Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0808p&link_type=abstract
American Astronomical Society Meeting 208, #8.08; Bulletin of the American Astronomical Society, Vol. 38, p.87
Other
Scientific paper
The frequency and mass ratio distribution of the closest, low-mass binaries bear directly on models of star, brown dwarf, and planet formation. Furthermore, spectroscopic observations provide mass ratios independent of many of the assumptions needed to convert visual binary magnitude differences into mass ratios. I present the results of a survey of several dozen T Tauri M stars in the Ophiuchus molecular cloud complex. Each star was observed at 3-4 epochs over 3 years with the 10 meter Keck II telescope. At least 4 of the objects are newly discovered spectroscopic binaries, two of which are located within sub-arcsecond visual binaries, yielding hierarchical triple systems. In addition, three other sub-arcsecond visual binaries were identified. The overall spectroscopic multiplicity of the entire sample is comparable to that of earlier type pre-main-sequence objects. The visual multiplicity of the sample also appears to be high, although only about one fourth of the stars have been observed at high angular resolution. Therefore, the dearth of low-mass binaries recently noted in the literature may be the result of dynamical evolution or possibly a selection effect, given the challenges of high spectroscopic and angular resolution observations of faint, low-mass targets.
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