Using cepheids to derive galactic abundance gradient. The outer disk.

Details Using cepheids to derive galactic abundance gradient. The outer disk. Using cepheids to derive galactic abundance gradient. The outer disk.

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop...17a&link_type=abstract

NOAO Proposal ID #2002A-0017

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Scientific paper

In recent years the problem of radial abundance gradients in spiral galaxies has emerged as a central problem in the field of galactic chemodynamics. Abundance gradients as observational characteristics of the galactic disk are among the most important input parameters in any theory of galactic chemical evolution. Further development of theories of galactic chemodynamics is dramatically hampered by the scarcity of observational data, their large uncertainties and, in some cases, apparent contradictions between independent observational results. Many questions concerning the present-day abundance distribution in the galactic disk, its spatial properties, and evolution with time, still have to be answered. For this we propose to use galactic Cepheids. Compared to other objects supplying us with an information about the radial distribution of abundances in the galactic disk Cepheids afford several advantages: they are primary distance calibrators; they are luminous stars allowing one to probe to large distances; the abundances of many chemical elements can be measured from Cepheid. Present proposal is aimed to extend our previous study of abundance gradients in the inner and middle parts of the disk towards the larger galactocentric radii.

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