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
- 24 The stellar initial mass function of metal-rich populations
- 25 Initial-mass-function effects on the metallicity and colour evolution of disc galaxies
- 26 The metallicity of circumnuclear star-forming regions
- 27 The stellar population of bulges
- 28 The metallicity distribution of the stars in elliptical galaxies
- 29 Wolf–Rayet populations at high metallicity
- 30 The stellar populations of metal-rich starburst galaxies: the frequency of Wolf–Rayet stars
- 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
26 - The metallicity of circumnuclear star-forming regions
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
- 24 The stellar initial mass function of metal-rich populations
- 25 Initial-mass-function effects on the metallicity and colour evolution of disc galaxies
- 26 The metallicity of circumnuclear star-forming regions
- 27 The stellar population of bulges
- 28 The metallicity distribution of the stars in elliptical galaxies
- 29 Wolf–Rayet populations at high metallicity
- 30 The stellar populations of metal-rich starburst galaxies: the frequency of Wolf–Rayet stars
- 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 present a spectrophotometric study of circumnuclear star-forming regions (CNSFRs) in the early-type spiral galaxies NGC 2903, NGC 3351 and NGC 3504, all of them of over Solar metallicity according to standard empirical calibrations. A detailed determination of their abundances is performed after careful subtraction of the very prominent underlying stellar absorption. It is found that most regions exhibit the highest abundances in H II-region-like objects. The relative N/O and S/O abundances are discussed. It is also shown that CNSFRs, as a class, segregate from the disk H II region family, clustering around smaller “softness parameter” – η′ – values, and therefore higher ionizing temperatures.
- Type
- Chapter
- Information
- The Metal-Rich Universe , pp. 255 - 260Publisher: Cambridge University PressPrint publication year: 2008