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We present a multiwavelength analysis of the nebula around the candidateluminous blue variable G79.29+0.46. The study is based on our radioobservations performed at the Expanded Very Large Array and at the Green BankTelescope and on archival infrared datasets, including recent images obtainedby the Herschel Space Observatory. We confirm that the radio central object ischaracterized by a stellar wind and derive a current mass-loss rate of about1.4x10-6 Msun yr-1. We find the presence of a dusty compact envelope close tothe star, with a temperature between 40 and 1200 K. We estimate for the outerejecta an ionised gas mass of 1.51 Msun and a warm (60--85 K) dust mass of 0.02Msun. Diagnostics of the far-infrared spectra indicate the presence of aphoto-dissociation region around the ionised gas. Finally, we model the nebulawith the photo-ionization code CLOUDY, using as input parameters thoseestimated from our analysis. We find for the central star a luminosity of10^5.4 Lsun and an effective temperature of 20.4 kK.

The candidate luminous blue variable G79.29+0.46: a comprehensive study of its ejecta through a multiwavelength analysis