Proper motions with Subaru II. A sample in the Subaru/XMM-Newton Deep Survey field

摘要

We search for stars with proper motions in a set of deep Subaru images,covering about 0.48 square degrees to a depth of $i' \simeq 26$, taken over aspan of five and a half years. We follow the methods described in\citet{Richmond2009} to reduce and analyze this dataset. We present a sample of69 stars with motions of high significance, and discuss briefly the populationsfrom which they are likely drawn. Based on photometry and motions alone, weexpect that 14 of the candidates may be white dwarfs. Our candidate with thelargest proper motion is surprisingly faint and likely to prove interesting:its colors and motions suggest that it might be an M dwarf moving at over 500km/sec or an L dwarf in the halo.