The integrated spectra of M32 and of 47 Tuc: A comparative study at high spectral resolution

Details The integrated spectra of M32 and of 47 Tuc: A comparative study at high spectral resolution The integrated spectra of M32 and of 47 Tuc: A comparative study at high spectral resolution

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..206r&link_type=abstract

The Astronomical Journal, vol. 107, no. 1, p. 206-229

Astronomy and Astrophysics

Astronomy

101

Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Metallicity, Spectral Resolution, Stellar Spectra, Abundance, Astronomical Photometry, Chemical Composition, Spectrum Analysis, Star Formation

Scientific paper

Integrated spectra have been obtained for the elliptical galaxy M32 and for the 'metal-rich' Galactic globular cluster 47 Tuc. The spectra cover the wavelength interval lambda lambda 3800-4400 A at a resolution of 2.5 A full width at half maximum (FWHM) and S/N ratio of approximately 100:1. Similar data have been acquired for a library of 191 individual stars, and, to support the 47 Tuc observations, integrated spectra of four additional metal-rich Galactic globular clusters have been obtained. These observations are used to compare in detail the integrated spectra of M32 (the most extensively studied elliptical galaxy) and 47 Tuc (the best-studied metal-rich Galactic globular cluster). Although M32 and 47 Tuc have similar optical broadband colors and overall spectral types, when viewed at 2.5 A resolution spectra numerous subtle differences between their integrated are clearly visible. A system of 13 spectral indices, many of them originally defined in Rose (1984), has been used to quantify these differences. Altogether twelve diagnostic diagrams are presented to illustrate the manner in which the integrated spectrum of M32 differs from that of 47 Tuc. These diagrams are used to place several strong constraints on the stellar populations in these two systems.

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