with high-quality data, and only if rare stages of stellar evolution are incorporated where necessary. |
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