Isotopic Titanium Abundances in Local M Dwarfs

Details Isotopic Titanium Abundances in Local M Dwarfs Isotopic Titanium Abundances in Local M Dwarfs

2009-05-17

arxiv.org/abs/0905.2762v1

Astrophys.J.699:1906-1918,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

33 pages, 8 figures, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/699/2/1906

Relative abundances of the five stable isotopes of titanium (^46Ti to ^50Ti) are measured for 11 M dwarfs belonging to the thin disk (four stars), thick disk (three stars), the halo (one star), and either the thick or the thin disk (three stars). Over the metallicity range of the sample (-1<[Fe/H]<0), the isotopic ratios are approximately constant to the solar system ratios. There is no discernible difference between the isotopic ratios for thin and thick disk stars. Isotopic ratios are in fair accord with recent calculations of Galactic chemical evolution despite the fact that such calculations underpredict [Ti/Fe] by about 0.4 dex at all metallicities.

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