Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..437h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 437-455.
Astronomy and Astrophysics
Astrophysics
15
Color-Magnitude Diagram, Globular Clusters, Stellar Composition, Stellar Spectra, Subgiant Stars, Abundance, Astronomical Catalogs, Histograms, Late Stars, Line Spectra, Radial Velocity
Scientific paper
SIT Vidicon spectra with 3 - 4 Å resolution have been obtained with the CTIO 4 m telescope for a nearly complete sample of faint subgiant stars for the peculiar southern globular cluster ω Centauri. From radial velocities, fewer than 25% of the redder stars are cluster members, while 75% of the bluer stars are members. It is shown that there is a range of [M/H] among subgiants at a given B-V, and that the stars with different abundances all follow isochrones for an age of about 18×109yr. The abundance histograms for ω Cen's bright giant, RR Lyrae, and faint giant and subgiant stars show a similar, relatively uniform distribution between [M/H] = -1.0 and -2.0, with a few stars being as metal-rich as [M/H] ≈ -0.7. These results show that the observed abundance spread among giants in ω Cen originates near, if not on, its main sequence.
Bell Roger A.
Cannon Russell D.
Harris Gretchen L. H.
Hesser James Edward
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