Fragile Binary Candidates in the SDSS DR8 spectroscopic archive
arXiv:1111.2831 · doi:10.1088/0004-6256/143/2/31
Abstract
We present a catalog of 80 very wide fragile binary candidates (projected separations > 10000 AU) from the SDSS DR8 spectral archive. The pairs were selected based on proper motion, radial velocity, metallicity and photometric parallax criteria. The angular separations of these pairs range from 3" to 250". The peak in the metallicity distribution of these pairs is about -0.5 dex of solar metallicity. Space motions and reduced proper motion diagrams indicate all these pairs are members of the disk. The chromospheric activity index SHK of each component in 38 binary candidates having spectra of high signal-to-noise ratio and member stars of three open clusters (NGC2420, M67 and NGC6791) were measured. The SHK vs. color relation for these binary candidates is consistent with the trend seen in these open clusters. The ages implied by this relation suggest that fragile wide pairs can survive longer than 8 Gyr.
17 pages, 12 figures, accepted by AJ
References in corpus (11)
- The UKIRT Infrared Deep Sky Survey (UKIDSS)
- The 2.5 m Telescope of the Sloan Digital Sky Survey
- The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
- The Milky Way Tomography with SDSS: II. Stellar Metallicity
- The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
- New Distant Companions to Known Nearby Stars. II. Faint companions of Hipparcos stars and the frequency of wide binary systems
- The SEGUE Stellar Parameter Pipeline. IV. Validation with an Extended Sample of Galactic Globular and Open Clusters
- A new standard: Age and distance for the open cluster NGC 6791 from the eclipsing binary member V20
- The Chromospheric Activity, Age, Metallicty and Space Motions of 36 Wide Binaries
- Candidate Disk Wide Binaries in the Sloan Digital Sky Survey
- The stellar correlation function from SDSS - A statistical search for wide binary stars