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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742597.0, MPI für Astronomie / Publikationen_mpia
Stagnant shells in the vicinity of the dusty Wolf-Rayet-OB binary WR 112
Authors:Lau, R. M.; Hankins, M. J.; Schödel, R.; Sanchez-Bermudez, J.; Moffat, A. F. J.; Ressler, M. E.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal Letters
Volume:835
Issue / Number:2
Start Page:id. L31 (6 pp)
Audience:Not Specified
Abstract / Description:We present high spatial resolution mid-infrared images of the nebula around the late-type carbon-rich Wolf-Rayet (WC)-OB binary system WR 112 taken by the recently upgraded VLT spectrometer and imager for the mid-infrared (VISIR) with the PAH1, Ne ii_2, and Q3 filters. The observations reveal a morphology resembling a series of arc-like filaments and broken shells. Dust temperatures and masses are derived for each of the identified filamentary structures, which exhibit temperatures ranging from {179}-6+8 K at the exterior W2 filament to {355}-25+37 K in the central 3″. The total dust mass summed over the features is 2.6 ± 0.4 × 10-5 M. A multi-epoch analysis of mid-IR photometry of WR 112 over the past ˜20 years reveals no significant variability in the observed dust temperature and mass. The morphology of the mid-IR dust emission from WR 112 also exhibits no significant expansion from imaging data taken in 2001, 2007, and 2016, which disputes the current interpretation of the nebula as a high expansion velocity (˜1200 km s-1) “pinwheel”-shaped outflow driven by the central WC-OB colliding-wind binary. An upper limit of ≲120 km s-1 is derived for the expansion velocity assuming a distance of 4.15 kpc. The upper limit on the average total mass-loss rate from the central 3″ of WR 112 is estimated to be ≲8 × 10-6 M year-1. We leave its true nature as an open question, but propose that the WR 112 nebula may have formed in the outflow during a previous red or yellow supergiant phase of the central Wolf-Rayet star.
Free Keywords:infrared: stars; stars: individual: WR 112; stars: winds; outflows; stars: Wolf–Rayet
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X
URL:http://adsabs.harvard.edu/abs/2017ApJ...835L..31L
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