H II region age indicators

Details H II region age indicators H II region age indicators

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156..111c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 111-120. FINEP-CNPq-supported research.

Astronomy and Astrophysics

Astrophysics

84

H Ii Regions, Hot Stars, Stellar Evolution, B Stars, H Beta Line, O Stars

Scientific paper

The evolution of some properties of H II regions such as the relative volume R of the He+ and H+ zones, the equivalent width WHβ of the Hβ emission line and the ratio [O III]/Hβ of the lines [O II] λλ4959, 5007 to Hβ, was studied through models which take into account: a single burst for the formation of the ionizing association with different initial mass function (1 ≤ χ ≤ 3) and upper stellar mass limits (30 ≤ Mu/M_sun; ≤ 120); different chemical composition models of stellar evolution with and without mass loss. It was found that WHβ, R and [O III]/Hβ decrease monotonically as a function of time and consequently they are good H II region age indicators.

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