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The Oosterhoff types of the Fornax dSph Globular Clusters

Published online by Cambridge University Press:  01 December 2006

C. Greco ,
G. Clementini ,
M. Catelan ,
E. Poretti ,
E. V. Held ,
M. Gullieuszik ,
M. Maio ,
A. Rest ,
N. De Lee  and
H. A. Smith
...Show all authors
C. Greco
Affiliation:
INAF-O.A.Bologna, Via Ranzani, 1, 40127, Bologna, Italy email: claudia.greco@oabo.inaf.it Astronomy Department, Bologna University, Via Ranzani, 1, 40127, Bologna, Italy
G. Clementini
Affiliation:
INAF-O.A.Bologna, Via Ranzani, 1, 40127, Bologna, Italy email: claudia.greco@oabo.inaf.it
M. Catelan
Affiliation:
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
E. Poretti
Affiliation:
INAF-O.A.Brera, Via E. Bianchi 46, 23807 Merate, Italy
E. V. Held
Affiliation:
INAF-O.A.Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
M. Gullieuszik
Affiliation:
Astronomy Department, Padua University, vicolo dell'Osservatorio 2, 351222, Padova, Italy
M. Maio
Affiliation:
INAF-O.A.Bologna, Via Ranzani, 1, 40127, Bologna, Italy email: claudia.greco@oabo.inaf.it
A. Rest
Affiliation:
Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
N. De Lee
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA
H. A. Smith
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA
B. J. Pritzl
Affiliation:
Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105, USA
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Abstract

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We have applied the Image Subtraction to B,V time-series photometry of four globular clusters of the Fornax dwarf spheoridal galaxy, which were observed with the 2.2m ESO-MPI, the 6.5m Magellan/Clay, the 4m CTIO/Blanco telescopes and the WFPC2 on board of HST. We have identified RR Lyrae stars and obtained well sampled light curves for the clusters' variables. From the periods and pulsation properties of their RR Lyrae stars Fornax globular clusters seem to be of Oosterhoff intermediate type.

Keywords

Galaxies: dwarf -galaxies: individual(Fornax)-stars: variable -technique: photometry -technique: Image Subtraction

References

Alard, C. 2000, A&AS 144, 363Google Scholar
Greco, C., Clementini, G., Catelan, M. et al. 2007, ApJ submittedGoogle Scholar
Mackey, A.D. & Gilmore, G.F. 2003, MNRAS 345, 747CrossRefGoogle Scholar
Oosterhoff, P.Th. 1939, Observatory 62, 104Google Scholar
Stetson, P.B. 1994, PASP 106, 250CrossRefGoogle Scholar