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arXiv:0706.1346 (astro-ph)
[Submitted on 10 Jun 2007]

Title:Southern wide very low-mass stars and brown dwarfs in resolved binary and multiple systems

Authors:José Antonio Caballero
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Abstract: The results of the Koenigstuhl survey in the Southern Hemisphere are presented. I have searched for common-proper motion companions to 173 field very low-mass stars and brown dwarfs with spectral types > M5.0V and magnitudes J <= 14.5 mag. I have measured for the first time the common-proper motion of two new wide systems containing very low-mass components, Koenigstuhl 2 AB and 3 A-BC. Together with Koenigstuhl 1 AB and 2M0126-50AB, they are among the widest systems in their respective classes (r = 450-11900 AU). Koenigstuhl 3 A-BC contains a well-known F8V star and a M8.0+L3.0V tight binary. I have determined the minimum frequency of field wide multiples (r > 100 AU) with late-type components at 5.0+/-1.8 % and the frequency of field wide late-type binaries with mass ratios q > 0.5 at 1.2+/-0.9 %. These values represent a key diagnostic of evolution history and low-mass star and brown-dwarf formation scenarios. Additionally, the proper motions of 76 field very low-mass dwarfs are measured here for the first time.
Comments: ApJ, in press
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.1346 [astro-ph]
  (or arXiv:0706.1346v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1346
Related DOI: https://doi.org/10.1086/520873

Submission history

From: José A. Caballero [view email]
[v1] Sun, 10 Jun 2007 10:42:38 UTC (67 KB)
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