The Astronomical Journal, 143:42 (19pp), 2012 February doi:10.1088/0004-6256/143/2/42 C 2012. The American Astronomical Society. All rights reserved. Printed in the U.S.A. SPECKLE INTERFEROMETRY AT SOAR IN 2010 AND 2011: MEASURES, ORBITS, AND RECTILINEAR FITS∗ William I. Hartkopf1, Andrei Tokovinin2, and Brian D. Mason1 1 U.S. Naval Observatory, 3450 Massachusetts Ave., Washington, DC, USA;
[email protected],
[email protected] 2 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile;
[email protected] Received 2011 October 5; accepted 2011 November 4; published 2012 January 12 ABSTRACT We report on the results of speckle observations at the 4.1 m SOAR telescope in 2010 and 2011. A total of 639 objects were observed. We give 562 measurements of 418 resolved binaries, including 21 pairs resolved for the first time, and upper detection limits for 221 unresolved stars. New orbital elements have been determined for 42 physical pairs, of which 22 are first-time calculations; the rest are corrections, sometimes substantial. Linear elements are calculated for nine apparently optical doubles. We comment on new pairs, new orbital solutions, and other remarkable objects. Key words: binaries: general – techniques: interferometric Online-only material: color figures, machine-readable and VO tables 1. INTRODUCTION 2010; Mason & Hartkopf 2011a, 2011b), due in large measure to efforts such as these. Continuing monitoring of orbital mo- Binary stars are one of the foundations of astronomy. Like tion is needed for further progress, however. Many close pairs any “infrastructure,” they tend to be neglected in favor of resolved recently have periods shorter than 20 years and need more fashionable topics.