Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars
Recent ultraviolet observations point out that there is hot, dense plasma associated with the optical jet in some T Tauri stars. In this contribution, cool MHD disk wind physics is reviewed by means of a self-similar analytical model to analyze whether hot (Te ≃ 80,000 K) and dense (ne ≃ 109 cm-3) p...
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0004640X_v287_n1-4_p31_GomezDeCastro |
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todo:paper_0004640X_v287_n1-4_p31_GomezDeCastro2023-10-03T14:02:58Z Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars Gómez De Castro, A.I. Ferro-Fontán, C. Recent ultraviolet observations point out that there is hot, dense plasma associated with the optical jet in some T Tauri stars. In this contribution, cool MHD disk wind physics is reviewed by means of a self-similar analytical model to analyze whether hot (Te ≃ 80,000 K) and dense (ne ≃ 109 cm-3) plasma can be produced in disk winds. It is shown that these high densities can only be achieved at the base of the wind where the stellar X-rays radiation field is strong. The propagation of the X-rays radiation through the disk wind is analyzed: a cocoon of photoionized gas is generated around the star. However, it is difficult to foresee how temperatures as high as ∼ 5 × 104 can be reached unless a significant fraction of the X-rays radiation is produced by magnetic reconnection at the boundary between the stellar magnetosphere and the accretion disk. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004640X_v287_n1-4_p31_GomezDeCastro |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
Recent ultraviolet observations point out that there is hot, dense plasma associated with the optical jet in some T Tauri stars. In this contribution, cool MHD disk wind physics is reviewed by means of a self-similar analytical model to analyze whether hot (Te ≃ 80,000 K) and dense (ne ≃ 109 cm-3) plasma can be produced in disk winds. It is shown that these high densities can only be achieved at the base of the wind where the stellar X-rays radiation field is strong. The propagation of the X-rays radiation through the disk wind is analyzed: a cocoon of photoionized gas is generated around the star. However, it is difficult to foresee how temperatures as high as ∼ 5 × 104 can be reached unless a significant fraction of the X-rays radiation is produced by magnetic reconnection at the boundary between the stellar magnetosphere and the accretion disk. |
| format |
JOUR |
| author |
Gómez De Castro, A.I. Ferro-Fontán, C. |
| spellingShingle |
Gómez De Castro, A.I. Ferro-Fontán, C. Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars |
| author_facet |
Gómez De Castro, A.I. Ferro-Fontán, C. |
| author_sort |
Gómez De Castro, A.I. |
| title |
Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars |
| title_short |
Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars |
| title_full |
Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars |
| title_fullStr |
Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars |
| title_full_unstemmed |
Photoionization of cool MHD disk winds: On the source of the far UV emission lines from T Tauri stars |
| title_sort |
photoionization of cool mhd disk winds: on the source of the far uv emission lines from t tauri stars |
| url |
http://hdl.handle.net/20.500.12110/paper_0004640X_v287_n1-4_p31_GomezDeCastro |
| work_keys_str_mv |
AT gomezdecastroai photoionizationofcoolmhddiskwindsonthesourceofthefaruvemissionlinesfromttauristars AT ferrofontanc photoionizationofcoolmhddiskwindsonthesourceofthefaruvemissionlinesfromttauristars |
| _version_ |
1782029828126408704 |