Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Abundances in the Galaxy: field stars
- 1 Metal-rich stars and stellar populations: a brief history and new results
- 2 The metal-rich nature of stars with planets
- 3 Solar chemical peculiarities?
- 4 Kinematics of metal-rich stars with and without planets
- 5 Elemental abundance trends in the metal-rich thin and thick disks
- 6 Metal-rich massive stars: how metal-rich are they?
- 7 Hercules-stream stars and the metal-rich thick disk
- 8 An abundance survey of the Galactic thick disk
- Part II Abundances in the Galaxy: Galactic stars in clusters, bulges and the centre
- Part III Observations – abundances in extragalactic contexts
- Part IV Stellar populations and mass functions
- Part V Physical processes at high metallicity
- Part VI Formation and evolution of metal-rich stars and stellar yields
- Part VII Chemical and photometric evolution beyond Solar metallicity
6 - Metal-rich massive stars: how metal-rich are they?
Published online by Cambridge University Press: 02 December 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Abundances in the Galaxy: field stars
- 1 Metal-rich stars and stellar populations: a brief history and new results
- 2 The metal-rich nature of stars with planets
- 3 Solar chemical peculiarities?
- 4 Kinematics of metal-rich stars with and without planets
- 5 Elemental abundance trends in the metal-rich thin and thick disks
- 6 Metal-rich massive stars: how metal-rich are they?
- 7 Hercules-stream stars and the metal-rich thick disk
- 8 An abundance survey of the Galactic thick disk
- Part II Abundances in the Galaxy: Galactic stars in clusters, bulges and the centre
- Part III Observations – abundances in extragalactic contexts
- Part IV Stellar populations and mass functions
- Part V Physical processes at high metallicity
- Part VI Formation and evolution of metal-rich stars and stellar yields
- Part VII Chemical and photometric evolution beyond Solar metallicity
Summary
We discuss the metallicity of massive stars in the Solar neighbourhood, comparing new results with those for the Sun. We find that, despite there being small systematic differences between various NLTE determinations of [O/H] in hot stars, there is reasonable agreement among results from various studies of nearby stars, with a value of 8.60±0.1 dex being implied. This is in good agreement with the latest Solar estimate based on three-dimensional models, and is in good agreement with recent estimates of the nebular oxygen abundance in Orion. We review the evidence for metal-rich massive stars in our own galaxy and in M31, concluding that there is little convincing evidence for supersolar [O/H] in massive stars in the Milky Way, while there is only limited evidence for mildly metal-rich regions in M31 with [O/H] relative to Solar of only +0.2. Discrepancies between stellar and nebular abundances at high metallicity can be traced to problems in calibrating the R23 index for H II regions in the metal-rich regime.
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- Information
- The Metal-Rich Universe , pp. 53 - 61Publisher: Cambridge University PressPrint publication year: 2008