Calibración de Luminosidad

 


Líneas de investigación

Calibración de la luminosidad con el método de máxima verosimilitud

La determinación de la calibración de luminosidad para una población estelar de una muestra limitada de estrellas está siempre afectada por un sesgo. Método de máxima verosimilitud permite modelar el proceso de selección de la muestra para obtener una calibración de luminosidad para dicha población sin sesgo. Además, el  método tiene en cuenta toda la información disponible (por ejemplo, en el caso de la calibración de la luminosidad, no sólo la paralaxi, sino también el movimiento propio), de tal manera que la incertidumbre final se reduce.

A partir del trabajo de X.Luri (1996) nuestro equipo ha aplicado estos métodos con diferentes propósitos, como el estudio de la relación periodo luminosidad de estrellas Cefeidas (Luri, 1998), la caracterización de poblaciones estelares en nuestra Galáxia (Masana et al. 2000) o, más recientemente, el estudio de cúmulos abiertos (Palmer et al., in press).

Binarias eclipsantes como laboratorios para determinar la distancia estelar

Hemos colaborado con un proyecto destinado a determinar la primera distancia directa a la galáxia Andrómeda (M31) a partir de estrellas binarias eclipsantes. Un estudio fotométrico se llevó a cabo en la parte Oriental de M31, proporcionando curvas de luz de casi 4000 estrellas variables, con más de 400 binarias eclipsantes y 400 cefeidas. Después de una selección preliminar, se eligieran cuatro binarias eclipsantes para el seguimiento espectroscopio con el telescopio Gemini-North. El análisis realizado reveló las propiedades fundamentales de varias estrellas masivas. Dos de estas binarias eclipsantes se utilizaron para determinar la primera distancia directa a M31 de (m-M)0=24.36±0.08 mag, con un error de tan sólo un 4% (veáse Vilardell et al., 2010; Vilardell, 2009 PhD thesis). El estudio también produjo probablemente la detección de la estrella más masiva en una binaria eclipsante con movimiento apsidal, que se encuentra bajo estudio.

La explotación del Simulador de Gaia: La escala de distancias

Los datos generados por el Simulador de Gaia, en particular la simulación el “Simulación del modelo de Universo Gaia (GUMS)”, permite estimar algunos resultados finales de la misión Gaia. En particular, se han analizado las expectativas de Gaia para la derivación de la escala de distancias a partir de los datos de las galáxias SMC y LMC. El trabajo se presentó en la reunión “The Fundamental Distance Scale: state of the art and the Gaia perspectives” (Nápoles, Italia, 2011) y fue publicado en Turon et al., 2012.

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