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

F.M. Jim'enez-Esteban, J.R. Rizzo, A. Palau

Centro de Astrobiolog'{i}a, Spain
Institut de Ciences de l'Espai, Spain

Aiming 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 30 m radio telescope and 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 CO$_2$ 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.

Reference: Published in ApJ, 713, p. 429 (2010)
Status: Manuscript has been accepted

Weblink: astro-ph/1003.4455