HD 199143 and HD 358623: Two recently identified members of the βPictoris moving group

Creators: Kaisler, D.; Zuckerman, B.; Song, I.; Macintosh, B. A.; Weinberger, A. J.; Becklin, E. E.; Konopacky, Q. M.; Patience, J.

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Abstract

HD 199143 and HD 358623 (BD-17°6128) are two sets of binary stars which are physically associated and 48 pc from Earth. We present heliocentric radial velocities and high lithium abundances which establish these stars as members of the ~12 Myr-old β Pictoris Moving Group. We also present mid-IR photometric measurements which show no firm evidence for warm dust around all four stars.

Additional Information

© ESO, 2004. Received 18 March 2003 / Accepted 9 October 2003. We would like to thank Randy Campbell, Jay Farihi, and Patrick Lowrance for their useful input to this study, as well as the referees, Drs. A. Brandeker and R. Liseau. This research was supported in part by a NASA grant to UCLA and by NASA's Astrobiology Institute. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space administration. The Observatory was made possible by the generous financial support of the W. M. Keck foundation.

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