P. Ambrocio–Cruz,2,5 M. Rosado,2 A. Laval,4 E. Le Coarer,3 D. Russeil,4 and P. Amram4
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. 70–264, 04510, México, D.F., México. (patricia@astroscu.unam.mx, margarit@astroscu.unam.mx).
3 Laboratoire d'Astrophysique de Grenoble, B.P. 53 Grenoble CEDEX 9, France. (etienne.lecoarer@obs.ujf–grenoble.fr).
4 LAM, Observatoire de Marseille, 2, Place Le Verrier, 13248 Marseille CEDEX 4, France. (delphine.russeil@oamp.fr).
5 Dpto. de Física, Universidad Iberoamericana, Prol. Paseo de la Reforma 880, Lomas de Santa Fe, 01210, México, D.F., México.
Received 2007 October 30 ]]> Accepted 2008 July 22
RESUMEN
La nebulosa N119 en la Nube Mayor de Magallanes tiene una morfología muy peculiar, difícil de explicar con los modelos clásicos. El objetivo del presente artículo es proporcionar datos cinemáticos que puedan dar restricciones sobre su naturaleza, formación y evolución. La peculiar morfología espiral de esta nebulosa se ve reflejada en su campo de velocidades radiales, el cual muestra varias expansiones en los filamentos débiles, los cuales forman diferentes regiones en forma de burbujas, pero también encontramos otras componentes cuyo origen no está claro. De acuerdo con nuestros resultados, N119 parece contener 3 nebulosas en forma de burbuja formadas por los vientos estelares de estrellas O, WR y quizás un posible remanente de una explosión de hipernova. En el curso de este estudio hemos detectado por primera vez una burbuja alrededor de la estrella WR Br 21.
ABSTRACT
The nebula N119 in the Large Magellanic Cloud shows a very conspicuous morphology difficult to explain with classical models. The aim of the present paper is to provide kinematic data that could place constraints on the nature, formation and evolution of N119. The peculiar spiral shape of this nebula is also reflected in a peculiar radial velocity field, showing several expansions of the faint filaments which form different bubble–like regions, and another component whose origin remains unrevealed. N119 seems to contain three expanding bubble–shaped nebulae formed by the action of the stellar winds from Wolf–Rayet and O stars, and a possible remnant of an hypernova explosion. Indeed, we have detected for the first time a bubble around the WR star Br 21, inside the N119 nebula.
Key Words: H II regions — ISM: bubbles — ISM: individual (N 119) — ISM: kinematics and dynamics — ISM: supernova remnants.
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1 Based on observations done at La Silla (ESO).
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