Results 311 to 320 of about 1,861,445 (361)

Extragalactic H Ii Regions

Annual Review of Astronomy and Astrophysics, 1990
Article de synthese sur les regions H II extragalactiques traitant des morphologies, de la cinematique, des etoiles ionisantes et des abondances ...
openaire   +1 more source

Shell-like H II regions

Astrophysics, 1984
The structure of a H II region in the neighborhood of a star with wind is considered. In the initial stages, when the wind pressure is high, the ionized gas collects in a thin shell. After approximately 400,000 years the wind pressure on the shell has decreased so much that the shell structure of the H II region almost disappears.
E. L. Logvinenko, Yu. A. Shchekinov
openaire   +1 more source

The H II regions of Holmberg II

Publications of the Astronomical Society of the Pacific, 1994
Calibrated H-alpha and continuum CCD frames are used to measure the emission-line luminosities and mophological characteristics of 82 H II regions in the dwarf irregular galaxy, Ho II, in the M81 group. The assemblage of H II regions is statistically normal: the luminosity function fits a power law with -1.70 and the size distribution is roughly ...
Paul Hodge   +2 more
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