On the He burning phases of the Carina dSph
M. Fabrizio, A. Pietrinferni, G. Bono, P.B. Stetson, A.R. Walker, R., Buonanno, S. Cassisi, I. Ferraro, G. Iannicola, M. Monelli, M. Nonino, L., Pulone, and F. Thev\'enin
TL;DR
This study compares theoretical helium burning phases with multiband photometry of the Carina dwarf galaxy, confirming predictions with an alpha-enhanced chemical model and revealing its metallicity spread.
Contribution
It provides the first detailed comparison between predicted He burning phases and observed photometry for Carina, supporting alpha-enhanced models.
Findings
Good agreement with alpha-enhanced predictions
Mean metallicity [Fe/H] ~ -1.8
Observed metallicity spread of 0.4±0.2 dex
Abstract
We performed a detailed comparison between predicted He burning phases and multiband photometry of the Carina dwarf spheroidal galaxy. We found a good agreement with the predictions computed assuming an {\alpha}-enhanced chemical mixture, indicating a mean metallicity [Fe/H] ~ -1.8 with a raw observed peak-to-peak spread in iron abundance of 0.4\pm0.2 dex.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Astronomy and Astrophysical Research