density-bounded H II region — An Etymological Dictionary of Astronomy and Astrophysics

density-bounded H II region

ناحیه‌ی ِ H IIی ِ چگالی‌کرانمند

nâhiye-ye H II-ye cagâli karânmand

Fr.: bornée par la densité

An → H II region which lacks enough matter to absorb all → Lyman continuum photons of the → exciting star(s). In such an H II region a part of the ionizing photons escape into the → interstellar medium. See also → ionization-bounded H II region.

See also: → density; → bounded; → region.

An Etymological Dictionary of Astronomy and Astrophysics