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J/A+A/423/755  Color-Induced Displacement double stars in SDSS (Pourbaix+, 2004)

Color-Induced Displacement double stars in SDSS. Pourbaix D., Ivezic Z., Knapp G.R., Gunn J.E., Lupton R.H. <Astron. Astrophys. 423, 755 (2004)> =2004A&A...423..755P
ADC_Keywords: Surveys ; Stars, double and multiple ; Photometry, SDSS Keywords: astrometry - stars: binaries: general Abstract: We report the first successful application of the astrometric color-induced displacement technique (CID, the displacement of the photocenter between different band-passes dur to a varying contribution of differently colored components to the total light), originally proposed by Wielen (1996A&A...314..679W) for discovering unresolved binary stars. Description: Table 1 contains the 346 objects from the SDSS data release 2 (http://www.sdss.org/dr2) that exhibit a displacement of the photocenter between that measured in the u and z bands. Such a displacement is attributed to the binary nature of the object. Besides the equatorial positions, the table contains the magnitudes and uncertainties measured in the five photometric filters (u,g,r,i,z) and the respective offsets in right ascension and declinations. By construction, the offsets in the r bands are null and were therefore omitted. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 213 346 Objects from SDSS Data Release 2 that exhibit a displacement of the photocenter between that measured in the u and z bands.
See also: http://www.sdss.org/dr2 : SDSS Data Release 2 Home Page J/AJ/126/2579 : SDSS quasar catalog. II. First data release (Schneider+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 F16.12 deg RAdeg Right ascension (in decimal degree) (J2000) 18- 33 F16.12 deg DEdeg Declination (in decimal degree) (J2000) 35- 42 F8.5 mag umag u magnitude 44- 51 F8.5 mag gmag g magnitude 53- 60 F8.5 mag rmag r magnitude 62- 69 F8.5 mag imag i magnitude 71- 78 F8.5 mag zmag z magnitude 80- 89 F10.8 mag e_umag Uncertainty on the u magnitude 91-100 F10.8 mag e_gmag Uncertainty on the g magnitude 102-111 F10.8 mag e_rmag Uncertainty on the r magnitude 113-122 F10.8 mag e_imag Uncertainty on the i magnitude 124-133 F10.8 mag e_zmag Uncertainty on the z magnitude 135-143 F9.6 arcsec oRAu Offset in right ascension in the u band 145-153 F9.6 arcsec oRAg Offset in right ascension in the g band 155-163 F9.6 arcsec oRAi Offset in right ascension in the i band 165-173 F9.6 arcsec oRAz Offset in right ascension in the z band 175-183 F9.6 arcsec oDEu Offset in declination in the u band 185-193 F9.6 arcsec oDEg Offset in declination in the g band 195-203 F9.6 arcsec oDEi Offset in declination in the i band 205-213 F9.6 arcsec oDEz Offset in declination in the z band
Acknowledgements: Dimitri Pourbaix
(End) Patricia Vannier [CDS] 18-May-2004
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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