On the metallicity of blue horizontal-branch stars in M4 and NGC 6397

Details On the metallicity of blue horizontal-branch stars in M4 and NGC 6397 On the metallicity of blue horizontal-branch stars in M4 and NGC 6397

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..201k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 201-207.

Astronomy and Astrophysics

Astrophysics

14

Blue Stars, Globular Clusters, Horizontal Branch Stars, Metallicity, Stellar Atmospheres, Stellar Spectra, Hot Stars, Interstellar Extinction, Iron, Radial Velocity

Scientific paper

High dispersion spectra (12.5 Å mm-1) were taken of three blue horizontal-branch (BHB) stars with the Cassegrain ITS on the CTIO 4 m telescope, in order to obtain independent estimates of the metal abundances of the globular clusters M4 and NGC 6397. Atmospheric parameters were determined, as well as interstellar reddenings and radial velocities. The authors find [Fe/H] values of -0.4 and -1.4 for BHB stars in M4 and NGC 6397, respectively.

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