Search for Binary Systems from the SDSS

Details Search for Binary Systems from the SDSS Search for Binary Systems from the SDSS

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..266l&link_type=abstract

Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he

Astronomy and Astrophysics

Astrophysics

Scientific paper

Some of cool stars exhibiting a strong Hα emission line in their spectra are actually binary systems with an undiscovered component such as RS CVn types, AM Hers, symbiotic systems and so forth. We therefore have searched candidates of binary systems from the Sloan Digital Sky Survey Fourth Data Release (SDSS DR4) for the spectra showing strong Balmer emission lines in the late-type stars cooler than K spectral type. These categoric stars include such as M, L, and cool C-types having a low effective temperature (< 3,500 K), hence, in general, exhibiting absorption features of Balmer series. Of 23,936 sample classified as the late-type in the SDSS DR4, we selected 312 stars satisfying our constraints on the flux of Hα emission line in the continuum removed spectra, greater than 20 times level compared with continuum removed one. With handful inspection of those spectra, we find four candidates of binary systems, presumably all cataclysmic variables: SDSS J012018.49-102536.1, J133336.22+491157.7, J152831.00+380305.8, and J215101.33+123739.9 including two previously identified ones. In order to confirm these objects as binary systems and to determine their variable types, we are planning to perform the follow-up observations.

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