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| Paper: |
Cool Stars in Wide Binaries: 23,000 Common Proper Motion Doubles from the SUPERBLINK Proper Motion Survey |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1375 |
| Authors: |
Lépine, S. |
| Abstract: |
The current version of the SUPERBLINK proper motion catalog, now
listing over 2,800,000 stars with proper motions μ > 40 mas/yr, is
searched for common proper motion pairs. Statistical analysis
demonstrates that the catalog already contains more than 18,000
co-moving pairs which are most likely to be wide binaries. Many of
these are relatively nearby (d< 100 pc) low-mass systems with K and M
dwarf components. However, we also identify about 1,200 high-velocity
systems, whose components are mostly old, metal-poor K and M subdwarfs
associated with the Galactic thick disc or halo. We estimate that the
field population has a wide-binary multiplicity fraction of at least
1.3% for low-mass stars (K–M dwarfs), while the local old population
has a multiplicity fraction of at least 0.43% (K–M subdwarfs). |
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