The question of vertical abundances gradients in the Galaxy from PN

Details The question of vertical abundances gradients in the Galaxy from PN The question of vertical abundances gradients in the Galaxy from PN

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aca....43..455c&link_type=abstract

Acta Astronomica, vol. 43, no. 4, p. 455-458

Astronomy and Astrophysics

Astronomy

1

Abundance, Astronomical Models, Chemical Composition, Chemical Evolution, Galactic Evolution, Interstellar Chemistry, Interstellar Matter, Milky Way Galaxy, Planetary Nebulae, Vertical Distribution, Astronomical Spectroscopy, Balmer Series, Light (Visible Radiation), Radio Astronomy, Stellar Spectra

Scientific paper

We have investigated the chemical vertical structure of the Galaxy from planetary nebulae. The vertical resolution scale is of the order of 500 pc. A vertical gradient may exit in the first 5 kpc of galactocentric distance. Until now, however, a very important constraint to models of galactic evolution has been missing: the masses of the planetary nebulae nuclei. The masses, assuming a nucleus-progenitor masses relationship, would allow the ages of the progenitors to be determined. Therefore, it would be possible to extract a vertical ages gradient.

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