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2000AJ....120.2550M - Astron. J., 120, 2550-2568 (2000/November-0)
Exploring halo substructure with giant stars. I. Survey description and calibration of the photometric search technique.
MAJEWSKI S.R., OSTHEIMER J.C., KUNKEL W.E. and PATTERSON R.J.
Abstract (from CDS):
To calibrate our (M-T2, M-DDO51) diagram as a means to discriminate field giant stars from nearby dwarfs, we utilize new photometry of the main sequences of the open clusters NGC 3680 and NGC 2477 and the red giant branches of the clusters NGC 3680, Melotte 66, and ω Centauri, supplemented with data on field stars, globular clusters and open clusters by Doug Geisler and collaborators. By combining the data on stars from different clusters, and by taking advantage of the wide abundance spread within ω Centauri, we verify the primary dependence of the M-DDO51 color on luminosity and demonstrate the secondary sensitivity to metallicity among giant stars. Our empirical results are found to be generally consistent with those from analysis of synthetic spectra by Paltoglou & Bell.
Finally, we provide conversion formulae from the (M, M-T2) system to the (V, V-I) system, corresponding reddening laws, as well as empirical red giant branch curves from ω Centauri stars for use in deriving photometric parallaxes for giant stars of various metallicities (but equivalent ages) to those of ω Centauri giants.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Evolution - Galaxy: Formation - Galaxy: Halo - Galaxy: Structure
Simbad objects: 33
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