Open AccessHigh proper motion stars in Kapteyn Selected Area 94
Author(s) -
Cooke J. A.,
Neill Reid I.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03806.x
Subject(s) - physics , stars , astronomy , astrophysics , proper motion , motion (physics) , classical mechanics
We have applied the astrometric techniques devised by Murray for analysis of 48‐inch Schmidt photographic data to SuperCOSMOS scans of UK Schmidt plates centred on Kapteyn's Selected Area 94 ( α =2 h 53 m , δ =0°). In this preliminary study, we combine astrometric data from four short‐exposure V ‐band plates, taken in 1987 August (2 plates) and 1993 August (2 plates), with BVRI photometry from sky‐limited plate material, to identify stars with proper motions exceeding 0.1 arcsec yr −1 . This paper discusses the completeness of the resulting sample and presents spectroscopy of 30 stars with μ >0.2 arcsec yr −1 . Based on the latter observations and the distribution in the [H V , ( V − I )] reduced proper‐motion diagram, we have classified stars in the complete sample as candidate white dwarfs, main‐sequence dwarfs and halo subdwarfs, and derived estimates of the disc and halo luminosity functions.