CN and CH variations on the M5 subgiant branch

Details CN and CH variations on the M5 subgiant branch CN and CH variations on the M5 subgiant branch

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..612b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 10, 1992, p. 612-621.

Astronomy and Astrophysics

Astrophysics

28

Abundance, Globular Clusters, Late Stars, Stellar Spectra, Subgiant Stars, Cyanogen, Line Spectra, Milky Way Galaxy, Spectrum Analysis

Scientific paper

The study obtains moderate-resolution blue spectra using the Palomar 5 telescope for a sample of 14 subgiants and six giants in the Galactic globular cluster M5. These data were combined with MMT spectra of subgiants to yield 3883-A CN band strength indices for 20 stars with MV greater than +1. It is inferred from the fact that large C and N abundance variations are found among such relatively unevolved stars that the CN distribution detected among the brighter stars is at least in part due to a preexisting variation. It is suggested that two abundance-altering mechanisms are responsible for the C and N abundance variations in M5 - one having produced early abundance inhomogeneities on the subgiant branch or main sequence, and the second being red-giant-branch ascent mixing.

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