Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..926g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 926-932. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
54
Abundance, Blue Stars, Globular Clusters, Horizontal Branch Stars, Hot Stars, Angular Velocity, Helium, Iron, Magnesium, Phosphorus, Radial Velocity, Silicon, Stellar Temperature
Scientific paper
High-resolution spectra of two blue stars on the horizontal branch of the metal-poor globular cluster NGC 6752 have been obtained with an echelle spectrograph and a CCD detector on the CTIO 4 m telescope. A helium underabundance is confirmed in the blue star CL 1083 (Teff = 16,000 K). An overabundance of iron by a factor of 50 compared to the cluster metallicity is also obtained. No abundance anomaly is measured in the cooler star CL 1007 (Teff = 10,000 K). Presumably all stars of this cluster had the same original abundances; hence, the anomalies must be explained by the different properties of individual stars. These results are discussed in the context of the diffusion model originally developed to explain the He underabundance in horizontal-branch stars.
Demers Serge
Glaspey John W.
Michaud Georges
Moffat Anthony F. J.
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