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Cluster Distances using δ Sct Stars; Oscillating Blue Stragglers in ω Cen

Published online by Cambridge University Press:  03 August 2017

L.M. Freyhammer  and
Jørgen Otzen Petersen
L.M. Freyhammer
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium and University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
Jørgen Otzen Petersen
Affiliation:
Niels Bohr Institute for Astronomy, Physics and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark

Abstract

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The complicated star formation history of the most massive globular cluster in our Galaxy — ω Centauri — is seen as a presence of an asymmetric spatial distribution of two stellar populations having different ages and metallicities. The cluster hosts the largest known sample of Population II δ Sct variables, or SX Phœnicis stars, which are valuable Galactic and extragalactic distance estimators. We discuss the applicability of these variables for estimating distances to the cluster, and compare different techniques for the critical identifications of oscillation modes.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 138 - 139
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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