A search for companions to nearby southern M dwarfs with near-infrared speckle interferometry

Ch Leinert, T. Henry, A. Glindemann, D. W. McCarthy

Research output: Contribution to journalArticle

58 Scopus citations

Abstract

We searched the 9 M-dwarf primaries nearer than 5 pc and south of declination δ = -30° for companions with separations 1-10 AU and found none. Taken together with the 25 northern primaries studied by Henry and McCarthy (1990) the fraction of binaries and triples within the now complete sample of all M dwarfs within 5 pc is 9/34 = 26 ± 9%, and the average number of companions per system is 0.32 ± 0.10. This is lower by 2σ than the observed multiplicity fraction of 43 ± 5%, and companions per system of 0.49 ± 0.05 in the sample of nearby solar-type main sequence stars. It is also much lower than the extrapolated binary fraction among young stars in Taurus. We discuss the implications of this finding.

Original languageEnglish (US)
Pages (from-to)159-166
Number of pages8
JournalAstronomy and astrophysics
Volume325
Issue number1
StatePublished - Sep 1 1997

Keywords

  • Binaries: general
  • Stars: low-mass
  • Stars: luminosity function, mass function

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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