The anomalous horizontal branch in the Draco system

Details The anomalous horizontal branch in the Draco system The anomalous horizontal branch in the Draco system

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mmsai..50..145t&link_type=abstract

(Workshop on Chemical Inhomogeneities in the Galaxy, Frascati, Italy, May 29-June 2, 1978.) Società Astronomica Italiana, Memori

Other

Abundance, Chemical Composition, Elliptical Galaxies, Galactic Structure, Stellar Evolution, Colorimetry, Helium, Red Giant Stars, Stellar Magnitude, Stellar Models

Scientific paper

The evolutionary status of horizontal branch (HB) stars in the Draco dwarf galaxy (DDG) is reexamined in light of recently computed ZAHB models. A serious discrepancy emerges between the quoted theoretical models and the observed HB. The conclusion is that CNO enhancement can hardly account for this anomaly; more likely, the metal content has been underestimated, otherwise another parameter has to be introduced beside He and age.

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