Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5701r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #57.01; Bulletin of the American Astronomical Society, Vol. 39, p.830
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a visual orbit for the spectroscopic binary, HD 146361, derived from observations at the CHARA Array's long baseline interferometer. The 26 calibrated visibility measurements obtained during May - July 2007 allow us to determine a full orbital solution and component masses for this known spectroscopic binary. The HD 146361 pair has a circular orbit of nearly equal-mass components with a good quality double-lined spectroscopic orbit (Dave Latham, private communication). We have adopted the well-constrained spectroscopic orbital elements and fit the angular semi-major axis, inclination, and longitude of nodes to the binary visibility curve equations. Using these elements and the Hipparcos parallax of 46.11 ± 0.98 mas, we obtain component masses of 1.046 ± 0.084 Msol and 1.000 ± 0.080 Msol. We have planned further observations of this system to reduce the mass uncertainties and may present an updated result at the meeting. This is the shortest period spectroscopic binary resolved as of yet with an interferometer.
This work is being done in the context of Raghavan's thesis project, which is a survey of solar-type stars in the solar neighborhood. By completing this survey, we hope to build a comprehensive view of the environments around solar-type stars and improve our understanding of their habitats by analyzing their companions of all types - stars, brown dwarfs, and planets. We have chosen an unbiased, volume-limited sample of 455 primary stars as representatives of the solar-type stars in our Galaxy. Our effort is a modern update to the seminal work of Duquennoy & Mayor (1991) and will contribute to the broader subjects of stellar evolution and planetary system formation, evolution, and stability. Research at the CHARA Array is supported by the College of Arts and Sciences at Georgia State University and by the National Science Foundation through NSF Grant AST 0606958.
McAlister Harold A.
Raghavan Deepak
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