Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B

Details Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57...83t&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.57, No.1, pp. 83-96

Astronomy and Astrophysics

Astronomy

10

Stars: Abundances, Stars: Atmospheres, Stars: Fundamental Parameters, Stars: Individual (Hd 20630, Hd 76151, Hd 134987, Hd 181655, Hd 186408, Hd 186427, Hd 195019, Hd 217014), Stars: Late-Type

Scientific paper

A method is presented for very accurately establishing the differences of the atmospheric parameters (the effective temperature, the surface gravity, the microturbulent velocity, and the Fe abundance) between two similar stars by using the equivalent widths of Fe I and Fe II lines, which is a variant of the numerical solution-search approach developed by Takeda et al. (2002, PASJ, 54, 451), while being inspired by the spirit of the orthodox ``differential curve-of-growth'' procedure. By applying this technique to eight selected stars similar to the Sun [HD 20630, 76151, 134987, 181655, 186408 (16 Cyg A), 186427 (16 Cyg B), 195019, and 217014] along with the Sun itself, the parameter differences between any pairs of these stars could be successfully determined to precisions of ˜ 10 K (in ΔTeff), ˜ 0.02dex (in Δlog g), ˜0.02 km s-1 (in Δv t), and ˜ 0.01 dex (in ΔA Fe). Regarding 16 Cyg A and B, a well-known ``solar twin'' system where a planet has been detected only in B, the metallicities of these two components were concluded to be essentially the same to a level of ≲ 0.01 dex.

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