Relative ages of inner-halo globular clusters

Details Relative ages of inner-halo globular clusters Relative ages of inner-halo globular clusters

1999-01-07

arxiv.org/abs/astro-ph/9901067v1

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, requires paspconf.sty. To be published in: B. K. Gibson, T. S. Axelrod and M. E. Putman (eds.), "The Third

Scientific paper

We present preliminary results from our on-going survey of Galactic globular clusters relative ages. The investigation is based on V,I images obtained at the ESO and La Palma telescopes, which make up the largest homogenous photometric catalog to date. A second, independent sample of globulars observed in the B, V bands provides an independent check of the results based on the groundbased data. Age-dependent morphological parameters are measured on the CMDs and are compared with two sets of independent models. We find that the so-called ``vertical'' and ``horizontal'' methods give compatible results when the groundbased dataset is used, and that in both cases the observed trends are well reproduced by the isochrones. The interpretation of the HST data trends are more controversial, due to both a stronger dependence on metallicity, and to the discrepancies in the theoretical loci. Our data clearly show that (a) no age dispersion can be revealed for the bulk of the GGCs at the ~1 Gyr level; (b) no age-metallicity relation is found, although the age dispersion is somwhat larger for intermediate and higher metallicity clusters; and (c) there is no clear trend with the galactocentric distance, out to the present limits of our survey (R(GC) < 22 Kpc).

Affiliated with

Also associated with

No associations

Rating

Relative ages of inner-halo 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 Relative ages of inner-halo globular clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relative ages of inner-halo globular clusters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-207753