Carbon, nitrogen, and iron-peak abundances for giants in the remote globular clusters NGC 7006 and PAL 13

Details Carbon, nitrogen, and iron-peak abundances for giants in the remote globular clusters NGC 7006 and PAL 13 Carbon, nitrogen, and iron-peak abundances for giants in the remote globular clusters NGC 7006 and PAL 13

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..873f&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 94, Dec. 1982, p. 873-886.

Astronomy and Astrophysics

Astronomy

31

Abundance, Giant Stars, Globular Clusters, Interstellar Extinction, Stellar Spectra, Stellar Spectrophotometry, Carbon, Horizontal Branch Stars, Iron, Metallicity, Nitrogen, Spectrum Analysis, Stellar Color

Scientific paper

Image dissector scanner low resolution spectra have been obtained for giants in the remote NGC 7006 and Pal 13 globular clusters which yield mean iron-peak metallicities of -1.45 and -1.9, respectively. These two clusters are often considered to be 'second parameter' clusters, exhibiting anomalously red branches for their metallicities. While the Pal 13 giants in the present sample exhibit the modest carbon depletions and nitrogen enhancements distinguishing stars in the classical second parameter cluster M3, the giants of NGC 7006 have C and N abundances that are intermediate between those of M3 and M13 giants. Recent suggestions that anomalous overabundances of elements in the CNO group are responsible for the second parameter effect in NGC 7006 are not supported by the present results.

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