Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933916s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #339.16
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of a detailed abundance analysis of the solar twins 16 Cyg A and 16 Cyg B based on Keck/HIRES spectroscopy. 16 Cygni is a triple star system with the two solar-twin primary stars and a proper-motion M dwarf companion of 16 Cyg A. 16 Cyg B is known to host a giant planet on an eccentric orbit (e=0.69) while no planets have yet been detected around 16 Cyg A. The abundances of 15 elements have been derived and are found to be indistinguishable between the two stars. The abundances of each element differ by <= 0.026 dex, and the mean abundance difference is +0.003 +/- 0.015 (sigma) dex. Aside from Li, which has been previously shown to be depleted by a factor of at least 4.5 in 16 Cyg B relative to 16 Cyg A, the two stars appear to be chemically identical. The physical characteristics of the 16 Cyg system are discussed in terms of planet formation models, and a consistent scenario that can account for the lack of detected planets around 16 Cyg A, the disparate Li abundances of 16 Cyg A and B, and the eccentricity of the planet 16 Cyg B b is presented.
S.C.S. acknowledges support provided by the NOAO Leo Goldberg Fellowship; NOAO is operated by AURA, Inc., under a cooperative agreement with the NSF.
Boesgaard Ann Merchant
Cunha Katia
Deliyannis Constantine P.
Ghezzi Luan
King Jeremy R.
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