Sodium in Faint Stars of NGC 6752

Details Sodium in Faint Stars of NGC 6752 Sodium in Faint Stars of NGC 6752

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312407b&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #124.07; Bulletin of the American Astronomical Society, Vol. 31, p.669

Astronomy and Astrophysics

Astronomy

Scientific paper

Spectra of the Na I D-lines in two subgiant stars (MV +2.2) of the globular cluster NGC 6752 are presented. These stars are of similar brightness and color and are known to possess differing abundances of C and N at their surfaces. Our spectra show that they also exhibit differences in Na I line strengths, with abundance differences of Δ [Na/Fe] = 0.3. The Na abundances correlate with CN band strength, as is also the case for the more luminous NGC 6752 members. This result requires the mechanism responsible for a significant component of the Na differences (as well as the C and N variations) observed in the bright giants to be in operation before the NGC 6752 stars evolve appreciably up the red giant branch. Additional spectra of three main-sequence stars (MV = +5.8) further suggest these abundance differences are actually in place well below the main-sequence turn-off.

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