Other
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..453m&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 453-456
Other
Scientific paper
Low-resolution spectra of 30 RR Lyrae stars contained in the Hipparcos Input Catalogue have been obtained. The targets were selected from among those for which no measurements were available, or only poor ones, of metallicity and radial velocities in the updated catalogues (Suntzeff et al. 1994; Layden 1994). Metallicities have been obtained according to two different methods; Preston's classic Delta S method and the Freeman & Rodgers (1975) method as adapted by Layden (1994). Based on recent high-resolution spectra and Delta S data compiled from the literature, we have estimated the [Fe/H] versus Delta S relationship. While a slope of -0.20 seems to be the best value fitting our data, in good agreement with recent results, the zero-point of our calibration (0.11) is slightly higher than previous ones. This value brings the Layden metal abundance scale into agreement with those metallicities derived by Suntzeff et al., following the classic Delta S method. Otherwise the globular cluster and RR Lyrae metallicities turn out to be within the same scale when this zero-point value is used.
Alfaro Emilio J.
Martinez-Delgado David
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