... KPNO

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

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... Alto

German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy.

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... (MMT)

The MMT Observatory is a joint facility of the Smithsonian Institution and the University of Arizona.

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... telescope

W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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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 Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation (NSF).

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... MIDAS

Munich Image Data Analysis System, provided by the European Southern Observatory (ESO).

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...$Z_\odot$/26.

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

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