Sh2-124 (Joan Josep Isach)

Sh2-124

Sh2-124 es una gran nebulosa de emisión visible en la constelación Cygnus .

Se encuentra en el borde noroeste de la constelación, a lo largo de la Vía Láctea , al este del par de estrellas ρ 1 Cygni y ρ 2 Cygni ; el período más propicio para su observación en el cielo vespertino cae entre los meses de julio y diciembre y se facilita considerablemente para los observadores ubicados en las regiones del hemisferio norte terrestre .

Sh2-124 es un extenso y enigmático sistema nebuloso, vinculado a la fuente infrarroja RAFGL 2789, que se identifica con la contraparte estelar conocida como V645 Cygni, probablemente una estrella de clase O o estrella Ae/Be de Herbig . El complejo probablemente se encuentra dentro del Brazo de Orión a una distancia de unos 2600 parsecs (unos 8480 años luz ); Aunque esta es la estimación de distancia más aceptada, se han propuesto distancias de hasta 4500 parsecs. Si la estimación de 2600 parsec es correcta, esta nebulosa podría estar ubicada en una región entre brazos o cerca del borde interior del Brazo de Perseo., en primer plano con respecto a la asociación Cepheus OB1.

Las principales estrellas responsables de la ionización de los gases de la nebulosa serían una estrella azul de clase espectral O7V y una estrella azul de clase B2V, a las que quizás se podrían añadir otras. La nebulosa alberga procesos de formación estelar y, de hecho, está incluida en el Catálogo Avedisova como número de objeto 1220; En su interior se han identificado algunas fuentes infrarrojas, cinco de las cuales han sido identificadas por el satélite IRAS . También se detectaron dos másers , uno con emisiones de H2O centrado en el componente V645 Cygni y otro con emisiones de CH3OH .

ZWO ASI1600MM/QHY163M

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