Color-Induced Displacement double stars in SDSS

Details Color-Induced Displacement double stars in SDSS Color-Induced Displacement double stars in SDSS

2004-03-09

arxiv.org/abs/astro-ph/0403219v1

Astron.Astrophys. 423 (2004) 755-760

Astronomy and Astrophysics

Astrophysics

submitted to A&A, 13 pages, 6 figures

Scientific paper

10.1051/0004-6361:20040346

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.

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