Bibcode
Santander-García, M.; Corradi, R. L. M.; Mampaso, A.; Morisset, C.; Munari, U.; Schirmer, M.; Balick, B.; Livio, M.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 485, Issue 1, 2008, pp.117-126
Fecha de publicación:
7
2008
Revista
Número de citas
29
Número de citas referidas
27
Descripción
Aims: The kinematics, shaping, density distribution, expansion distance,
and ionized mass of the nebula Hen 2-104, and the nature of its
symbiotic Mira are investigated. Methods: A combination of
multi-epoch HST images and VLT integral field high-resolution
spectroscopy is used to study the nebular dynamics both along the line
of sight and in the plane of the sky. These observations enable a 3-D
spatio-kinematical model of the nebula to be constructed, which, with
the measurement of its apparent expansion in the plane of the sky over a
period of 4 years, provides the expansion parallax for the nebula. The
integral-field data featuring the [Sii] λλ671.7, 673.1
emission line doublet provide a density map of the inner lobes of the
nebula, which with the distance estimation provide a measurement of its
ionized mass. Results: We measure densities ranging from n_e=500
to 1000 cm-3 in the inner lobes, and from 300 to 500
cm-3 in the outer lobes. We determine an expansion-parallax
distance of 3.3 ± 0.9 kpc to Hen 2-104, which implies an
unexpectedly large ionized mass for the nebula of approximately one
tenth of a solar mass.
Based on observations with the NASA/ESA Hubble Space Telescope, obtained
at the Space Telescope Science Institute, which is operated by the
Association of Universities for Research in Astronomy, Inc. under NASA
contract No. NAS5-26555; and on observations obtained at the 4 m NTT and
the 8 m VLT telescopes of the European Southern Observatory in Chile.
Proyectos relacionados
![Imagen con el Telescopio Espacial (HST) de la Nebulosa Planetaria "Necklace" ("el collar de perlas") descubierta por nuestro grupo en 2005 usando el Telescopio Isaac Newton (INT) en el Observatorio del Roque de los Muchachos (proyecto IPHAS de cartografiado en H-alfa del Plano Galáctico). Esta Planetaria se ha convertido en una pieza clave para entender la formación de nebulosas bipolares en sistemas con estrellas progenitoras binarias (Corradi+2011). Nebulosa Planetaria "Necklace"](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/Imagen%20AMR.jpg?itok=S55dQ216)
Nebulosas Bipolares
Nuestro proyecto persigue tres objetivos principales: 1) Determinar las condiciones físico-químicas de las nebulosas planetarias con geometría bipolar y de las nebulosas alrededor de estrellas simbióticas. El fin es entender el origen de la bipolaridad y poner a prueba los modelos teóricos que intentan explicar la morfología y la cinemática nebular
Antonio
Mampaso Recio