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Multiple shells around G79.29+0.46 revealed from near-IR to millimeter data

AuthorsJiménez-Esteban, Francisco M. ; Rizzo, José Ricardo ; Palau, Aina
KeywordsCircumstellar matter
Dust, extinction
ISM: individual objects (G79.29+0.46)
ISM: lines and bands
Stars: evolution
Stars: mass-loss
Issue DateApr-2010
PublisherAmerican Astronomical Society
CitationAstrophysical Journal 713 (1) : 429 (2010)
AbstractAiming to perform a study of the warm dust and gas in the luminous blue variable star G79.29+0.46 and its associated nebula, we present infrared Spitzer imaging and spectroscopy, and new CO J=2-->1 and 4-->3 maps obtained with the IRAM 30m radio telescope and with the Submillimeter Telescope, respectively. We have analyzed the nebula detecting multiple shells of dust and gas connected to the star. Using Infrared Spectrograph-Spitzer spectra, we have compared the properties of the central object, the nebula, and their surroundings. These spectra show a rich variety of solid-state features (amorphous silicates, polycyclic aromatic hydrocarbons, and CO2 ices) and narrow emission lines, superimposed on a thermal continuum. We have also analyzed the physical conditions of the nebula, which point to the existence of a photo-dissociation region.
DescriptionPublicado en línea el 22 de marzo de 2010.
Publisher version (URL)http://dx.doi.org/10.1088/0004-637X/713/1/429
Appears in Collections:(ICE) Artículos
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