Radio and optical spectroscopy have been combined to measure chemical abundances in a
large and representative sample of galactic H ii regions covering a wide range in …

The distribution of metals in the Galaxy provides important information about galaxy
formation and evolution. H ii regions are the most luminous objects in the Milky Way at mid …

Recombination lines at radio wavelengths have been-and still are-a pow erful tool for
modern astronomy. For more than thirty years they have allowed astronomers to probe the …

We derive the electron temperature gradient in the Galactic disk, using a sample of H II
regions that spans Galactocentric distances of 0-17 kpc. The electron temperature was …

Gradients in the physical conditions of M101 and the pregalactic helium abundanc ADS Classic
is now deprecated. It will be completely retired in October 2019. This page will automatically …

Elemental abundance patterns in the Galactic disk constrain theories of the formation and
evolution of the Milky Way. H ii region abundances are the result of billions of years of …

Hydrogen recombination lines at 15 and 22 GHz and hydroxyl (OH) maser emission at 1.6
GHz have been mapped toward nine compact H II regions using the VLA. The authors find …

Measurements of the H76-alpha line and continuum data for 84 H II regions are used to
obtain LTE electron temperatures. Comparisons with model calculations and other …

This work deals with some of the most typical complexes of interstellar matter and is
intended to serve both as a reference book for the specialist and as an introduction for the …

Determination of N/O from far-infrared line observations of Galactic H II region ADS Classic is
now deprecated. It will be completely retired in October 2019. This page will automatically …