Revised metal abundances for galactic globular clusters - Preliminary results on the abundance gradient and on the second parameter problem

Details Revised metal abundances for galactic globular clusters - Preliminary results on the abundance gradient and on the second parameter problem Revised metal abundances for galactic globular clusters - Preliminary results on the abundance gradient and on the second parameter problem

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mmsai..52...59c&link_type=abstract

(Consiglio Nazionale delle Ricerche, Meeting, Rome, Italy, May 30, 31, 1980.) Società Astronomica Italiana, Memorie, vol. 52, Ma

Astronomy and Astrophysics

Astronomy

2

Abundance, Astronomical Spectroscopy, Globular Clusters, Metallic Stars, Halos, Hydrogen, Iron

Scientific paper

Homogeneous metal abundances for 94 galactic globular clusters are derived using recent high-quality spectroscopic Fe/H values to calibrate several metallicity indicators. The sample includes 13 HB type 7 clusters, 18 Oosterhoff I clusters, 14 Oosterhoff II clusters, and 14 HB type 1 clusters. The results are shown to be consistent with a metal-abundance gradient in the galactic halo. Evidence is obtained which appears to suggest that, for all clusters except very blue RR Lyrae-poor systems, both the metal abundance and the so-called second parameter have a radial gradient throughout the halo.

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