JHKLM photometry and light curves of V Cyg

The determination of outflow parameters is often hindered by the unknown geometry of the circumstellar environment, creating a demand for high-angular resolution observations. We use our near-infrared spectra and photometry of the carbon AGB star V Cyg, along with literature data, to construct its spectral energy distribution over a wide range of wavelengths.

The dust envelope responsible for the infrared excess was also resolved in scattered polarized light at angular scales of 50-80mas using differential speckle polarimetry. We present an interpretation of the thermal and scattered radiation of the dust using models of a spherical dusty outflow (M_dust_=5.3e-7M_{sun}_) and an inclined equatorial density enhancement, either in the form of a disk (M_dust_=7.6e-3M_{Earth}_) or a torus (M_dust_=5.7e-3M_{Earth}_), which material is concentrated at stellocentric distances less than 25AU.