A library of integrated spectra of Galactic globular clusters

Ricardo P. Schiavon, James A. Rose, Stéphane Courteau, Lauren A. Macarthur

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

We present a new library of integrated spectra of 40 Galactic globular clusters, obtained with the Blanco 4 m telescope and the R-C spectrograph at the Cerro Tololo Inter-American Observatory. The spectra cover the range ∼350-6430 Å with ∼3.1 Å (FWHM) resolution. The spectroscopic observations and data reduction were designed to integrate the full projected area within the cluster core radii in order to properly sample the light from stars in all relevant evolutionary stages. The S/N values of the flux-calibrated spectra range from 50 to 240 Å -1 at 4000 Å and from 125 to 500 Å -1 at 5000 A. The selected targets span a wide range of cluster parameters, including metallicity, horizontal-branch morphology, Galactic coordinates, Galactocentric distance, and concentration. The total sample is thus fairly representative of the entire Galactic globular cluster population and should be valuable for comparison with similar integrated spectra of unresolved stellar populations in remote systems. For most of the library clusters, our spectra can be coupled with deep color-magnitude diagrams and reliable metal abundances from the literature to enable the calibration of stellar population synthesis models. In this paper we present a detailed account of the observations and data reduction. The spectral library is publicly available in electronic format from the National Optical Astronomical Observatory Web site.

Original languageEnglish (US)
Pages (from-to)163-175
Number of pages13
JournalAstrophysical Journal, Supplement Series
Volume160
Issue number1
DOIs
StatePublished - Sep 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Galaxies: evolution
  • Globular clusters: general

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