Low-Mass Tertiary Companions to Spectroscopic Binaries: Common Proper Motion Survey for Wide Companions using 2MASS

Details Low-Mass Tertiary Companions to Spectroscopic Binaries: Common Proper Motion Survey for Wide Companions using 2MASS Low-Mass Tertiary Companions to Spectroscopic Binaries: Common Proper Motion Survey for Wide Companions using 2MASS

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..824a&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

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Binary And Multiple Stars, Star Formation, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs

Scientific paper

I have conducted a wide-field common proper motion companion survey surrounding a volume-limited sample of spectroscopic binaries with measured proper motions >0.1''/yr. The aim was to examine the predictions set out in recent star formation simulation results [9, 4] that the fraction of wide (separations greater than a few tens of AU) low-mass companions to spectroscopic binaries is significantly higher than compared to that of `single' stars. Here I report the first results of a multi-epoch search for those wide, low-mass tertiary companions. These efforts focused on wide-field imaging of a volume-limited sample of 117 known spectroscopic binaries within 30 pc of the Sun, of which I currently have data for 77. I used the 2MASS Point Source Catalog to provide first epoch astrometry and the observations using the 4 m telescopes at KPNO and CTIO provide the second epoch. In this way, I probed for CPM companions with separations from roughly 100 AU to 10,000 AU. I recovered 11 previously known tertiaries, 3 known candidate tertiaries of which 2 are spectroscopically confirmed and one rejected, and 4 new candidates of with two are confirmed and the other two rejected.

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