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Parallaxes Using Infrared Arrays

Published online by Cambridge University Press:  14 August 2015

R.M. Brockie ,
H.R.A. Jones ,
M. Wells  and
A.J. Longmore
R.M. Brockie
Affiliation:
Institute of Astronomy, University of Edinburgh
H.R.A. Jones
Affiliation:
Institute of Astronomy, University of Tokyo Astrophysics Group, Liverpool JM University
M. Wells
Affiliation:
Royal Observatory Edinburgh
A.J. Longmore
Affiliation:
Royal Observatory Edinburgh

Abstract

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We have recently carried out an infrared parallax programme on the UKIRT conducted with a 2562 array. Our observations were made in the near-infrared K-band which is ideal for observing red stars and brown dwarf candidates and has the advantage that differential colour refraction is negligible. We find a parallax of πabs = 156.0 ±13.3 mas for the archetypal late-type M dwarf vB 10 and πabs =11.1 ± 7.5 mas for PC 0025+0447 which we conclude is too distant to be a clear case of a brown dwarf and is probably a late-type M dwarf close to the hydrogen-burning limit. Recent improvements in telescopes and instrumentation working in the infrared should enable accuracies of ~ 1 mas to be obtained for future infrared parallax programmes.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 438
Copyright
Copyright © Kluwer 1998