CCD astrometry of southern very low-mass stars

Details CCD astrometry of southern very low-mass stars CCD astrometry of southern very low-mass stars

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..644t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 2, pp. 644-658.

Astronomy and Astrophysics

Astronomy

70

Astrometry, Stars: Distances, Stars: Individual: Vb 10, Stars: Low-Mass, Brown Dwarfs

Scientific paper

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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