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Metallicity distribution of ω Cen Red Giants based on the Strömgren m1 metallicity index

Published online by Cambridge University Press:  01 December 2006

A. Calamida ,
G. Bono ,
L. M. Freyhammer ,
F. Grundahl ,
C. E. Corsi ,
P. B. Stetson ,
R. Buonanno ,
M. Hilker  and
T. Richtler
A. Calamida
Affiliation:
INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00040, Monte Porzio Catone, Italy email: [email protected] Universita' di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
G. Bono
Affiliation:
INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00040, Monte Porzio Catone, Italy email: [email protected]
L. M. Freyhammer
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK
F. Grundahl
Affiliation:
Institute of Physics and Astronomy, Aarhus University, Ny Munkegade, 8000 Aarhus C, Denmark
C. E. Corsi
Affiliation:
INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00040, Monte Porzio Catone, Italy email: [email protected]
P. B. Stetson
Affiliation:
DAO, HIA-NRC, 5071 W. Saanich Road, Victoria, BC V9E 2E7, Canada
R. Buonanno
Affiliation:
Universita' di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
M. Hilker
Affiliation:
ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
T. Richtler
Affiliation:
Universidad de Concepcion, Departamento de Fisica, Casilla 106-C, Concepcion, Chile
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Abstract

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We adopted uvby Strömgren photometry to investigate the metallicity distribution of ω Cen Red Giant (RG) stars. We provided a new empirical calibration of the Strömgren m1≡(v − b) − (b − y) metallicity index based on cluster stars. The new calibration has been applied to a sample of ω Cen RGs. The shape of the estimated metallicity distribution is clearly asymmetric, with a sharp cut-off at low metallicities ([Fe/H] < −2.0) and a metal-rich tail up to [Fe/H] ∼ 0.0. Two main metallicity peaks have been identified, around [Fe/H]≈ −1.9 and −1.3 dex, and a metal-rich shoulder at ≈ −0.2 dex.

Keywords

globular clusters: general — globular clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 223 - 226
Copyright
Copyright © International Astronomical Union 2007

References

Anthony-Twarog, B.J., & Twarog, B.A. 1998, AJ, 116, 1922Google Scholar
Anthony-Twarog, B.J., & Twarog, B.A. 2000, AJ, 120, 3111 (ATT)CrossRefGoogle Scholar
Calamida, et al. , 2005, AJ, 634, L69Google Scholar
Cardelli, J.A. et al. , 1989, ApJ, 345, 245CrossRefGoogle Scholar
Cousins, A.W.J. 1976, MNSSA, 35, 70Google Scholar
Crawford, D.L. 1975, AJ, 80, 955Google Scholar
Faria, D. et al. , 2006, A&A, accepted, astro-ph/0611883Google Scholar
Feltzing, A. S., & Gilmore, A. G. 2000, A&A, 355, 949Google Scholar
Gratton, R., Sneden, C. & Carretta, E. 2004, ARA&A, 42, 385Google Scholar
Grundahl, F. et al. , 1999, ApJ, 524, 242CrossRefGoogle Scholar
Grundahl, F., Stetson, P.B., & Andersen, M.I. 2002, A&A, 395, 481Google Scholar
Haywood, M. 2001, MNRAS, 325, 1365Google Scholar
Harris, W.E. 2003, http://physun.physics.mcmaster.ca/harris/mwgc.datGoogle Scholar
Hilker, M. 2000, A&A, 355, 994 (H00)Google Scholar
Kayser, A., Hilker, M., Richtler, T., & Willemsen, P.G. 2006, A&A, 458, 777Google Scholar
Nissen, P.E. 1988, A&A, 199, 146Google Scholar
Nissen, P.E. 1994, RMxAA, 29, 129Google Scholar
Norris, J.E., & DaCosta, G.S. Costa, G.S. 1995, ApJ, 447, 680Google Scholar
Norris, J.E., Freeman, K.C., & Mighell, K.J. 1996, ApJ, 462, 241Google Scholar
Olsen, E.H. 1988, A&A, 189, 173Google Scholar
Rakos, K., & Schombert, J. 2005, PASP, 117, 245Google Scholar
Richtler, T. 1989, A&A, 211, 199Google Scholar
Rutledge, et al. , 1997, PASP, 109, 907Google Scholar
Schlegel, D.J., Finkbeiner, D.P., & Davis, M. 1998, ApJ, 500, 525CrossRefGoogle Scholar
Schuster, W.J., & Nissen, P.E. 1988, A&AS, 221, 65 (SN88)Google Scholar
Schuster, W.J., & Nissen, P.E. 1989, A&AS, 73, 225Google Scholar
Skrutskie, M.F. et al. , 2006, AJ, 131, 1163, http://www.ipac.caltech.edu/2mass/releasesGoogle Scholar
Stanford, L.M., DaCosta, G.S. Costa, G.S., Norris, J.E., & Cannon, R.D. 2004, MemSAIt, 75, 290Google Scholar
Stetson, P.B. 1991, AJ, 102, 589CrossRefGoogle Scholar
Stroemgren, B. 1966, Ann.Rev. A&A, 4, 433Google Scholar
Zinn, R., & West, M.J. 1984, ApJS, 55, 45CrossRefGoogle Scholar