Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-27
Mon.Not.Roy.Astron.Soc.384:1178-1188,2008
Astronomy and Astrophysics
Astrophysics
11 pages, including 10 figures and 7 tables, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2007.12783.x
We present colour transformations for the conversion of the {\em 2MASS} photometric system to the Johnson-Cousins $UBVRI$ system and further into the {\em SDSS} $ugriz$ system. We have taken {\em SDSS} $gri$ magnitudes of stars measured with the 2.5-m telescope from $SDSS$ Data Release 5 (DR5), and $BVRI$ and $JHK_{s}$ magnitudes from Stetson's catalogue and \citet{Cu03}, respectively. We matched thousands of stars in the three photometric systems by their coordinates and obtained a homogeneous sample of 825 stars by the following constraints, which are not used in previous transformations: 1) the data are de-reddened, 2) giants are omitted, and 3) the sample stars selected are of the highest quality. We give metallicity, population type, and transformations dependent on two colours. The transformations provide absolute magnitude and distance determinations which can be used in space density evaluations at short distances where some or all of the {\em SDSS} $ugriz$ magnitudes are saturated. The combination of these densities with those evaluated at larger distances using {\em SDSS} $ugriz$ photometry will supply accurate Galactic model parameters, particularly the local space densities for each population.
Ak S.
Bilir Selcuk
Cabrera-Lavers Antonio
Chonis Taylor S.
Gaskell Martin C.
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