Spectral Indices of Old Stars as a Function of Alpha Element Abundance Ratios

Details Spectral Indices of Old Stars as a Function of Alpha Element Abundance Ratios Spectral Indices of Old Stars as a Function of Alpha Element Abundance Ratios

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.8507h&link_type=abstract

American Astronomical Society Meeting 203, #85.07; Bulletin of the American Astronomical Society, Vol. 35, p.1343

Astronomy and Astrophysics

Astronomy

Scientific paper

As part of a program to produce fully self-consistent evolutionary synthesis models, we are calculating a large grid of synthetic stellar spectra for low-mass stars with metallicities spanning the range from old, Milky Way globular clusters to massive, early-type galaxies. This grid includes models having both solar abundance ratios and enhanced [alpha/Fe] ratios. From these spectra, we measure the Lick indices, as well as the strengths of the Ca II triplet, the near-infrared CO bands, and a variety of atomic and molecular lines in the H and K bandpasses. In this poster, we show examples of spectral features that vary as functions of temperature, gravity, metallicity, and [alpha/Fe] ratio and discuss their utility in interpreting integrated-light models and observations.
This work is funded by NASA Grant NAG5-10922.

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