Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..490j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 1, 1986, p. 490-500.
Astronomy and Astrophysics
Astrophysics
28
Abundance, Andromeda Galaxy, Interstellar Matter, Planetary Nebulae, Astronomical Spectroscopy, H Ii Regions, Helium, Hydrogen, Metallicity, Neon, Nitrogen, Oxygen, Radial Velocity
Scientific paper
Observation of three planetary nebulae and an H II region at projected distances of 3.5, 18, and 33 kpc have yielded chemical abundances in M31's disk and halo. It is noted that abundances are high in M31's interstellar medium by comparison with the galaxy, and that here has been little enrichment since the birth of the planetary nebula progenitors more than 2 billion years ago. Kinematical considerations indicate that M31-290 and M31-372 belong to a halo population similar to that of M31's globular clusters. In contrast to the Galaxy, little evidence is found for a relationship between kinematics and metallicity in the halo of M31; the evidence suggests that a wide range of metal enrichment occurred during the collapse of M31's halo, with only weak progressive enrichment toward its center.
Ford Holland C.
Jacoby George H.
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