TiO band strengths in metal-rich globular clusters

Details TiO band strengths in metal-rich globular clusters TiO band strengths in metal-rich globular clusters

Publishing date

Apr 1978

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..580m&link_type=abstract

Journals

Astrophysical Journal, Part 1, vol. 221, Apr. 15, 1978, p. 580-585.

Science

Other

Additional info 2

43

Additional info 3

Abundance, Globular Clusters, Line Spectra, Stellar Spectrophotometry, Titanium Oxides, Galactic Radiation, Giant Stars, Late Stars, M Stars, Red Shift, Stellar Temperature

Type

Scientific paper

Abstract

Observations are reported of the run of TiO band strength (7120 A) with effective temperature for stars at the tip of the giant branch in globular clusters. At temperatures for which the band is strong in field giants, TiO is undetected in clusters of intermediate metallicity. For this result reddening corrections are unimportant. TiO is detected in the coolest stars of the metal-rich clusters, but it is weaker at a given temperature than in the field. With reasonable knowledge of the reddening this permits a ranking of the clusters in metallicity. A preliminary theoretical calibration is given which, for NGC 6171 and M71, yields metallicities in agreement with those obtained by other methods.

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