Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..81..179s&link_type=abstract
Astrophysics and Space Science, vol. 81, no. 1-2, Jan. 1982, p. 179-197.
Astronomy and Astrophysics
Astrophysics
16
Abundance, Classifications, Globular Clusters, Spatial Distribution, Stellar Evolution, Chemical Composition, Eccentric Orbits, Helium, Metallic Stars, Spectrum Analysis
Scientific paper
The Pilachowski et al. (1980a-e) scale is used to determine the metallicities of 75 globular clusters, in light of the slopes of their giant branches in the V, B-V diagram where clusters of that type, with horizontal branch morphology, form two sequences: (1) a vertical one with blue horizontal branches and a forbidden line Fe/H ratio from -2.2 to -1.2; and (2) a diagonal one with horizontal branches changing from blue to red, parallel with an increase in metallicity from -1.8 to -1.0. It is suggested that the horizontal branch morphology differences of the cluster groups are caused by the difference in age, which is determined to be on the order of 1-2 billion years, and it is shown that integrated, reddening-free qualities and integrated spectral types cannot be used to determine metallicity without a previous division of clusters into groups.
No associations
LandOfFree
Two-dimensional classification of 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 Two-dimensional classification of globular clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-dimensional classification of globular clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1455266