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La formación de un sistema estelar cuádruple con una amplia separación
Jaime E Pineda1, Stella S R Offner2, Richard J Parker3
1Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland.
Nature
|February 13, 2015
Resumen
La fragmentación del filamento puede crear sistemas estelares cuádruples de amplia separación. Las observaciones revelan condensaciones densas de gas que forman estrellas, lo que sugiere que esta es una vía viable para los orígenes de sistemas estelares múltiples.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Formación Estelar Formación Estelar
Sus antecedentes:
- El número inicial de estrellas en un sistema estelar (multiplicidad) es incierto.
- Los mecanismos propuestos para la formación de sistemas estelares múltiples incluyen la fragmentación del núcleo, la fragmentación del disco y la captura estelar.
- Una mayor multiplicidad en estrellas jóvenes sugiere que las primeras interacciones dinámicas modifican los sistemas.
Objetivo del estudio:
- Para investigar la multiplicidad inicial de los sistemas estelares.
- Para determinar el mecanismo de formación binario dominante.
- Para observar un sistema estelar múltiple en formación directamente.
Principales métodos:
- Observación de alta resolución de un sistema cuádruple de amplia separación.
- Análisis de una joven protoestrella con tres densas condensaciones de gas unidas gravitacionalmente.
- Evaluación de la fragmentación y la estabilidad del sistema.
Principales resultados:
- Observó un sistema cuádruple con una joven protoestrella y tres condensaciones de gas unidas.
- Las condensaciones se formaron a través de la fragmentación de filamentos, cada una de las cuales se espera que forme una estrella en 40.000 años.
- El sistema está limitado pero inestable en escalas de tiempo de 500.000 años.
Conclusiones:
- Fragmentación del filamento en escalas grandes (aprox. 5.000 UA) es una vía viable para la formación de sistemas múltiples.
- Las primeras interacciones dinámicas probablemente juegan un papel en la configuración de la multiplicidad del sistema estelar.
- La observación directa de los sistemas de formación es crucial para comprender los mecanismos de formación binaria.
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