Stagnant Shells in the Vicinity of the Dusty Wolf-Rayet-OB Binary WR 112

Abstract

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, NeII\_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 $2.6\pm 0.4\times 10^{-5}$ ${\mathrm{M}}_{\odot }$. A multi-epoch analysis of mid-IR photometry of WR~112 over the past $\sim 20$ yr 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 ($\sim 1200$ km s${}^{-1}$) "pinwheel"-shaped outflow driven by the central WC-OB colliding-wind binary. An upper limit of $\lesssim 120$ 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 $\lesssim 8\times 10^{-6}$ ${\mathrm{M}}_{\odot }$ yr${}^{-1}$. 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.

arXiv comment7 pages, 3 figures, 2 tables, Accepted for publication in ApJL

References in corpus (30)

• Binary interaction dominates the evolution of massive stars
• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
• Physical Properties of Wolf-Rayet Stars
• The Infrared Astronomical Mission AKARI
• New Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
• The AKARI/IRC Mid-Infrared All-Sky Survey
• Observed Fractions of Core-Collapse Supernova Types and Initial Masses of their Single and Binary Progenitor Stars
• Stellar evolution with rotation XI: Wolf-Rayet star populations at different metallicities
• Massive Stars in the Quintuplet Cluster
• A dusty pinwheel nebula around the massive star WR 104
• The Mid-Infrared Instrument for the James Webb Space Telescope, VI: The Medium Resolution Spectrometer
• The Missing Luminous Blue Variables and the Bistability Jump
• Massive stars and the energy balance of the interstellar medium. II. The 35 solar mass star and a solution to the "missing wind problem"
• Pinwheel nebula around WR 98a
• Yellow Supergiants in the Andromeda Galaxy (M31)
• The Astrophysical Implications of Dust Formation During The Eruptions of Hot, Massive Stars
• Luminous and Variable Stars in M31 and M33. I. The Warm Hypergiants and Post-Red Supergiant Evolution
• Pinwheels in the Quintuplet Cluster
• Orbitally modulated dust formation by the WC7+O5 colliding-wind binary WR140
• First visual orbit for the prototypical colliding-wind binary WR 140
• Proper motions of new dust in the colliding-wind binary WR 140
• Massive Binary WR112 and Properties of Wolf-Rayet Dust
• Episodic mass loss in binary evolution to the Wolf-Rayet phase: Keck and HST proper motions of RY Scuti's nebula
• Luminous and Variable Stars in M31 and M33. III. The Yellow and Red Supergiants and Post-Red Supergiant Evolution
• The Keck Aperture Masking Experiment: Near-Infrared Sizes of Dusty Wolf-Rayet Stars
• Radio Properties of Pinwheel Nebulae
• WISE morphological study of Wolf-Rayet nebulae
• Recurrent dust formation by WR 48a on a 30-year timescale
• Multiwavelength Observations of NaSt1 (WR 122): Equatorial Mass Loss and X-rays from an Interacting Wolf-Rayet Binary

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