Proper motions with Subaru I. Methods and a first sample in the Subaru Deep Field

Details Proper motions with Subaru I. Methods and a first sample in the Subaru Deep Field Proper motions with Subaru I. Methods and a first sample in the Subaru Deep Field

2008-09-16

arxiv.org/abs/0809.2692v1

Astronomy and Astrophysics

Astrophysics

12 pages, 8 figures, submitted to PASJ

Scientific paper

We search for stars with proper motions in a set of twenty deep Subaru images, covering about 0.28 square degrees to a depth of i ~ 25, taken over a span of six years. In this paper, we describe in detail our reduction and techniques to identify moving objects. We present a first sample of 99 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 9 of the candidates may be white dwarfs. We also find a group of stars which may be extremely metal-poor subdwarfs in the halo.

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