Galactic Globular-Cluster Metallicity Scale from the Ca II Triplet. I. Catalog

We have obtained 2640 CCD spectra with resolution ~ 4 Å in the region 7250-9000 Å for 976 stars lying near the red-giant branches in color-magnitude diagrams of 52 Galactic globular clusters. Radial velocities of ~ 16 km s⁻¹ accuracy per star determined from the spectra are combined with other crite...

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Bibliographic Details
Published inPublications of the Astronomical Society of the Pacific Vol. 109; no. 738; pp. 883 - 906
Main Authors Rutledge, Glen A., Hesser, James E., Stetson, Peter B., Mateo, Mario, Simard, Luc, Bolte, Michael, Friel, Eileen D., Copin, Yannick
Format Journal Article
LanguageEnglish
Published American Institute of Physics 01.08.1997
Subjects
Apparent magnitude
Astronomical photometry
Error rates
Line spectra
Metal abundance
Pixels
Radial velocity
Stars
Stellar Clusters and Associations
Stellar spectra
Stellar spectral lines
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Summary:We have obtained 2640 CCD spectra with resolution ~ 4 Å in the region 7250-9000 Å for 976 stars lying near the red-giant branches in color-magnitude diagrams of 52 Galactic globular clusters. Radial velocities of ~ 16 km s⁻¹ accuracy per star determined from the spectra are combined with other criteria to assess quantitative membership probabilities. Measurements of the equivalent widths of the infrared calcium triplet lines yield a relative metal-abundance ranking with a precision that compares favorably to other techniques. Regressions between our system and those of others are derived. Our reduction procedures are discussed in detail, and the resultant catalog of derived velocities and equivalent widths is presented. The metal abundances derived from these data will be the subject of a future paper.
ISSN:0004-6280
1538-3873
DOI:10.1086/133958