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Vigoroso movimiento atmosférico en la estrella roja supergigante Antares

K Ohnaka¹, G Weigelt², K-H Hofmann²

¹Instituto de Astronomía, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile.

|August 18, 2017

Resumen

Los investigadores mapearon el campo de velocidad de la supergigante roja Antares, revelando grandes grupos de gas que se mueven hacia arriba y hacia abajo. Estos movimientos turbulentos en su extensa atmósfera sugieren un proceso desconocido en juego más allá de la convección.

Área de la Ciencia:

Astrofísica estelar
La astronomía
Dinámica atmosférica

Sus antecedentes:

Las supergigantes rojas son estrellas masivas con atmósferas complejas.
Estudios anteriores utilizaron la espectroscopia para sondear las atmósferas de las supergigantes rojas.
Las imágenes interferométricas han detectado puntos brillantes en estas atmósferas.

Objetivo del estudio:

Para mapear el campo de velocidad bidimensional de la supergigante roja Antares.
Para investigar la dinámica de su extensa atmósfera.
Para identificar los procesos que impulsan el movimiento atmosférico.

Principales métodos:

Imágenes de interferometría espectral en el infrarrojo cercano.
Mapeando la velocidad del gas a través de la superficie y la atmósfera de la estrella.
Analizando la dinámica atmosférica estelar.

Principales resultados:

Se observan movimientos vigorosos de flujo ascendente y descendente de las masas de gas.
Las velocidades oscilaron entre -20 y +20 km/s.
La atmósfera se extiende a aproximadamente 1,7 radios estelares.

Conclusiones:

Los movimientos turbulentos observados exceden las explicaciones por la sola convección.
Un proceso no identificado probablemente impulsa la dinámica en la atmósfera extendida.
Se necesita más investigación para comprender este fenómeno.

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