Assigned ID: 80 ----- Attempting Submission 1 (Wed Feb 24 11:34:33 GMT 2010) ----- HST Phase I Proposal 80 (slepine_AR.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 26 18:02:52 GMT 2010) ----- HST Phase I Proposal 80 (slepine_AR2.apt) successfully submitted. ----- Attempting Submission 3 (Fri Feb 26 20:53:31 GMT 2010) ----- We propose to determine the multiplicity fraction and distribution of orbital separations for populations of nearby disk and halo stars in the separation range from 1 AU to 100,000 AU. We estimate that about 2,900 of the 2,000,000 stars with proper motions >40mas/yr (now listed in the SUPERBLINK proper motions database) have been seredipitously imaged in the course of the HST mission by the various cameras. The sample includes including about 2,200 nearby low-mass disk dwarfs, and 700 low-mass halo subdwarfs. All HST pictures containing these stars will be carefully examined to identify all resolved pairs. The results will be combined with our current survey of very wide binaries in common proper motion pairs, to determine with unprecedented precision the distribution of orbital separations for low-mass stars from both the disk and halo populations. The comparison will provide powerful constraints on the formation environments of disk and halo stars and on their dynamical evolution.

COOL STARS 12 160000 false 0.0 0.0 false false false false false false SUPPORTED