NOAO >   Observing Info >   Approved Programs >   2002A-0017

Small NOAO Logo

Proposal Information for 2002A-0017


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



NOAO >   Observing Info >   Approved Programs >   2002A-0017

noaoprop-help@noao.edu

Small NOAO Logo