Red Variables in Globular Clusters: Comparison with the Bulge and the LMC

Details Red Variables in Globular Clusters: Comparison with the Bulge and the LMC Red Variables in Globular Clusters: Comparison with the Bulge and the LMC

2005-09-23

arxiv.org/abs/astro-ph/0509714v1

Mem.Soc.Ast.It.77:63-66,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figures, to appear in the proceedings of the Workshop "Stellar pulsation and evolution", 2005. Monte Porzio Catone,

Scientific paper

We are conducting a project aimed at surveys and repeated observations of red variables (or long-period variables) in globular clusters. Using the IRSF/SIRIUS near-infrared facility located at South Africa, we are observing 145 globular clusters that are accessible from the site. In this contribution, we present our observations and preliminary results. We have discovered many red variables, especially in the Bulge region, whose memberships to the clusters remain to be confirmed. Using a sample of all red variables (both already known and newly discovered ones) in globular clusters except those projected to the Bulge region, we produce a log P-K diagram and compare it with those for the Bulge and the Large Magellanic Cloud. A prominent feature is that the bright part of overtone-pulsators' sequence (B+ and C') is absent.

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