ON THE EVIDENCE FOR A CYANOGEN GRADIENT IN 47 TUCANAE

We have reexamined the evidence for a radial gradient in the distribution of CN strengths among 47 Tue giants (Norris and Freeman 1979). We find apparent differences between the distribution of cyanogen strengths determined from stellar spectra and the distribution determined from photoelectric phot...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1989-09, Vol.101 (643), p.811-815
Main Authors: LANGER, G. E., SHIPMAN, RUSSELL F., WEIDA, MILES J.
Format: Article
Language:English
Subjects:
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
ABUNDANCE
Astronomy
CHEMICAL COMPOSITION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CYANOGEN
DISTRIBUTION
Earth, ocean, space
Exact sciences and technology
GIANT STARS
Globular clusters in the milky way
Globular star clusters
MATHEMATICS
PHOTOMETRY
Randomness
Sampling distributions
Smooth curves
SPATIAL DISTRIBUTION
Spectroscopy
STAR CLUSTERS
STARS
STATISTICS
Stellar Clusters and Associations
Stellar systems. Galactic and extragalactic objects and systems. The universe
VARIATIONS
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Summary:We have reexamined the evidence for a radial gradient in the distribution of CN strengths among 47 Tue giants (Norris and Freeman 1979). We find apparent differences between the distribution of cyanogen strengths determined from stellar spectra and the distribution determined from photoelectric photometry for stars in the same (outer) region of the cluster. This, together with the expected random variations in the observed distributions for a small number (~ 30) of stars, leads us to conclude that the available evidence for a CN gradient in 47 Tue is suggestive but not compelling. A more uniform set of observations for a larger sample of stars would obviously settle the issue.
ISSN:0004-6280
1538-3873
DOI:10.1086/132501