An H76-alpha survey of galactic H II regions - Electron temperature and element gradients

Details An H76-alpha survey of galactic H II regions - Electron temperature and element gradients An H76-alpha survey of galactic H II regions - Electron temperature and element gradients

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..211w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 1, Oct. 1983, p. 211-219.

Astronomy and Astrophysics

Astronomy

87

Abundance, Electron Energy, H Alpha Line, H Ii Regions, Milky Way Galaxy, Radio Sources (Astronomy), Continuous Spectra, Distance, Galactic Radio Waves, Oxygen, Radiative Recombination, Thermodynamic Equilibrium

Scientific paper

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 measurements show that these temperatures accurately represent the electron temperature T(e). A gradient in T(e) is found, with T(e) = 4800 + 270D(GC), where D(GC) is the distance from the galactic center in kpc and ranges from 4 to 17. The correlation coefficient is 0.70; T(e) does not depend on the distance from the sun. At a given D(GC), the scatter in T(e) from source to source barely exceeds the noise. The T(e) values for the nine H II regions in the galactic center are 2000 K larger than the value extrapolated from the disk. A relation for T(e) and the (O/H) ratio is determined which does not fit the H II regions in the galactic center. Either the (O/H) ratio is close to the solar system value or it is larger and additional heat sources are present.

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