Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..482b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 482-496.
Astronomy and Astrophysics
Astrophysics
54
Astronomical Spectroscopy, Carbon, Cn Emission, Globular Clusters, Main Sequence Stars, Nitrogen, Star Distribution, Cyanogen, Magnesium, Stellar Composition
Scientific paper
The nature of AN-band strangth variations among upper MS stars in 47 Tuc is characterized, with particular emphasis on the results from the main-sequence (MS) stars. The CTIO 4-m telescope, RC spectrograph, and '2D-Frutti' detector were used to obtain spectra for 20 stars. The observed C and N abundance variations are impossible to reproduce with the assumptions of mixing involving only C-N-processed material and initial C and N abundances appropriate to either the CN-normal stars or the solar ratio. Adding the possibility of the O-N-cycle mixing will allow total C + N + O to be conserved. The C and N abundance differences are very similar to the differences observed among the more luminous cluster stars. Any discussion of mechanisms for altering the surface C, N, and O abundances of evolved stars must allow for a significant population of upper-MS stars with strong CN bands.
Bell Roger A.
Briley Michael M.
Hesser James Edward
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