Lin, Chi-Long and Zhang, Zhi-Wei and Chen, W. P. and King, Sun-Kun and Lin, Hung-Chin and Wang, J.-H. and Mondal, S. and Alcock, C. and Axelrod, T. and Bianco, F. B. and Byun, Y.-I. and Coehlo, N. K. and Cook, K. H. and Dave, R. and de Pater, I. and Descamps, P. and Lehner, M. J. and Kim, D. W. and Lee, T. and Lissauer, J. J. and Marshall, S. L. and Porrata, R. and Protopapas, P. and Rice, J. A. and Schwamb, M. E. and Wang, S.-Y. and Wen, C.-Y. (2009) A Close Binary Star Resolved from Occultation by 87 Sylvia. Publications of the Astronomical Society of the Pacific, 121 (878). pp. 359-364. ISSN 0004-6280 http://resolver.caltech.edu/CaltechAUTHORS:20090904-105651754
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The star BD +29 1748 was resolved to be a close binary from its occultation by the asteroid 87 Sylvia on 2006 December 18 UT. Four telescopes were used to observe this event at two sites separated by some 80 km. Two flux drops were observed at one site, whereas only one flux drop was detected at the other. From the long-term variation of Sylvia, we inferred the probable shape of the shadow during the occultation, and this in turn constrains the binary parameters: the two components of BD +29 1748 have a projected separation of 0.ʺ097–0.ʺ140 on the sky with a position angle 104°–110°. The asteroid was clearly resolved, with a size scale ranging from 130 to 290 km as projected onto the occultation direction, consistent with the size dimensions 385 × 265 × 230 km, measured by direct adaptive optics imaging. No occultation was detected for either of the two known moonlets of 87 Sylvia.
|Additional Information:||© 2009 The Astronomical Society of the Pacific. Received 2009 January 12; accepted 2009 March 5; published 2009 May 6. We thank David W. Dunham, Sato Isao, Dave Herald, and Mitsuru Soma for helpful discussions. KHC’s work has been performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. We acknowledge the anonymous referee, whose suggestions improved the quality of the paper.|
|Official Citation:||A Close Binary Star Resolved from Occultation by 87 Sylvia Chi-Long Lin, Zhi-Wei Zhang, W. P. Chen, Sun-Kun King, Hung-Chin Lin, J.-H. Wang, S. Mondal, C. Alcock, T. Axelrod, F. B. Bianco, Y.-I. Byun, N. K. Coehlo, K. H. Cook, R. Dave, I. de Pater, P. Descamps, M. J. Lehner, D.-W. Kim, T. Lee, J. J. Lissauer, S. L. Marshall, R. Porrata, P. Protopapas, J. A. Rice, M. E. Schwamb, S.-Y. Wang, and C.-Y. Wen Publications of the Astronomical Society of the Pacific 2009 121:878, 359-364.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||22 Sep 2009 18:24|
|Last Modified:||26 Dec 2012 11:19|
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