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Dos secuencias distintas de estrellas rezagadas azules en el cúmulo globular M 30 30

F R Ferraro¹, G Beccari, E Dalessandro

¹Department of Astronomy, University of Bologna, Via Ranzani 1, 40127 Bologna, Italy. francesco.ferraro3@unibo.it

|December 25, 2009

Resumen

Dos distintas poblaciones de estrellas rezagadas azules en el cúmulo globular M 30 sugieren diferentes vías de formación. El colapso del núcleo probablemente mejoró tanto las colisiones estelares como la transferencia de masa binaria, creando dos secuencias únicas de rezagados azules.

Área de la Ciencia:

La astrofísica es la astrofísica.
Evolución Estelar Evolución Estelar
La astronomía galáctica es la astronomía galáctica.

Sus antecedentes:

Los cúmulos globulares suelen albergar estrellas de edad uniforme.
Los rezagados azules son estrellas anómalas que desafían las líneas de tiempo de evolución estelar esperadas.
Se propusieron dos mecanismos de formación primaria: transferencia de masa binaria y colisiones estelares.

Objetivo del estudio:

Investigar los mecanismos de formación de las estrellas rezagadas azules.
Analizar las distintas poblaciones de rezagados azules observadas en el cúmulo globular M30.
Determinar el impacto del colapso del núcleo en la formación de rezagados azules.

Principales métodos:

Análisis fotométrico de las estrellas en el cúmulo globular M30.
Identificación y caracterización de distintas secuencias de rezagados azules.
Modelación de la evolución estelar y las interacciones binarias dentro de un entorno de cúmulo de núcleo colapsado.

Principales resultados:

Se identificaron dos secuencias distintas y paralelas de rezagados azules en M30.
La secuencia más azul se atribuye a colisiones estelares directas.
La secuencia redder está vinculada a la transferencia de masa dentro de los sistemas binarios, probablemente en curso.

Conclusiones:

Las poblaciones de rezagados azules observadas en M 30 son el resultado del colapso del núcleo del cúmulo.
El colapso del núcleo aumenta simultáneamente las tasas de colisión estelar y la actividad de transferencia de masa binaria.
Esta doble mejora explica la presencia de dos secuencias distintas de rezagados azules.

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