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A CCD Optical Search for Visual Very Low–Mass Companions of Halo Stars

Published online by Cambridge University Press:  12 April 2016

Eduardo L. Martin  and
Rafael Rebolo
Eduardo L. Martin
Affiliation:
Instituto de Astrofísica de Canarias, E-38200, La Laguna, Spain
Rafael Rebolo
Affiliation:
Instituto de Astrofísica de Canarias, E-38200, La Laguna, Spain

Abstract

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We have begun a search for faint companions to cataloged G/K metal–deficient dwarfs. The main goals of this investigation are:

  1. i) to collect a database of halo M-type stars

  2. ii) to study the frecuency of binary separations in the range 1″ - 50″ for Population II stars

  3. iii) to find some metal-poor very–cool dwarfs that may serve as references to investigate the low-mass end of the halo main sequence.

In this paper we present the first results from VRI CCD photometry of a subset (51 stars) of our sample. We have identified 7 possible very low mass companions (angular separations 1″.5 – 30″) of halo subdwarfs with [Fe/H] in the range from −0.8 to −2.6.

Type
Classical Methods, Catalogs, & Databases
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 336 - 338
Copyright
Copyright © Astronomical Society of the Pacific 1992

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