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J/MNRAS/440/3430    SDSS-2MASS-WISE stellar colour locus     (Davenport+, 2014)

The SDSS-2MASS-WISE 10-dimensional stellar colour locus. Davenport J.R.A., Ivezic Z., Becker A.C., Ruan J.J., Hunt-Walker N.M., Covey K.R., Lewis A.R., Alsayyad Y., Anderson L.M. <Mon. Not. R. Astron. Soc., 440, 3430-3438 (2014)> =2014MNRAS.440.3430D (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Photometry, SDSS ; Photometry, infrared ; Colors Keywords: surveys - stars: fundamental parameters - stars: general - dust, extinction Abstract: We present the fiducial main-sequence stellar locus traced by 10 photometric colours observed by Sloan Digital Sky Survey (SDSS), Two Micron All Sky Survey (2MASS), and Wide-field Infrared Survey Explorer (WISE). Median colours are determined using 1052 793 stars with r-band extinction less than 0.125. We use this locus to measure the dust extinction curve relative to the r band, which is consistent with previous measurements in the SDSS and 2MASS bands. The WISE band extinction coefficients are larger than predicted by standard extinction models. Using 13 lines of sight, we find variations in the extinction curve in H, Ks, and WISE bandpasses. Relative extinction decreases towards Galactic anticentre, in agreement with prior studies. Relative extinction increases with Galactic latitude, in contrast to previous observations. This indicates a universal mid-IR extinction law does not exist due to variations in dust grain size and chemistry with Galactocentric position. A preliminary search for outliers due to warm circumstellar dust is also presented, using stars with high signal-to-noise ratio in the W3 band. We find 199 such outliers, identified by excess emission in Ks-W3. Inspection of SDSS images for these outliers reveals a large number of contaminants due to nearby galaxies. Six sources appear to be genuine dust candidates, yielding a fraction of systems with infrared excess of 0.12±0.05 per cent. Description: Our data come from three surveys that differ greatly in their sky coverage, photometric depth, and wavelength coverage. The optical photometry for our study came from the SDSS Data Release 8 (DR8; Aihara et al. 2011ApJS..193...29A). The mid-infrared photometry we used came from the latest AllWISE data release (Cutir et al., 2013, Cat. II/328). Astrometric calibration for WISE was achieved by matching sources to the full-sky 2MASS point source catalog (Wright et al. 2010AJ....140.1868W). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 97 135 Optical and NIR colour locus as a function of g-i colour bins table2.dat 71 135 The mid-IR colour locus as a function of g-i colour
See also: II/328 : AllWISE Data Release (Cutri+ 2013) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
2- 5 F4.2 mag g-i g-i colour index 9- 13 I5 --- Nstar Number of stars in each bin 15- 19 F5.3 mag u-g u-g colour index 21- 25 F5.3 mag e_u-g rms uncertainty on u-g 27- 31 F5.3 mag g-r g-r colour index 33- 37 F5.3 mag e_g-r rms uncertainty on g-r 39- 43 F5.3 mag r-i r-i colour index 45- 49 F5.3 mag e_r-i rms uncertainty on r-i 50- 55 F6.3 mag i-z i-z colour index 57- 61 F5.3 mag e_i-z rms uncertainty on i-z 63- 67 F5.3 mag z-J z-J colour index 69- 73 F5.3 mag e_z-J rms uncertainty on z-J 75- 79 F5.3 mag J-H J-H colour index 81- 85 F5.3 mag e_J-H rms uncertainty on J-H 87- 91 F5.3 mag H-Ks H-Ks colour index 93- 97 F5.3 mag e_H-Ks rms uncertainty on H-Ks
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
4- 7 F4.2 mag g-i g-i colour index 10- 14 I5 --- Nstars Number of stars in each bin from the primary sample 18- 22 F5.3 mag Ks-W1 Ks-W1 colour index 26- 30 F5.3 mag e_Ks-W1 rms uncertainty on Ks-W1 33- 38 F6.3 mag W1-W2 W1-W2 colour index 42- 46 F5.3 mag e_W1-W2 rms uncertainty on W1-W2 50- 52 I3 --- NStarsW3 Number of stars in each bin from the W3-limited subsample 55- 61 F7.3 mag W2-W3 ?=-99 W2-W3 colour index 67- 71 F5.3 mag e_W2-W3 ?=0 rms uncertainty on W2-W3
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 22-May-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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