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Dinámica estelar La dinámica estelar es la dinámica estelar. La estrella libre más rápida de nuestra galaxia fue

S Geier¹, F Fürst², E Ziegerer³

¹European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany. Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstraße 7, 96049 Bamberg, Germany. sgeier@eso.org.

Science (New York, N.Y.)

|March 7, 2015

Resumen

La estrella libre más rápida de nuestra galaxia, US 708, viaja a unos 1200 km/s. El análisis sugiere que se originó en un sistema binario, no en el centro galáctico, probablemente como remanente de un donante de supernova.

Área de la Ciencia:

* Astronomía y Astrofísica.
* Evolución estelar de las estrellas.
* Dinámica Galáctica es la Dinámica Galáctica.

Sus antecedentes:

* Las estrellas hiperveloces (HVS) poseen velocidades que exceden la velocidad de escape galáctico.
* Se cree que la mayoría de los HVS se originan en el centro galáctico.
* US 708 es la única estrella de helio compacta conocida HVS.

Objetivo del estudio:

* Para realizar un detallado análisis espectroscópico y cinemático de la estrella de hipervelocidad US 708.
* Para investigar el origen y el mecanismo de eyección de US 708.
* Para entender la trayectoria evolutiva de US 708.

Principales métodos:

* Análisis espectroscópico para determinar las propiedades estelares.
* Análisis cinemático para reconstruir la trayectoria de la estrella.
* Modelado de la evolución binaria para probar escenarios de formación.

Principales resultados:

* US 708 exhibe una velocidad de aproximadamente 1200 km/s, lo que la convierte en la estrella libre más rápida descubierta.
* La reconstrucción de la trayectoria indica que el centro galáctico es un origen poco probable.
* US 708 se identifica como una estrella de rotación rápida.

Conclusiones:

* Las características del US 708 son inconsistentes con los típicos mecanismos de eyección HVS.
* La rotación de la estrella sugiere que la rotación se produce a través de la interacción de las mareas en un sistema binario.
* US 708 es probablemente la estrella donante expulsada de un evento de supernova termonuclear.

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