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

Abstract

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 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.

Received by ApJ 2009 November 20, accepted for publication 2010 February 25, Published 2010 March 22

References in corpus (6)

• Discovery of a nearby twin of SN1987A's nebula around the luminous blue variable HD168625: Was Sk--69 202 an LBV?
• Spitzer IRS Observations of the Galactic Center: Shocked Gas in the Radio Arc Bubble
• Dust processing in photodissociation regions - Mid-IR emission modelling
• Mid-infrared PAH and H2 emission as a probe of physical conditions in extreme PDRs
• Discovery of warm and dense molecular gas surrounding the ring nebula G79.29+0.46
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• Spitzer/IRS investigation of MIPSGAL 24 microns compact bubbles
• Ammonia observations in the LBV nebula G79.29+0.46. Discovery of a cold ring and some warm spots
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• A Luminous Blue Variable Star Interacting with a Nearby Infrared Dark Cloud
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