CA II K line - A new metallicity indicator for RR Lyrae stars

Details CA II K line - A new metallicity indicator for RR Lyrae stars CA II K line - A new metallicity indicator for RR Lyrae stars

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.2168c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, June 1991, p. 2168-2176.

Astronomy and Astrophysics

Astronomy

16

Blue Stars, Giant Stars, K Lines, Metallicity, Stellar Oscillations, Abundance, Calcium, Charge Coupled Devices, Stellar Spectra

Scientific paper

CCD spectra, which cover wavelengths between 3900 and 4400 A at a dispersion of 43 A/mm, are obtained for 26 field RR Lyrae variables of Bailey type ab to verify Preston's delta-S calibration scale. The width of the Ca II K line is found to correlate very well with the direct Fe/H values, particularly when Fe/H = 0.53 W-prime(K) - 3.08, where W-prime(K) is the width of the K line corrected for interstellar contribution. The K line equivalent is shown to be a reliable method for deriving the Fe/H abundance from low resolution spectra taken from these stars.

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