MULTIPLE SHELLS AROUND G79.29+0.46 REVEALED FROM NEAR-IR TO MILLIMETER DATA

作者：Jimenez Esteban F M; Rizzo J R; Palau Aina

来源：Astrophysical Journal, 2010, 713(1): 429-439.

DOI：10.1088/0004-637X/713/1/429

• circumstellar matter
• dust, extinction
• ISM: individual objects (G79.29+0.46)
• ISM: lines and bands
• stars: evolution
• stars: mass-loss

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.

• 出版日期2010-4-10