Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Abundances in the Galaxy: field stars
- 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
- 36 Massive-star evolution at high metallicity
- 37 Supernovae in Galactic evolution: direct and indirect metallicity effects
- 38 Progenitor evolution of Type-I supernovae: evolution and implications for yields
- 39 Star formation in the metal-rich Universe
- 40 Metallicity of Solar-type main-sequence stars: seismic tests
- 41 Chemical-abundance gradients in early-type galaxies
- 42 Oxygen-rich droplets and the enrichment of the interstellar medium
- Part VII Chemical and photometric evolution beyond Solar metallicity
42 - Oxygen-rich droplets and the enrichment of the interstellar medium
Published online by Cambridge University Press: 02 December 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Abundances in the Galaxy: field stars
- 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
- 36 Massive-star evolution at high metallicity
- 37 Supernovae in Galactic evolution: direct and indirect metallicity effects
- 38 Progenitor evolution of Type-I supernovae: evolution and implications for yields
- 39 Star formation in the metal-rich Universe
- 40 Metallicity of Solar-type main-sequence stars: seismic tests
- 41 Chemical-abundance gradients in early-type galaxies
- 42 Oxygen-rich droplets and the enrichment of the interstellar medium
- Part VII Chemical and photometric evolution beyond Solar metallicity
Summary
We argue that the discrepancies observed in H ii regions between abundances derived from optical recombination lines (ORLs) and collisionally excited lines (CELs) might well be the signature of a scenario of the enrichment of the interstellar medium (ISM) proposed by Tenorio-Tagle (1996). In this scenario, the fresh oxygen released during massive supernova explosions is confined within the hot superbubbles as long as supernovae continue to explode. Only after the last massive supernova explosion does the metal-rich gas start to cool down and fall onto the galaxy in the form of metal-rich droplets. Full mixing of these metal-rich droplets and the ISM occurs during photoionization by the next generations of massive stars. During this process, the metal-rich droplets give rise to strong recombination lines of the metals, leading to the observed ORL–CEL discrepancy.
- Type
- Chapter
- Information
- The Metal-Rich Universe , pp. 409 - 412Publisher: Cambridge University PressPrint publication year: 2008