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J/AJ/134/2398       Stellar SEDs in SDSS and 2MASS filters   (Covey+, 2007)

Stellar SEDs from 0.3 to 2.5 µm: tracing the stellar locus and searching for color outliers in the SDSS and 2MASS. Covey K.R., Ivezic Z., Schlegel D., Finkbeiner D., Padmanabhan N., Lupton R.H., Agueros M.A., Bochanski J.J., Hawley S.L., West A.A., Seth A., Kimball A., Gogarten S.M., Claire M., Haggard D., Kaib N., Schneider D.P., Sesar B. <Astron. J., 134, 2398-2417 (2007)> =2007AJ....134.2398C
ADC_Keywords: Photometry, SDSS ; Photometry, infrared ; Energy distributions Keywords: Galaxy: stellar content - infrared: stars - stars: early-type - stars: late-type - surveys Abstract: The Sloan Digital Sky Survey (SDSS) and Two Micron All Sky Survey (2MASS) are rich resources for studying stellar astrophysics and the structure and formation history of the Galaxy. As new surveys and instruments adopt similar filter sets, it is increasingly important to understand the properties of the ugrizJHKs stellar locus, both to inform studies of "normal" main-sequence stars and enable robust searches for point sources with unusual colors. Using a sample of ∼600000 point sources detected by SDSS and 2MASS, we tabulate the position and width of the ugrizJHKs stellar locus as a function of g-i color, and provide accurate polynomial fits. We map the Morgan-Keenan spectral type sequence to the median stellar locus by using synthetic photometry of spectral standards and by analyzing 3000 SDSS stellar spectra with a custom spectral typing pipeline, described in the Appendix to this paper. We develop an algorithm to calculate a point source's minimum separation from the stellar locus in a seven-dimensional color space, and use it to robustly identify objects with unusual colors, as well as spurious SDSS/2MASS matches. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 201 Locus colors as a function of g-i color table3.dat 57 86 Synthetic SDSS/2MASS photometry of Pickles (1998, Cat. J/PASP/110/863) solar metallicity standards
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/PASP/110/863 : A Stellar Spectral Flux Library: 1150-25000A (Pickles 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 F4.2 mag g-i The (g-i) color index 6- 9 I4 --- Nstars Number of stars 11- 14 F4.2 mag u-g The (u-g) color index 16- 19 F4.2 mag e_u-g The 1σ error in u-g 21- 24 F4.2 mag g-r The (g-r) color index 26- 29 F4.2 mag e_g-r The 1σ error in g-r 31- 34 F4.2 mag r-i The (r-i) color index 36- 39 F4.2 mag e_r-i The 1σ error in r-i 41- 45 F5.2 mag i-z The (i-z) color index 47- 50 F4.2 mag e_i-z The 1σ error in i-z 52- 55 F4.2 mag z-J The (z-J) color index 57- 60 F4.2 mag e_z-J The 1σ error in z-J 62- 65 F4.2 mag J-H The (J-H) color index 67- 70 F4.2 mag e_J-H The 1σ error in J-H 72- 75 F4.2 mag H-Ks The (H-Ks) color index 77- 80 F4.2 mag e_H-Ks The 1σ error in H-Ks
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- SpType MK spectral type 6- 8 A3 --- LClass Luminosity class 10- 14 F5.2 mag u-g The (u-g) color index 16- 20 F5.2 mag g-r The (g-r) color index 22- 26 F5.2 mag r-i The (r-i) color index 28- 32 F5.2 mag i-z The (i-z) color index 34- 38 F5.2 mag z-J The (z-J) color index 40- 44 F5.2 mag J-H The (J-H) color index 46- 50 F5.2 mag H-Ks The (H-Ks) color index 52- 57 F6.2 mag JMAG Absolute J band magnitude
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 13-Feb-2010
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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