H II region age indicators

Copetti, Marcus Vinicius Fontana; Pastoriza, Miriani Griselda; Dottori, Horacio Alberto

dc.contributor.author	Copetti, Marcus Vinicius Fontana	pt_BR
dc.contributor.author	Pastoriza, Miriani Griselda	pt_BR
dc.contributor.author	Dottori, Horacio Alberto	pt_BR
dc.date.accessioned	2014-07-22T02:03:36Z	pt_BR
dc.date.issued	1986	pt_BR
dc.identifier.issn	0004-6361	pt_BR
dc.identifier.uri	http://hdl.handle.net/10183/98358	pt_BR
dc.description.abstract	The evolution of some properties of H II regions such as the relative volume R of the He⁺ and H⁺ zones, the equivalent width Wнβ 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 IMF (1 ≤ x ≤ 3) and upper stellar mass limits (30 ≤ Mu/Mѳ ≤ 120); different chemical composition models of stellar evolution with and without mass loss. It was found that Wнβ, R and [OIII]/Hβ decrease monotonically as a function of time and consequently they are good H II region age indicators.	en
dc.format.mimetype	application/pdf	pt_BR
dc.language.iso	eng	pt_BR
dc.relation.ispartof	Astronomy and astrophysics. Berlin. Vol. 156, no. 1/2 (Feb. 1986), p. 111-120	pt_BR
dc.rights	Open Access	en
dc.subject	H II regions	en
dc.subject	Astrofisica extragalatica	pt_BR
dc.subject	Regiões HII	pt_BR
dc.subject	Evolution models	en
dc.subject	Age determination	en
dc.subject	Ionização	pt_BR
dc.title	H II region age indicators	pt_BR
dc.type	Artigo de periódico	pt_BR
dc.identifier.nrb	000112961	pt_BR
dc.type.origin	Estrangeiro	pt_BR

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