PI: Andrei Tokovinin, NOAO, email@example.com
Address: CTIO, Casilla 603 AURA, La Serena, Chile
Title: Snapshot RV survey of secondary components
Abstract: Statistics of hierarchical multiple systems with solar-type primaries in a large sample within 67 pc reveals new interesting trends. Some wide low-mass companions to these stars are themselves close binaries, and at least 10% of wide binaries are quadruple stars composed of two close pairs, indicating that these 2+2 quadruples formed by a distinct process. It is predicted that many more sub-systems in secondary components remain undiscovered. We will constrain the frequency of short-period sub-systems in relatively bright secondary components by taking a single ``snapshot'' spectrum. Sub-systems will be revealed by radial-velocity difference with the primary component or by double lines. These data will double the census of short-period sub- systems in order to confirm and strengthen the statistical trends established so far.
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