Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.318.1206c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 4, pp. 1206-1216.
Astronomy and Astrophysics
Astronomy
5
Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function, Astrometry/Subdwarfs, Galaxy: Structure
Scientific paper
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=2h 53m, 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 0.1arcsecyr-1. This paper discusses the completeness of the resulting sample and presents spectroscopy of 30 stars with μ>0.2arcsecyr-1. Based on the latter observations and the distribution in the [HV, (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.
Cooke John A.
Reid Iain Neill
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