Color-Induced Displacement double stars in SDSS

Abstract

We report the first successful application of the astrometric color-induced displacement technique (CID, the displacement of the photocenter between different bandpasses due to a varying contribution of differently colored components to the total light), originally proposed by Wielen (1996) for discovering unresolved binary stars. Using the Sloan Digital Sky Survey (SDSS) Data Release 1 with 2.5 million stars brighter than 21m in the u and g bands, we select 419 candidate binary stars with CID greater than 0.5 arcsec. The SDSS colors of the majority of these candidates are consistent with binary systems including a white dwarf and any main sequence star with spectral type later than ~K7. The astrometric CID method discussed here is complementary to the photometric selection of binary stars in SDSS discussed by Smolcic et al. (2004), but there is considerable overlap (15%) between the two samples of selected candidates. This overlap testifies both to the physical soundness of both methods, as well as to the astrometric and photometric quality of SDSS data.

submitted to A&A, 13 pages, 6 figures

References in corpus (12)

• The Sloan Digital Sky Survey: Technical Summary
• The Sloan Digital Sky Survey Photometric Camera
• The u'g'r'i'z' Standard Star Network
• Astrometric Calibration of the Sloan Digital Sky Survey
• A photometricity and extinction monitor at the Apache Point Observatory
• Colors of 2625 Quasars at 0<z<5 Measured in the Sloan Digital Sky Survey Photometric System
• Color Confirmation of Asteroid Families
• Comparison of Asteroids Observed in the SDSS with a Catalog of Known Asteroids
• Optical and Infrared Colors of Stars Observed by 2MASS and SDSS
• An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
• How many Hipparcos Variability-Induced Movers are genuine binaries?
• Variability Studies with SDSS

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• Data-driven spectroscopic estimates of absolute magnitude, distance and binarity -- method and catalog of 16,002 O- and B-type stars from LAMOST
• Candidate spectroscopic binaries in the Sloan Digital Sky Survey
• Digital color codes of stars
• Application of USNO-B1.0 towards selecting objects with displaced blue and red components
• Robust detection of CID double stars in SDSS