NOAO > Observing Info > Approved Programs > 2002A-0017
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NOAO > Observing Info > Approved Programs > 2002A-0017 |
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PI: Sergei M. Andrievsky, Dpt of Astronomy and Astronomical Observatory, Odessa State University, scan@deneb.odessa.ua
Address: Shevchenko Park, Odessa 65014, Ukraine
CoI: David Bersier, Harvard-Smithsonian Center for Astrophysics
CoI: Patrick Francois, Observatoire de Paris
CoI: Jacques Lepine, Instituto Astronomico e Geofisico, Universidade de Sao Paulo
CoI: Walter Maciel, Instituto Astronomico e Geofisico, Universidade de Sao Paulo
Title: Using cepheids to derive galactic abundance gradient. The outer disk.
Abstract:
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.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2002A-0017 |
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