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

TL;DR

This study identifies 69 stars with significant proper motions in deep Subaru images over 0.48 square degrees, revealing potential white dwarfs and high-velocity halo objects, advancing understanding of stellar populations.

Contribution

It presents a new sample of high proper motion stars from Subaru data, including candidates for white dwarfs and halo M or L dwarfs, using a five-and-a-half-year observational baseline.

Findings

69 stars with significant proper motions identified

14 candidates likely to be white dwarfs

One faint high-velocity candidate possibly an halo M or L dwarf

Abstract

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 a span of five and a half years. We follow the methods described in \citet{Richmond2009} to reduce and analyze this dataset. We present a sample of 69 stars with motions of high significance, and discuss briefly the populations from which they are likely drawn. Based on photometry and motions alone, we expect that 14 of the candidates may be white dwarfs. Our candidate with the largest 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 500 km/sec or an L dwarf in the halo.