Fragile Binary Candidates in the SDSS DR8 Spectroscopic Archive

Details Fragile Binary Candidates in the SDSS DR8 Spectroscopic Archive Fragile Binary Candidates in the SDSS DR8 Spectroscopic Archive

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915347o&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.47

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a catalog of 79 very wide fragile binary candidates (projected separations > 104 AU) from the SDSS DR8 spectral archive. The pairs were selected based on proper motion, radial velocity, metallcity and photometric parallax criteria. The angular separations of these pairs range from 3 to 250 arc seconds. The peak in the metallicity distribution of these pairs is about -0.5 dex of the solar metallicity. Space motions and the reduced proper motion diagram indicate all these pairs are members of the disk. The chromospheric activity index SHK of each component and member stars of three open clusters (NGC2420, M67 and NGC6791) were measured. The SHK vs. (g-r)0 color relation for most of these binaries is consistent with the trends seen in these open clusters. The ages implied by this relation suggest that fragile wide pairs can survive longer than 8 Gyr. Support for this project from NSF grant AST-0807919 to Florida Institute of Technology is gratefully acknowledged.

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