On the age difference between the oldest Population I and the extreme Population II stars

Details On the age difference between the oldest Population I and the extreme Population II stars On the age difference between the oldest Population I and the extreme Population II stars

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..47..151s&link_type=abstract

Astrophysics and Space Science, vol. 47, Mar. 1977, p. 151-162.

Astronomy and Astrophysics

Astrophysics

12

Galactic Evolution, Hertzsprung-Russell Diagram, Stellar Evolution, Stellar Models, Astronomical Models, Chemical Evolution, Globular Clusters, Star Clusters, Star Distribution

Scientific paper

The age difference between the oldest Population I stars and the extreme Population II stars is investigated by comparison of observational H-R diagrams with theoretical results using the common input physics and computer program for both Populations. Chemical compositions adopted for Population I and II stars are, X=O.7 and Z=O.02, and X=O.7 and Z= 2 x i0~, respectively. Evidence collected indicates that the open cluster NGC 188 and the globular cluster M92 are the representative samples of the oldest Population I and extreme Population II stars, respectively. Comparison between the observed H-R diagrams and theoretical isochrones in terms of the luminosity of the subgiant region and the turnoff point for NGC 188 and M92, respectively, then suggests that there is a significant age difference between Population I and II objects. The uncertainty of the oxygen abundance in the extreme Population II stars and its effect on their age determination is briefly discussed

Affiliated with

Also associated with

No associations

Rating

On the age difference between the oldest Population I and the extreme Population II stars 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 On the age difference between the oldest Population I and the extreme Population II stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the age difference between the oldest Population I and the extreme Population II stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1845396