RR Lyr variable stars in M32 Virtual Observatory Resource

Authors

1. Fiorentino G.
2. Contreras Ramos R.
3. Tolstoy E.
4. Clementini G.
5. Saha A.

Published by

CDS

Abstract

Using archival multi-epoch ACS/WFC images in the F606W and F814W filters of a resolved stellar field in Local Group dwarf elliptical galaxy M 32 we have made an accurate Colour-Magnitude Diagram and a careful search for RR Lyr variable stars. We identified 416 bona fide RR Lyr stars over our field of view, and their spatial distribution shows a rising number density towards the centre of M 32. These new observations clearly confirm the tentative result of Fiorentino et al. (2010ApJ...708..817F), on a much smaller field of view, associating an ancient population of RR Lyr variables to M 32. We associate at least 83 RR Lyr stars in our field to M 32.

Keywords

1. galaxies
2. variable-stars
3. hst-photometry

Bibliographic source Bibcode

2012A&A...539A.138F

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ivo://CDS.VizieR/J/A+A/539/A138

Document Object Identifer DOI

doi:10.26093/cds/vizier.35390138

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