...$Z = Z_\odot/19$)

$\rm 12 + log~(O/H)_{\odot} = 8.92$(Anders & Grevesse 1989).

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... Peak 2.1 m telescope

Kitt Peak National Observatory (KPNO) is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation (NSF).

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... IRAF

IRAF is the Image Reduction and Analysis Facility distributed by the National Optical Astronomy Observatory, which is operated by the AURA under cooperative agreement with the NSF.

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