Isotopic Titanium Abundances in Local M Dwarfs

Abstract

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.

33 pages, 8 figures, accepted for publication in ApJ

References in corpus (15)

• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$
• Galactic Chemical Evolution: Hydrogen Through Zinc
• Elemental Abundance Survey of The Galactic Thick Disk
• Galactic chemical evolution: Carbon through Zinc
• Explosive yields of massive stars from Z=0 to Z=Zsun
• M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale
• Nucleosynthesis in Type Ia Supernovae
• Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk
• M dwarfs: effective temperatures, radii and metallicities
• Metallicity measurements using atomic lines in M and K dwarf stars
• Si Isotopic Ratios in Mainstream Presolar SiC Grains Revisited
• Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test of Model Atmospheres
• The Narrowest M-dwarf Line Profiles and the Rotation-Activity Connection at Very Slow Rotation
• Visual orbit of GJ 164 AB

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• The Rotationally Resolved Infrared Spectrum of TiO and Its Isotopologues
• The Chemical Evolution of Globular Clusters - II. Metals and Fluorine
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• Measuring titanium isotope ratios in exoplanet atmospheres
• The Missing Link: Testing Galactic Chemical Evolution Models with the First Multi-Isotopic Abundances in Solar Twin Stars
• The breaking of cold traps and onset of titanium in ultra-hot Jupiter atmospheres: WASP-189b in context