Computer Science – Databases
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.1404m&link_type=abstract
American Astronomical Society, DDA meeting #31, #14.04
Computer Science
Databases
Scientific paper
The United States Naval Observatory (USNO) is in the process of preparing an input catalog of SIM grid stars by utilizing existing databases, observing capabilities, and instrumental development. The SIM grid should be astrometrically stable at the 4 mu as level over the five year life of the program, therefore, double and multiple stars must be avoided. Stars in the apparent magnitude range 6.5 < m_v < 8.5 with spectral types from A5V through G5V are being considered. Known doubles have been eliminated, and proper motions will identify previously unknown, wide pairs. This program involves a comprehensive selection and observing program, the first half year of which has seen candidate selection and the start of survey observations with the USNO speckle camera. In later years, further elimination of doubles will be made astrometrically with the Navy Prototype Optical Interferometer and wide-field CCD work. In addition, a Fourier Transform Spectrometer (FTS), with a potential for sub-meter per second radial velocity determinations, is being developed to eliminate companions (both stellar and substellar). In total, 7,200 candidate stars, evenly distributed over the sky will be examined observationally. The combination of the four astrometric methods will remove double and multiple systems in the ~ 15 arcsec to ~ 1 milliarcsecond range with Delta m_v of 3.5 magnitudes, while the FTS is expected to detect companions with masses as low as Saturn in the range of 0.1 to 10 au. The first year of the program has thus far seen significant progress. The SIM grid candidate list has been prepared and speckle observations of these candidates have begun: in the northern hemisphere, by the USNO and the RIT/Yale group (Elliott Horch & Zoran Nikov, Rochester Institute of Technology and William van Altena, Yale).
Corbin Thomas E.
Hajian Arsen R.
Hummel Christian A.
Mason Brian D.
Rafferty Theodore J.
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