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H II region age indicators

dc.contributor.authorCopetti, Marcus Vinicius Fontanapt_BR
dc.contributor.authorPastoriza, Miriani Griseldapt_BR
dc.contributor.authorDottori, Horacio Albertopt_BR
dc.date.accessioned2014-07-22T02:03:36Zpt_BR
dc.date.issued1986pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98358pt_BR
dc.description.abstractThe 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.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and astrophysics. Berlin. Vol. 156, no. 1/2 (Feb. 1986), p. 111-120pt_BR
dc.rightsOpen Accessen
dc.subjectH II regionsen
dc.subjectAstrofisica extragalaticapt_BR
dc.subjectRegiões HIIpt_BR
dc.subjectEvolution modelsen
dc.subjectAge determinationen
dc.subjectIonizaçãopt_BR
dc.titleH II region age indicatorspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000112961pt_BR
dc.type.originEstrangeiropt_BR


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