Matching Stellar Population Models to Bulge Globular Clusters.

Details Matching Stellar Population Models to Bulge Globular Clusters. Matching Stellar Population Models to Bulge Globular Clusters.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1531b&link_type=abstract

Astronomical Journal v.114, p. 1531 (1997)

Astronomy and Astrophysics

Astronomy

43

Globular Clusters: General, Galaxy: Stellar Content, Galaxies: Spiral

Scientific paper

We compare observed color-magnitude diagrams (CMDs) of the three metal-rich bulge globular clusters NGC 6553, NGC 6528 and Terzan 5, and integrated spectral energy distributions (SEDs) of NGC 6528 and 47 Tuc, to theoretical isochrones and model SEDs computed with the code of Bruzual & Charlot (1997, hereafter BC97). The BC97 models provide the evolution in time of the spectrophotometric properties of simple stellar populations (SSPs) for a wide range of stellar metallicity. These models allow us to compare predictions based on different sets of evolutionary tracks and various choices of the stellar spectral libraries with observational data. We conclude that: (a) At least for solar metallicity models, the semi-empirical flux corrections applied by Lejeune et al. (1997a,b) to available grids of synthetic stellar spectra improve the agreement between population model predictions and observations. (b) The adopted reddening and distance moduli for the three clusters seem well determined, since the theoretical isochrones fit quite well the observed CMDs. (c) The overall metallicity of these clusters is close to solar. (d) Based on our CMD and SED models we estimate that the ages of NGC 6553 and NGC 6528 must be ~ 12 +/- 2 Gyr. These are the only two clusters in our sample with main sequence photometry. From the UV-optical SED of 47-Tuc we estimate an age of ~ 14 +/- 2 Gyr.

Affiliated with

Also associated with

No associations

Rating

Matching Stellar Population Models to Bulge Globular Clusters. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Matching Stellar Population Models to Bulge Globular Clusters., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Matching Stellar Population Models to Bulge Globular Clusters. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1768710