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A high-spectral-resolution study of abundances and isotopic composition of BHB stars in NGC 6397 and NGC 6752

Published online by Cambridge University Press:  18 January 2010

S. Hubrig ,
F. Castelli ,
G. De Silva ,
J. F. González ,
Y. Momany ,
M. Netopil  and
S. Moehler
S. Hubrig
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
F. Castelli
Affiliation:
Instituto Nazionale di Astrofisica–Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
G. De Silva
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
J. F. González
Affiliation:
Complejo Astronómico El Leoncito, Casilla 467, 5400 San Juan, Argentina
Y. Momany
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
M. Netopil
Affiliation:
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Vienna, Austria
S. Moehler
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
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Abstract

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Large abundance anomalies have previously been detected in horizontal-branch B-type stars. We present the first high-resolution study of isotopic anomalies and chemical abundances in six horizontal-branch B-type stars in the globular clusters NGC 6397 and NGC 6752, carried out with UVES on the VLT and compare them to those observed in chemically peculiar main-sequence stars.

Keywords

diffusionstars: abundancesstars: chemically peculiarstars: horizontal-branchstars: fundamental parametersstars: Population IIglobular clusters: individual (NGC 6397, NGC 6752)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 421
Copyright
Copyright © International Astronomical Union 2010