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Producción explosiva de litio en la clásica nova V339 Del (Nova Delphini 2013) donde se encuentra el explosivo

Akito Tajitsu¹, Kozo Sadakane², Hiroyuki Naito³

¹Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, Hawaii 96720, USA.

|February 20, 2015

Resumen

Los científicos detectaron berilio-7 (7Be) en una nova, que se descompone en litio-7 (7Li). Esto proporciona evidencia directa de que las novas producen cantidades significativas de litio, una pregunta de larga data en astrofísica.

Área de la Ciencia:

* Astrofísica es la astrofísica.
* La astrofísica nuclear es una astrofísica.
* Evolución estelar de las estrellas.

Sus antecedentes:

* El origen del litio (Li) y sus mecanismos de producción siguen siendo inciertos.
* Los modelos existentes sugieren contribuciones de la nucleosíntesis del Big Bang, los rayos cósmicos, las estrellas evolucionadas, las novas y las supernovas.
* Investigaciones anteriores indicaron una producción significativa de litio en gigantes rojas, estrellas de rama gigante asintótica (AGB) y novas, pero la evidencia observacional directa faltaba.

Objetivo del estudio:

* Investigar la producción de litio en las explosiones clásicas de nova.
* Proporcionar evidencia observacional directa para el suministro de litio de objetos estelares al medio interestelar.

Principales métodos:

* Análisis espectral de la clásica nova V339 Delphini (Nova Delphini 2013) utilizando observaciones en el ultravioleta cercano.
* Detección de líneas de resonancia muy desplazadas hacia el azul del isótopo radiactivo berilio-7 (7Be).

Principales resultados:

* Detección de berilio-7 (7Be) ionizado individualmente en el espectro de Nova Delphini 2013, 38 a 48 días después de la explosión.
* El berilio-7 (7Be) se formó a través de la reacción de captura alfa (3He(α,γ) 7Be) durante el estallido de la nova.
* El berilio-7 (7Be) se descompone en litio-7 (7Li) con una vida media de 53,22 días.

Conclusiones:

* La detección de 7Be en una nova clásica proporciona evidencia directa de la producción de litio en estos eventos.
* Este hallazgo apoya las predicciones teóricas de que las novas son una fuente significativa de litio galáctico.
* El estudio aborda una pregunta clave en la nucleosíntesis estelar y la evolución química.

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