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Una distancia eclipsante-binaria a la Gran Nube de Magallanes con una precisión del dos por ciento.

G Pietrzyński¹, D Graczyk, W Gieren

¹Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile. pietrzyn@astrouw.edu.pl

|March 8, 2013

Resumen

Los astrónomos midieron con precisión la distancia a la Gran Nube de Magallanes utilizando estrellas binarias eclipsantes frías. Esto mejora la precisión de la constante de Hubble, crucial para comprender la expansión cósmica.

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Área de la Ciencia:

Cosmología Cosmología.
La astrofísica es la astrofísica.
La astronomía estelar es la astronomía estelar.

Sus antecedentes:

Determinar la constante de Hubble con precisión es esencial para la cosmología de precisión.
La incertidumbre en la constante de Hubble está actualmente limitada por la distancia a la Gran Nube de Magallanes (LMC).
Las binarias eclipsantes son herramientas valiosas para mediciones precisas de parámetros estelares y distancias.

Objetivo del estudio:

Para determinar la distancia a la Gran Nube de Magallanes (LMC) con mayor precisión.
Para proporcionar un anclaje más confiable para la escala de distancia cósmica.
Para permitir una determinación más precisa de la constante de Hubble.

Principales métodos:

Estudió ocho sistemas binarios eclipsantes de período largo y tipo tardío en el LMC compuestos de estrellas frías y gigantes.
Se midieron con precisión los tamaños tanto lineales como angulares de los componentes binarios.
Evitó las complejidades asociadas con el modelado de sistemas eclipsantes calientes y de tipo temprano.

Principales resultados:

Se obtuvo una distancia LMC de 49.97 ± 0.19 (estadística) ± 1.11 (sistemática) kiloparsecs.
Logró una precisión de distancia del 2,2 por ciento para el LMC.
Este resultado proporciona una base firme para una determinación del 3 por ciento de la constante de Hubble.

Conclusiones:

El uso de sistemas binarios eclipsantes de tipo tardío ofrece un método más preciso para la determinación de la distancia LMC.
La mejorada distancia LMC reduce significativamente una incertidumbre clave en los cálculos de la constante de Hubble.
Las perspectivas futuras indican el potencial para una precisión aún mayor (2 por ciento) en las mediciones de la constante de Hubble.