Herschel observations of the nebula M1-67 around the Wolf-Rayet star WR 124

[en] Infrared 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[SUB]⊙[/SUB] 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[SUB]⊙[/SUB]. 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Vamvatira-Nakou, C.; Institut d'Astrophysique et de Géophysique, Université de Liège, Quartier Agora, Allée du 6 août, 19C-Bât. B5c, 4000, Liège, Sart-Tilman, Belgium

Hutsemekers, Damien ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Royer, P.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, Bus 2401, 3001, Leuven, Belgium

Waelkens, C.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, Bus 2401, 3001, Leuven, Belgium

Groenewegen, M. A. T.; Koninklijke Sterrenwacht van België, Ringlaan 3, 1180, Brussels, Belgium

Barlow, M. J.; Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK)

Language :

English

Title :

Herschel observations of the nebula M1-67 around the Wolf-Rayet star WR 124

Publication date :

01 April 2016

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

588

Pages :

A92, pp.1-14

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2016A%26A...588A..92V

Available on ORBi :

since 22 April 2016

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