Astron. Astrophys. 355, 929-948 (2000)

On radial gas flows, the Galactic Bar and chemical evolution in the Galactic Disc

L. Portinari and C. Chiosi

Department of Astronomy, University of Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy (portinari, chiosi@pd.astro.it)

Received 24 August 1999 / Accepted 3 January 2000

Abstract

We develop a numerical chemical model allowing for radial flows of gas, with the aim to analyse the possible role of gas flows in the chemical evolution of the Galactic Disc. The dynamical effects of the Galactic Bar on the radial gas profile of the Disc are especially addressed.

Key words: Galaxy: abundances Galaxy: evolution Galaxy: general Galaxy: structure

Send offprint requests to: L. Portinari

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Contents

• 1. Introduction
• 2. Radial flows: previous literature
• 3. Modelling radial flows
  • 3.1. Boundary conditions
    • 3.1.1. The innermost shell
    • 3.1.2. Boundary conditions at the disc edge
    • 3.1.3. The outermost shell
  • 3.2. The numerical solution
• 4. Effects of radial inflows on the disc
  • 4.1. Models with inflow from the outer disc
  • 4.2. Models with no inflow from the outer disc
  • 4.3. Concluding remarks
• 5. Some "successful" models
  • 5.1. Models with Schmidt law
  • 5.2. Models with spiral-triggered SF laws
  • 5.3. Models with gravitational self-regulating SF laws
  • 5.4. Concluding remarks
• 6. The role of the Galactic Bar
  • 6.1. Modelling the effects of the Bar: case A
  • 6.2. Modelling the effects of the Bar: case B
  • 6.3. Concluding remarks
• 7. Summary and conclusions
• Acknowledgements
• Appendices
  • A: The explicit expression of Eq. (18)
  • B: Testing the numerical model
• References

© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000
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