Ca II H and K Photometry on the UVBY System. III. The Metallicity Calibration for the Red Giants

Details Ca II H and K Photometry on the UVBY System. III. The Metallicity Calibration for the Red Giants Ca II H and K Photometry on the UVBY System. III. The Metallicity Calibration for the Red Giants

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1922a&link_type=abstract

The Astronomical Journal, Volume 116, Issue 4, pp. 1922-1932.

Astronomy and Astrophysics

Astronomy

28

Stars: Abundances, Stars: Population Ii, Techniques: Photometric

Scientific paper

New photometry on the uvby Ca system is presented for over 300 stars. When combined with previous data, the sample is used to calibrate the metallicity dependence of the hk index for cooler, evolved stars. The metallicity scale is based upon the standardized merger of spectroscopic abundances from 38 studies since 1983, providing an overlap of 122 evolved stars with the photometric catalog. The hk index produces reliable abundances for stars in the [Fe/H] range from -0.8 to -3.4, losing sensitivity among cooler stars due to saturation effects at higher [Fe/H], as expected.

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