giant H II region — An Etymological Dictionary of Astronomy and Astrophysics

giant H II region

ناحیه‌ی ِ II H یِ غولپیکر

nahiye-ye H II-ye qulpeykar

Fr.: région H II géante

An → H II region emitting at least 10⁵⁰ → Lyman continuum photons per second, or about 10 times → Orion nebula. Such an H II region should be
powered by at least one O3V star or by at least a dozen → O-type and tens → B-type stars. Our nearest giant H II region is → NGC 3603. Some other Galactic giant H II regions are: → Lagoon Nebula, M17, W31, W51A, and NGC 3576.

See also: → giant; → H II; → region.

An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک