000002087 001__ 2087
000002087 005__ 20160706150639.0
000002087 0247_ $$2DOI$$a10.1051/0004-6361/201527667
000002087 037__ $$aASTROimport-244
000002087 100__ $$aVamvatira-Nakou, C.
000002087 245__ $$aHerschel observations of the nebula M1-67 around the Wolf-Rayet star WR 124
000002087 260__ $$c2016
000002087 520__ $$aInfrared Herschel imaging and spectroscopic observations of the nebula M1-67 around the Wolf-Rayet star WR 124 have been obtained along with optical imaging observations. The infrared images reveal a clumpy dusty nebula that extends up to 1 pc. The comparison with the optical images shows that the ionized gas nebula coincides with the dust nebula, the dust and the gas being mixed together. A photodissociation region is revealed from the infrared spectroscopic analysis. The analysis of the infrared spectrum of the nebula, where forbidden emission lines of ionized elements were detected, showed that the nebula consists of mildly processed material with the calculated abundance number ratios being N/O = 1.0 ± 0.5 and C/O = 0.46 ± 0.27. Based on a radiative transfer model, the dust mass of the nebula was estimated to be 0.22 M? with a population of large grains being necessary to reproduce the observations. The comparison of the mass-loss rate and the abundance ratios to theoretical models of stellar evolution led to the conclusion that the nebular ejection took place during a RSG/YSG evolutionary phase of a central star with an initial mass of 32 M?. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Based in part on observations collected at the European Southern Observatory, La Silla, Chile.
000002087 700__ $$aHutsemékers, D.
000002087 700__ $$aRoyer, P.
000002087 700__ $$aWaelkens, C.
000002087 700__ $$aGroenewegen, M. A. T.
000002087 700__ $$aBarlow, M. J.
000002087 773__ $$cA92$$pAstronomy and Astrophysics$$v588$$y2016
000002087 85642 $$ahttp://esoads.eso.org/abs/2016A%26A...588A..92V
000002087 905__ $$apublished in
000002087 980__ $$aREFERD