NOAO >   Observing Info >   Approved Programs >   2006A-0230

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Proposal Information for 2006A-0230


PI: Brian Mason, U.S. Naval Observatory, bdm@usno.navy.mil
Address: Astrometry, 3450 Massachusetts Avenue, NW, Washington, DC 20392-5420, USA

CoI: William I. Hartkopf, U.S. Naval Observatory
CoI: Douglas R. Gies, Georgia State University
CoI: Todd J. Henry, Georgia State University
CoI: Andrei A. Tokovinin, Cerro Tololo Inter-American Observatory

Title: Speckle Interferometry of Massive and Cluster Stars

Abstract: Conducted on NOAO 4-m telescopes in 1994, the first speckle survey of O stars (Mason et al. 1998) had success far in excess of our expectations. In addition to the frequently cited multiplicity analysis, many of the new systems which were first resolved in this paper are of significant astrophysical importance. Now, some ten years after the original survey, we propose to re-investigate all systems analyzed before (N=195). Improvements in detector technology will allow for the detection of companions missed before as well as systems which may have been closer than the resolution limit in 1994. We will also make a first high-resolution inspection of the additional O stars (N=108) in the recent Galactic O Star Catalog of Maiz- Apellaniz & Walborn (2004). Further, we propose to investigate several additional samples of interesting objects, including 15 accessible Galactic WR stars from the speckle survey of Hartkopf et al. (1999), 16 massive, hot stars with separations which would indicate their applicability for mass determinations (for fully detached O stars masses are presently known for only twelve pairs), and 56 multiple stars for a study of their co- planarity statistics.


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