An improved metal abundance calibration for the Washington system

Details An improved metal abundance calibration for the Washington system An improved metal abundance calibration for the Washington system

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1836g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1836-1869.

Astronomy and Astrophysics

Astronomy

80

Abundance, Metallicity, Open Clusters, Stellar Spectrophotometry, Calibrating, G Stars, K Stars

Scientific paper

The determination of metal abundances for individual giants from Washington photometry is revised, with several significant improvements incorporated. The solar-abundance two-color relations are revamped with the inclusion of new observations of a large sample of solar-abundance giants with small reddenings, especially those with late-K spectral types. The new relations are very similar to the original ones derived in C76 except for a zero-point offset. A new temperature index, M-T2, is investigated, as well as a new abundance index, C-T1, in addition to the standard indices. The M-T2 index has a much broader baseline and thus a much larger range than T1-T2, and is therefore less susceptible to photometric errors. The significant decrease in abundance sensitivity for cooler stars, suspected by previous investigations, is confirmed by including observations of a number of giants with a range in temperature in each of a large sample of open and globular clusters. A procedure for correcting the abundance indices for cool stars is derived which significantly improves the metallicity determination.

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