Spectroscopic evidence for a wide range in abundances among faint subgiant stars in the globular cluster Omega Centauri

Details Spectroscopic evidence for a wide range in abundances among faint subgiant stars in the globular cluster Omega Centauri Spectroscopic evidence for a wide range in abundances among faint subgiant stars in the globular cluster Omega Centauri

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..637b&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 637-646. Research supported by the Natural Sciences and Engineering

Astronomy and Astrophysics

Astrophysics

32

Abundance, Globular Clusters, Late Stars, Stellar Spectra, Subgiant Stars, Carbon, Nitrogen, Radial Velocity, Red Giant Stars, Spectrum Analysis, Stellar Evolution, Stellar Mass Accretion

Scientific paper

Intermediate dispersion spectra are presented for 11 stars on the lower subgiant branch of Omega Cen having B values in the range 16.7-18.4. Five of the stars have radial velocities incompatible with cluster membership, while of the remaining six probable members, five have M/H abundances in the -1.0 to -1.5 range and show signs of carbon depletion. The sixth object, with an M/H value of about -0.5, has an enhanced nitrogen abundance whose factor may be as high as 3.0. The possible reasons for this variation in nitrogen abundance considered are: (1) mixing of the stars during their evolution; (2) differences in abundance at the time of star formation; (3) accretion of material lost by the cluster red giants, and (4) accretion of material lost by a binary comparison.

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