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Una nebulosa bipolar simétrica alrededor de MWC 9222
1Physics Department, University of Sydney, NSW 2006, Australia. p.tuthill@physics.usyd.edu.au
Science (New York, N.Y.)
|April 14, 2007
Resumen
Las imágenes infrarrojas revelan una estructura regular y simétrica alrededor de la estrella Be envuelta en polvo MWC 922, formando una nebulosa "Cuadrado Rojo". Esta estructura, con sus características distintas, sugiere una interrupción mínima de los efectos caóticos.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Evolución Estelar Evolución Estelar
- Física de las nebulosas Física de las nebulosas
Sus antecedentes:
- Las estrellas B son estrellas de tipo B que giran rápidamente con discos circumestelares.
- Las estrellas cubiertas de polvo presentan desafíos para el análisis estructural detallado.
- MWC 922 es una peculiar estrella Be con una inusual nebulosa circundante.
Objetivo del estudio:
- Para investigar la estructura detallada de la nebulosa que rodea a la estrella Bé MWC 922.
- Para analizar la morfología y simetría del objeto cubierto de polvo.
- Comprender los mecanismos de formación de las estructuras observadas.
Principales métodos:
- Imágenes infrarrojas de MWC 922.
- Análisis morfológico de la estructura de la nebulosa.
- Comparación con fenómenos astrofísicos conocidos.
Principales resultados:
- Descubrimiento de una estructura muy regular y simétrica alrededor de MWC 922, apodada la nebulosa "Cuadrado Rojo".
- Observación de lóbulos bicónicos con aspectos casi cuadrados, cruzados por escalones y terminando en nudos brillantes.
- Identificación de una banda oscura ecuatorial que forma arcos hiperbólicos gemelos y una estructura de peine lineal.
- Se observaron anillos polares anidados, comparables al sistema alrededor de la supernova 1987A.
Conclusiones:
- Las estructuras intrincadas y bien definidas sugieren una mínima influencia turbulenta o caótica global.
- La estructura del peine lineal puede indicar características periódicas dentro del disco circumestelar interno.
- La morfología observada proporciona información sobre las últimas etapas de la evolución de las estrellas y los procesos de eyección de masa.
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