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Title:
CCD astrometry of southern very low-mass stars
Authors:
Tinney, C. G.
Affiliation:
AA(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 2, pp. 644-658. (MNRAS Homepage)
Publication Date:
07/1996
Origin:
MNRAS
Astronomy Keywords:
ASTROMETRY, STARS: DISTANCES, STARS: INDIVIDUAL: VB 10, STARS: LOW-MASS, BROWN DWARFS
Bibliographic Code:
1996MNRAS.281..644T

Abstract

CCD astronomy of a sample of southern very low-mass (VLM) stars, obtained on the 2.2-m telescope at the European Southern Observatory, La Silla, is presented. Trigonometric parallaxes have been determined for 13 stars, and proper motions for a further two stars. Photometry in the I and K passbands is also presented for the astrometric programme stars, and is used to construct an M_K:I-K colour-magnitude diagram. Astrometric observations have been made of the canonical very late M dwarf VB 10 through a narrow-band (Deltalambda=90 A) filter. These data confirm that the effects of differential colour refraction can be substantially reduced by the use of such filters, without compromising astrometric precision.

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