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

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

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..159l&link_type=abstract

Astronomy and Astrophysics, v.325, p.159-166

Astronomy and Astrophysics

Astrophysics

50

Binaries: General, Stars: Low-Mass, Stars: Luminosity Function, Mass Function

Scientific paper

We searched the 9 M-dwarf primaries nearer than 5pc and south of declination δ=-30^o^ for companions with separations 1-10AU and found none. Taken together with the 25 northern primaries studied by Henry and McCarthy (1990ApJ...350..334H) the fraction of binaries and triples within the now complete sample of all M dwarfs within 5pc 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.

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