Oxygen and helium abundances in galactic h II regions: abundance gradients
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876449698800205824 |
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| author | R. Costero |
| author_facet | R. Costero |
| contents | Oxygen and helium abundances in galactic h II regions: abundance gradients R. Costero M. Peña L. Deharveng Física, Astronomía y Matemáticas H II REGIONS ISM: ABUNDANCES GALAXY: ABUNDANCES 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 = ( 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100945 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.9 |
| format | Artículo científico |
| id | redalyc_57100945 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Oxygen and helium abundances in galactic h II regions: abundance gradients R. Costero Física, Astronomía y Matemáticas H II REGIONS ISM: ABUNDANCES GALAXY: ABUNDANCES Oxygen and helium abundances in galactic h II regions: abundance gradients R. Costero M. Peña L. Deharveng Física, Astronomía y Matemáticas H II REGIONS ISM: ABUNDANCES GALAXY: ABUNDANCES 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 = ( 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100945 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.9 |
| title | Oxygen and helium abundances in galactic h II regions: abundance gradients |
| topic | Física, Astronomía y Matemáticas H II REGIONS ISM: ABUNDANCES GALAXY: ABUNDANCES |
| url | https://www.redalyc.org/articulo.oa?id=57100945 |