TiO band strengths in metal-rich globular clusters. III - Model atmosphere calibration

Details TiO band strengths in metal-rich globular clusters. III - Model atmosphere calibration TiO band strengths in metal-rich globular clusters. III - Model atmosphere calibration

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..161j&link_type=abstract

Astrophysical Journal, Part 1, vol. 258, July 1, 1982, p. 161-164.

Astronomy and Astrophysics

Astrophysics

19

Abundance, Globular Clusters, Late Stars, Spectral Bands, Stellar Atmospheres, Stellar Models, Titanium Oxides, Iron, Metallic Stars, Near Infrared Radiation, Stellar Color, Stellar Spectrophotometry, Stellar Temperature, Titanium

Scientific paper

The present investigation is concerned with approaches for answering questions regarding the age characteristics and the history of the globular cluster system of the Galaxy. Use is made of models described by Johnson et al. (1980). These models and metal-poor members of the same family are employed to obtain a new calibration of TiO band strength measurements in globular cluster giants. The new calibration will make it possible to make use of the main strength of photometric abundance determination relative to high resolution spectroscopy, which is connected with the photometric definition of the continuum points. Even if the line blanketing is complete (i.e., there is no true continuum), there will be no bias in the interpretation, provided that the models really contain the full line opacity. Attention is given to model band strength indices, a correction for gravity variation along the giant branch, and details of metallicity calibration.

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