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RR Lyrae Variables in Local Group Galaxies: M311

Published online by Cambridge University Press:  12 April 2016

G. Clementini ,
L. Federici ,
C. Cacciari ,
M. Bellazzini ,
C. Corsi  and
H.A. Smith
G. Clementini
Affiliation:
Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy, e-mail:gisella@bo astro.it
L. Federici
Affiliation:
Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy, e-mail:gisella@bo astro.it
C. Cacciari
Affiliation:
Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy, e-mail:gisella@bo astro.it
M. Bellazzini
Affiliation:
Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy, e-mail:gisella@bo astro.it
C. Corsi
Affiliation:
Osservatorio Astronomico di Roma, Via di Frascati 33, I-00040 Monte Porzio Catone, Italy
H.A. Smith
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1116

Abstract

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Candidate RR Lyrae variables have been identified for the first time in four globular clusters of the Andromeda galaxy (M31). Using HST-WFPC2 archive observations we have found 2, 4, 11 and 8 RR Lyrae variables of both ab and c Bailey types in G11, G33, G64 and G322 (Sargent et al., 1977), respectively. These numbers are quite consistent with the horizontal branch morphology exhibited by the four clusters.

Type
Part 1.3. Stellar Pulsation and the Distance Scale
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 128 - 129
Copyright
Copyright © Astronomical Society of the Pacific 2002

Footnotes

1

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555.

References

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