Transformations between the WISE, 2MASS, SDSS and BVRI photometric systems - I. Transformation equations for dwarfs

Bilir, S.; Karaali, S.; Ak, S.; daǧtekin, N. D.; Önal, Ö.; Yaz, E.; Coşkunoǧlu, B.; Cabrera-Lavers, A.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 417, Issue 3, pp. 2230-2238.

Fecha de publicación:
11
2011
Número de autores
8
Número de autores del IAC
1
Número de citas
15
Número de citas referidas
14
Descripción
We present colour transformations for the conversion of the W1 and W2 magnitudes of the Wide-field Infrared Survey Explorer (WISE) photometric system to the Johnson-Cousins BVRI, Sloan Digital Sky Survey gri and Two-Micron All-Sky Survey JHKs photometric systems, for dwarfs. The W3 and W4 magnitudes were not considered due to their insufficient signal-to-noise ratio (S/N). The coordinates of 825 dwarfs along with their BVRI, gri and JHKs data taken from Bilir et al. were matched with the coordinates of stars in the preliminary data release of the WISE, and a homogeneous dwarf sample with high S/N had been obtained using the following constraints: (1) the data were dereddened; (2) giants were identified and excluded from the sample; (3) sample stars were selected according to data quality; (4) transformations were derived for subsamples of different metallicity ranges; and (5) transformations were two-colour-dependent. These colour transformations, coupled with known absolute magnitudes at shorter wavelengths, can be used in space-density evaluation for the Galactic (thin and thick) discs, at distances larger than the ones evaluated with JHKs photometry.
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