State-of-the-Art Metal Abundances For Field RR Lyrae Variables

Details State-of-the-Art Metal Abundances For Field RR Lyrae Variables State-of-the-Art Metal Abundances For Field RR Lyrae Variables

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aspc...92..367c&link_type=abstract

Formation of the Galactic Halo...Inside and Out, ASP Conference Series, Vol. 92, 1996, Heather Morrison and Ata Sarajedini, eds.

Physics

Scientific paper

We present abundance analysis for 10 field ab-type RR Lyraes, using high S/N (>200), moderately high resolution ( ~ 18000) CCD spectra to obtain accurate metallicities. A new temperature scale was determined and non-LTE effects were fully taken into account. The derived metal abundances of the program stars span the range -2.50 < [Fe/H] < +0.17. We used our new [Fe/H] abundances, as well as values from Butler and coworkers (corrected to our system), to obtain a revised calibration of the Delta S index (Preston 1959): $[Fe/H] = -0.194(+/- 0.011)Delta S - 0.08 (+/- 0.18) $ Our new metallicity scale is then stretched on both low and high metallicity ends with respect to Butler's (1975) calibration.

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