2004/03/09 by D. Pourbaix, Z. Ivezic, Željko Ivezić +4 · 2 citations
Mathematics · Physics and Astronomy · #Asteroseismology #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Binary number #Binary star #Galaxies: Formation, Evolution, Phenomena #Main sequence #Mathematics #Physics #Sky #Stars #Stellar classification #Stellar, planetary, and galactic studies #White dwarf #astro-ph
paper · pdf · doi:10.1051/0004-6361:20040346
published as Astron.Astrophys. 423 (2004) 755-760 · submitted to A&A, 13 pages, 6 figures
arxiv created 2004/03/09 · openalex publication_date 2004/07/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 [CITE] for discovering unresolved binary stars. Using the Sloan Digital Sky Survey (SDSS) Data Release 2 with ~ stars brighter than 21m in the u and g bands, we select 346 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 [CITE], 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.