An empirical approach to the location of the theoretical isochrones in the observational plane

Bibcode
1988A&A...206...63A
Arribas, S.; Martinez Roger, C.
Bibliographical reference

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 1, Nov. 1988, p. 63-73.

Advertised on:
11
1988
Number of authors
2
IAC number of authors
2
Citations
35
Refereed citations
32
Description
A new empirical calibration of the (B-V) index versus the three fundamental stellar parameters T(eff), (Fe/H), and log g is presented whose range of validity is adequate to analyze the main sequence and turnoff regions of most of the stellar cluster systems. Significant systematic differences are found between this new calibration and previous ones based on model atmosphere predictions. On the one hand, solar abundance models are systematically too blue for T(eff) between 8000 K and 6500 K and too red for T(eff) between 6500 K and 5000 K. On the other hand, it appears that current atmospheric models are underestimating the variation of the (B-V) color due to metallicity. When the new calibration is used to compare recent high-quality color-magnitude diagrams with the revised VandenBerg isochrones, very good agreement is found for the metal-rich or moderately poor clusters, but discrepancies are found for the most metal-poor clusters.
Type
Refereed
Stellar evolution
Brightness temperature
Main sequence stars
Star clusters

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