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Disrupción del núcleo molecular de Orión 1 por el viento de la estrella masiva Orionis C
C Pabst1, R Higgins2, J R Goicoechea3
1Leiden Observatory, Leiden University, Leiden, The Netherlands.
Nature
|January 9, 2019
Resumen
Las estrellas masivas tienen un impacto significativo en su entorno. Las observaciones muestran que los vientos estelares de θ1 Orionis C crean eficientemente una gran burbuja, interrumpiendo el núcleo molecular de Orión más de lo que se pensaba anteriormente.
Área de la Ciencia:
- La astrofísica
- Dinámica del medio interestelar
- Formación Estelar
Sus antecedentes:
- Las estrellas masivas liberan energía (mecánica y radiativa) en el medio interestelar.
- Esta energía influye en las fases de gas, calienta el medio y interrumpe las nubes moleculares, los lugares de nacimiento de las estrellas.
- Los vientos estelares, las supernovas y los fotones UV son factores clave que controlan la vida útil de las nubes moleculares.
Objetivo del estudio:
- Evaluar observacionalmente el impacto de los vientos estelares frente a la radiación en el medio interestelar.
- Para investigar la entrada de energía y la dinámica alrededor de las estrellas masivas utilizando imágenes de resolución de velocidad.
- Para cuantificar la interrupción de las nubes moleculares por la actividad de las estrellas masivas.
Principales métodos:
- Se utilizaron imágenes a gran escala con resolución de velocidad en la línea de estructura fina de carbono ionizado ([C II]).
- Se observó una región de un grado cuadrado del núcleo molecular de Orión 1 utilizando la línea [C II] a 1,9 THz (158 μm).
- Se logró una resolución de 16 segundos de arco (0,03 parsecs) para estudiar detalles finos.
Principales resultados:
- Reveló una burbuja de aproximadamente cuatro parsecs de diámetro creada por el viento estelar de θ1 Orionis C.
- Identificamos una concha de 2.600 masas solares que se expande a 13 km/s dentro de la burbuja.
- Demostró la conversión eficiente de la energía mecánica del viento estelar en la energía cinética del caparazón.
Conclusiones:
- La energía eólica estelar es altamente eficiente para impulsar la expansión de la concha y la energía cinética.
- El viento estelar de θ1 Orionis C causa una mayor interrupción en el núcleo molecular de Orión 1 que la fotoionización o las supernovas.
- Este estudio pone de relieve el papel dominante de los vientos estelares en la formación del entorno interestelar local.
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