Oxygen and helium abundances in galactic h II regions: abundance gradients
Absolute integrated uxes have been obtained for 34 H II regions, with Galactocentricdistances RG in the 6.6{17.7 kpc range, in the emission lines [O II] 3726and 3729, [O III] 4363 and 5007, He I 5876, H and H. These uxes are analyzedto derive the physical parameters, the ionic abundances O+/H+, O++/...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2000 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57100945 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57100945 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas H II REGIONS ISM: ABUNDANCES GALAXY: ABUNDANCES |
| Sumario: | Absolute integrated uxes have been obtained for 34 H II regions, with Galactocentricdistances RG in the 6.6{17.7 kpc range, in the emission lines [O II] 3726and 3729, [O III] 4363 and 5007, He I 5876, H and H. These uxes are analyzedto derive the physical parameters, the ionic abundances O+/H+, O++/H+and He+/H+ and the O/H abundances. Accurate electron temperatures have beenderived in six H II regions with RG between 6.6 kpc and 14.8 kpc, widening theRG range for which reliable Te measurements exist. Our O/H relationship for5 kpc < RG < 15 kpc is 12 + logO=H = ( |
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