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La desalineación del giro y los ejes orbitales causan la precesión anómala de DI Herculis
Simon Albrecht1, Sabine Reffert, Ignas A G Snellen
1Leiden Observatory, Leiden University, Postbus 9513, 2300 RA Leiden, The Netherlands. albrecht@space.mit.edu
Nature
|September 18, 2009
Resumen
El DI Hércules es un sistema estelar binario.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- La Dinámica Orbital es una Dinámica Orbital.
- Evolución Estelar Evolución Estelar
Sus antecedentes:
- Las órbitas de las estrellas binarias exhiben precesión debido a la relatividad general y las propiedades estelares.
- El sistema DI Herculis muestra una discrepancia significativa entre las tasas de precesión observadas y teóricas.
- Esta discrepancia ha desafiado históricamente nuestra comprensión de la física gravitacional.
Objetivo del estudio:
- Para resolver el misterio de 30 años de la tasa de precesión anómala en el sistema binario DI Hercules.
- Para investigar el papel de la orientación del eje de giro estelar en la dinámica orbital de las estrellas binarias.
- Para conciliar las predicciones teóricas con los datos de observación para DI Herculis.
Principales métodos:
- Análisis de los datos de observación para el sistema DI Herculis.
- Modelado teórico de la precesión orbital que incorpora la rotación estelar y la oblicuidad.
- Comparación de las tasas de precesión pronosticadas con los valores observados.
Principales resultados:
- Ambas estrellas en DI Herculis poseen ejes de giro casi perpendiculares a su eje orbital.
- Esta alta oblicuidad conduce a la flatitud estelar inducida por la rotación.
- La flatitud genera una precesión que contrarresta los efectos relativistas, explicando la tasa más lenta observada.
Conclusiones:
- La precesión anómala de DI Herculis se explica por la orientación perpendicular de los ejes de giro estelar.
- Este hallazgo reconcilia la relatividad general con las observaciones en este sistema binario.
- El estudio pone de relieve la importancia de la rotación estelar en la dinámica orbital binaria.
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