173 citations · 523 across the 7 of their papers we have counts for
7 papers
Oxygen abundance distribution in Galactic disc
S. A. Korotin, S. M. Andrievsky, R. E. Luck +3
We have performed a NLTE analysis of the infrared oxygen triplet for a large number of cepheid spectra obtained with the Hobby-Eberly telescope. These data were combined with our p…
Chemical evolution of the galactic bulge: single and double infall models
R. D. D. Costa, W. J. Maciel, A. V. Escudero
Recent work has produced a wealth of data concerning the chemical evolution of the galactic bulge, both for stars and nebulae. Present theoretical models generally adopt a limited…
Using Cepheids to determine the galactic abundance gradient. III.First results for the outer disc
S. M. Andrievsky, V. V. Kovtyukh, R. E. Luck +3
As a continuation of our previous work, which concerned the radial abundance distribution in the galactic disc over the distances 4-10 kpc this paper presents the first results on…
Using Cepheids to determine the galactic abundance gradient I. The solar neighbourhood
S. M. Andrievsky, V. V. Kovtyukh, R. E. Luck +7
A number of studies of abundance gradients in the galactic disk have been performed in recent years. The results obtained are rather disparate: from no detectable gradient to a rat…
Using Cepheids to determine the galactic abundance gradient II. Towards the galactic center
S. M. Andrievsky, D. Bersier, V. V. Kovtyukh +4
Based on spectra obtained at the Anglo-Australian Observatory, we present a discussion of the metallicity of the galactic disc derived using Cepheids at galactocentric distances 4-…
Helium contamination from the progenitor stars of planetary nebulae: The He/H radial gradient and the Delta Y/Delta Z enrichment ratio
W. J. Maciel
In this work, two aspects of the chemical evolution of 4He in the Galaxy are considered on the basis of a sample of disk planetary nebulae (PN). First, an application of correction…