Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results

Details Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results

2002-11-08

arxiv.org/abs/astro-ph/0211169v1

Astronomy and Astrophysics

Astrophysics

41 pages with 7 figures. Accepted by the Astronomical Journal. Paper I and II appeared as astro-ph/0208188 and astro-ph/020814

Scientific paper

10.1086/345961

The color-magnitude diagrams (CMDs) of three intermediate-age LMC clusters, NGC 2173, SL556 and NGC2155 are analyzed to determine their age and metallicity basing on Padova stellar models. Synthetic CMDs are compared with cluster data. The best match is obtained using two fitting functions based on star counts in the different bins of the cluster CMD. Two different criteria are used. One of them takes into account the uncertainties in the color of the red clump stars. Given the uncertainties on the experimental values of the clusters metallicity, we provide a set of acceptable solutions. They define the correspondent values of metallicity, age, reddening and distance modulus (for the assumed IMF). The comparison with Padova models suggests for NGC 2173 a prolonged star formation (spanning a period of about 0.3 Gyr), beginning 1.7 Gyr and ending 1.4 Gyr ago. The metallicity Z is in the range 0.0016 $-$ 0.003. Contrary to what suggested for NGC 2173 a period of extended star formation was not required to fit the SL 556 and the NGC 2155 observations. For SL 556 an age of 2.0 Gyr is obtained. The metallicity value is in the range 0.002 $-$ 0.004, depending on the adopted comparison criterium. The derived age for NGC 2155 is 2.8 Gyr and its metallicity Z is in the range 0.002 $-$ 0.003. The CMD features of this cluster suggest that a more efficient overshoot should be adopted in the evolutionary models.

Affiliated with

Also associated with

No associations

Rating

Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results 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 Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-469701