Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...200...68b&link_type=abstract
Astrophysical Journal, vol. 200, Aug. 15, 1975, pt. 1, p. 68-81.
Astronomy and Astrophysics
Astrophysics
300
Absorption Spectra, Abundance, Cepheid Variables, Galactic Clusters, Globular Clusters, Metals, Astronomical Spectroscopy, Calcium, Image Tubes, Line Spectra, Stellar Spectra, Titanium
Scientific paper
Results are reported for image-tube scanner measurements of Preston's (1959) metal-abundance indicator and metallic-line absorption in the G-band region (4285 to 4317 A) of 47 RR Lyrae stars in 12 galactic globular clusters and 67 RR Lyrae field stars. The relationship (Fe/H) is defined and determined from curve-of-growth analyses of 13 RR Lyrae field stars, while a comparison of metal-abundance vs metallic-line absorption relationships derived for the field and cluster stars indicates that both groups can be calibrated in the same way. Based on this calibration, (Fe/H) values are deduced for the globular-cluster stars and the clusters themselves. It is found that the alpha-rich phenomenon is present in these stars and is confined to calcium and titanium.
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