Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rrls.conf..210w&link_type=abstract
RR Lyrae Stars, Metal-Poor Stars, and the Galaxy, Carnegie Observatories %Astrophysics Series, Vol. 5. Edited by Andrew McWillia
Astronomy and Astrophysics
Astrophysics
Scientific paper
The GAIA satellite is likely to observe thousands of RR Lyrae stars within a small spectral window, between 8470 Å and 8750 Å, at a resolution of 11,500. In order to derive the metallicity of RR Lyrae stars from Gaia, we have obtained numerous spectra of RR Lyrae stars at a resolution of 35,000 with the Apache Point Observatory 3.5 m echelle spectrograph. We have correlated the Ca II triplet line strengths with metallicity as derived from Fe II abundances, analogous to Preston's (1959) use of the Ca II K line to estimate the metallicity of RR Lyrae stars. The Ca II line at 8498 Å is the least blended with neighboring Paschen lines and thus provides the best correlation.
Gomez Thomas
Huang Wenjin
Wallerstein George
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