NOAO >   Observing Info >   Approved Programs >   2016A-0005

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Program Information for 2016A-0005


PI: Andrei Tokovinin, NOAO, atokovinin@ctio.noao.edu
Address: CTIO, Casilla 603 AURA, La Serena Chile

CoI: Brian D Mason, US Naval Observatory
CoI: William I Hartkopf, US Naval Observatory

Title: Dynamics of resolved triple systems and ``fast'' binaries

Abstract: High angular resolution of speckle interferometry enabled the discovery of an unusual class of multiple systems with comparable separations between components, straddling the dynamical stability limit. Detailed study of one such system, HD 91962, revealed that the two inner orbits are in a 1:19 resonance, while all orbits have low eccentricity and are close to coplanarity. This suggests a special formation mechanism, possibly involving dissipative evolution in a disk. We will monitor several other similar resolved multiple systems with a goal of determining their inner and outer orbits. looking for resonances and studying orbit coplanarity. We will also continue collecting positional measurements of many tight nearby binaries with orbital periods of a few years for determination of their orbits, to serve various astrophysical programs.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  SOAR/HRCam -- 0.5n on Feb 18 2016


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016A-0005

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