Statistics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.0302c&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #03.02; Bulletin of the American Astronomical Society, Vol. 31, p.1369
Statistics
Scientific paper
We present the results of a spectroscopic study of aluminum in 85 red-giant-branch (RGB) stars that covers a range of 3.5 magnitudes from the tip of the RGB in the globular cluster M 13. The aluminum abundance distribution is bimodal at all magnitudes according to the statistics determined with the KMM algorithm. The ratio of aluminum-strong to aluminum-normal stars remains constant as a function of V magnitude at 2.00 {+/-} 0.12 (1σ) up to V = 13.1. At brighter magnitudes, this ratio jumps to near 3 due to a sharp decrease in the number of aluminum-normal giants near the RGB tip. Although the analysis still suffers from small-number effects, the results thus far present evidence that deep mixing is occurring on the RGB in M 13 and that at least part of the observed high aluminum abundances are due to this deep mixing. Further analysis compares the aluminum abundances on the RGB to the horizontal-branch morphology in an attempt to discover a relationship between deep (helium) mixing and the second-parameter effect. R.M.C acknowledges the National Academy of Sciences for support of his work.
Cavallo Robert Michael
Nagar Neil M.
No associations
LandOfFree
Evidence for Deep Mixing in the Globular Cluster M 13 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 Evidence for Deep Mixing in the Globular Cluster M 13, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for Deep Mixing in the Globular Cluster M 13 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1735344