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La exclusión de un rango significativo de edades en un cúmulo estelar masivo

Chengyuan Li¹, Richard de Grijs², Licai Deng³

¹1] Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, China [2] Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, China [3] Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China.

|December 19, 2014

Resumen

Las regiones extendidas de desactivación de la secuencia principal en cúmulos estelares masivos pueden no indicar diferencias de edad. Las estrellas que giran rápidamente ofrecen una explicación plausible para estas características, desafiando las interpretaciones anteriores de las poblaciones estelares.

Área de la Ciencia:

La astronomía y la astrofísica.
Evolución estelar de la evolución estelar.
Dinámica de los cúmulos estelares Dinámica de los cúmulos estelares

Sus antecedentes:

Los cúmulos estelares masivos de edad intermedia a menudo exhiben regiones extendidas de desactivación de la secuencia principal (eMSTO).
Los eMSTO suelen interpretarse como evidencia de diferencias de edad internas significativas (cientos de millones de años).
Se cree que los cúmulos jóvenes expulsan rápidamente el combustible de formación estelar, limitando las dispersiones de edad.

Objetivo del estudio:

Para investigar la causa de las eMSTO en cúmulos estelares de edad intermedia.
Para determinar si las eMSTO implican necesariamente dispersiones de edad internas.
Explorar explicaciones alternativas para la morfología del eMSTO.

Principales métodos:

Observaciones de imágenes de alta resolución del cúmulo estelar NGC 1651.
Modelado teórico de las poblaciones estelares.
Análisis de los diagramas de Hertzsprung-Russell para cúmulos estelares múltiples.

Principales resultados:

El eMSTO en el cúmulo de dos mil millones de años de antigüedad NGC 1651 (1.7 × 10^5 masas solares) es consistente con una población estelar de una sola edad.
Las estrellas que giran rápidamente se proponen como la explicación más plausible para el observado eMSTO.
Morfologías similares de eMSTO se observan en al menos otros cinco cúmulos estelares de edad intermedia.

Conclusiones:

Las regiones extendidas de desactivación de la secuencia principal no necesariamente indican dispersiones de edad internas significativas en cúmulos estelares.
Las estrellas que giran rápidamente pueden ser un fenómeno común que contribuye a las eMSTO.
Se necesita más investigación para comprender plenamente las implicaciones de las estrellas que giran rápidamente en las vidas estelares y la evolución de los cúmulos.

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