By F. Matteucci (auth.), Francesca Matteucci, Franco Giovannelli (eds.)

This booklet is a evaluation of the main updated observational and theoretical details in regards to the chemical evolution of the Milky manner. A comparability among the abundances derived from box stars and clusters is gifted including info at the abundances and dynamics of gasoline. The position of supernovae and novae at the chemical enrichment historical past of our Galaxy is mentioned within the framework of the main complex and specified chemical evolution types. The problems in acquiring trustworthy abundance measurements in addition to specified predictions approximately stellar nucleosynthesis and chemical abundances within the interstellar medium are severely mentioned via experts within the box. attainable mechanisms for the formation and evolution of the Milky manner are prompt at the foundation of comparability among thought and observations.

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References Abia, C. & Rebolo, R. 1989, ApJ, 347, 186 Argast, D. & Samland, M. 1999, The Galactic Halo: from Globular Clusters to Field Stars, 35 th Liege Int. Astroph. , in press 3. Audouze, J. & Silk, J. 1995, ApJ, 451, L49 4. Barbuy, B. 1988, A&A, 191, 121 5. Barbuy, B. , Beers, T. , Nordstrom, B. & Nissen, P. E. 1997, A&A, 317, L63 1. 2. 23 6. 7. 8. 9. 10. , & Spite, M. 1985, A&A, 144, 343 Beers, T. , Preston, G. W. & Shectman, S. A. 1992, AJ, 103, 1987 Bessell, M. S. & Norris, J. E. 1984, ApJ, 285, 622 Bessell, M.

When Luck et al. [Fe/R] are compared to Geneva [MIR], the VSL stars follow the same relation as the normal giants, without noticeable effect of CN anomalies. Since C,N,O abundances vary in lockstep with that of Fe, prior to the first dredge-up, photometric metallicities provide reliable estimates of the initial [Fe/R] for main sequence and subgiant stars. The spread in mass among old disc giants is small enough to allow reliable photometric [MIR] determinations also for GB and RRB giants. 4. Dredge-up effects A cosmic scatter in CN abundance must exist among giant stars in GB and RHB phases because of the spread in ages, hence in masses.

1. ~- ... -:. 50 • ••• ~ • 'II • • • • • • • • • • • • o 1 • l"~ • •• ~.. _ ': ·,;l·~:~·:1 .. 1... , ~" • '. , 1 1 _ .. :. " • • ... :. _\ 1 . . . . . . . . ' -100 II .. :'... ~ ••~ • •:: 1. :: ... 1; : -50 ... 1. -50 ~. :l·. . •• •• o 50 V Figure 2. 25]. 35. Stars with the smallest V show little scatter in U, an indicat ion that 52 these star have their apocenter at the solar galactocentric distance.

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