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La morfología cambiante y la creciente desaceleración de la supernova 1993J en M81
1Department of Physics and Astronomy, York University, Toronto M3J 1P3, Ontario, Canada. National Radio Astronomy Observatory, Socorro, NM 87801, USA. Max-Planck-Institut fur Radioastronomie, D-53121 Bonn, Germany. Jet Propulsion Laboratory, Cali.
Science (New York, N.Y.)
|December 30, 1999
Resumen
Supernova 1993J fue un éxito.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- La astronomía observacional es la astronomía de las observaciones.
Sus antecedentes:
- Las supernovas son poderosas explosiones estelares.
- Comprender los restos de supernovas proporciona información sobre la evolución estelar y el medio interestelar.
Objetivo del estudio:
- Para analizar dinámicamente la capa de radio en expansión de la supernova 1993J.
- Para investigar las características de expansión y las interacciones del medio circundante de un remanente de supernova.
Principales métodos:
- Se utilizaron veinte imágenes consecutivas de interferometría de línea de base muy larga (VLBI).
- Aplicó astrometría de alta precisión para rastrear la expansión de la supernova.
Principales resultados:
- Supernova 1993J exhibe expansión isotrópica desde su centro de explosión.
- La velocidad de expansión de la supernova se ha reducido a la mitad en 5 años debido a la interacción con el material circundante.
- Los cambios sistemáticos de imagen observados sugieren anisotropías en el material sobrante del progenitor.
Conclusiones:
- El remanente de la supernova 1993J está evolucionando y desacelerando dinámicamente.
- El remanente puede estar entrando en la fase adiabática, típica de los restos de supernovas más antiguas.
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