M32 RR Lyrae variable stars confirmed (Fiorentino+, 2012)

Details M32 RR Lyrae variable stars confirmed (Fiorentino+, 2012) M32 RR Lyrae variable stars confirmed (Fiorentino+, 2012)

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ycat..35399138f&link_type=abstract

VizieR On-line Data Catalog: J/A+A/539/A138. Originally published in: 2012A&A...539A.138F

Physics

Galaxies: Nearby, Stars: Variable, Photometry: Hst

Scientific paper

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.
(1 data file).

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