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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33145
Title: Helium abundance in globular clusters: the R-method
Authors: BUZZONI, Alberto 
Pecci, F. F.
Buonanno, R.
Corsi, C. E.
Issue Date: 1983
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 128
First Page: 94
Abstract: A new estimate of the helium abundance, Y, in globular cluster stars has been obtained through the application of the R-method of Iben (1968) to a sample of galactic globular clusters. A new calibration for the (R-Y) relation has been derived. The influence on the calibration of some theoretical uncertainties and of phenomena like mass loss have been analyzed. The procedure, applied to a sample of 15 clusters whose data reach a level of completeness and photometric accuracy enough to give statistically significant results, led to a mean value for Y equal to 0.23 + or - 0.02. A constant Y with varying metal content seems consistent with the data. The distribution of the number ratios of asymptotic and giant branch stars suggests the full development of the semiconvective zone for the stars of all the considered clusters.
URI: http://hdl.handle.net/20.500.12386/33145
URL: https://ui.adsabs.harvard.edu/abs/1983A%26A...128...94B/abstract
ISSN: 0004-6361
Bibcode ADS: 1983A&A...128...94B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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