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

被引：0
|
作者：
Leinert, C
Henry, T
Glindemann, A
McCarthy, DW
机构：
[1] SPACE TELESCOPE SCI INST, BALTIMORE, MD 21218 USA
[2] UNIV ARIZONA, STEWARD OBSERV, TUCSON, AZ 85721 USA
来源：
ASTRONOMY & ASTROPHYSICS | 1997年 / 325卷 / 01期
关键词：
binaries: general; stars: low-mass; stars: luminosity function; mass function;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We searched the 9 M-dwarf primaries nearer than 5 pc and south of declination delta = -30 degrees 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 2 sigma 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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页码：159 / 166
页数：8
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