Infrared Observations of the Quintuplet Proper Members using SOFIA/FORCAST and Gemini/TReCS

Abstract

Since their discovery, the Quintuplet proper members (QPMs) have been somewhat mysterious in nature. Originally dubbed the "cocoon stars" due to their cool featureless spectra, high-resolution near-infrared imaging observations have shown that at least two of the objects exhibit "pinwheel" nebulae consistent with binary systems with a carbon-rich Wolf-Rayet star and O/B companion. In this paper, we present 19.7, 25.2, 31.5, and 37.1 $\mu$m observations of the QPMs (with an angular resolution of 3.2-3.8") taken with the Faint Object Infrared Camera for the SOFIA Telescope (FORCAST) in conjunction with high-resolution ($\sim$0.1-0.2") images at 8.8 and 11.7 $\mu$m from the Thermal-Region Camera Spectrograph (TReCS). DUSTY models of the thermal dust emission of two of the four detected QPMs, Q2 and Q3, are fitted by radial density profiles which are consistent with constant mass loss rates (${\rho }_d\propto r^{-2}$). For the two remaining sources, Q1 and Q9, extended structures ($\sim$ 1") are detected around these objects in high-resolution imaging data. Based on the fitted dust masses, Q9 has an unusually large dust reservoir (${\mathrm{M}}_{\mathrm{d}}=1.3_{-0.4}^{+0.8}\times 10^{-3}{\mathrm{M}}_{\odot }$) compared to typical dusty Wolf-Rayet stars which suggests that it may have recently undergone an episode of enhanced mass loss.

arXiv comment28 pages, 10 figures. Accepted to ApJ

References in corpus (26)

• Interstellar Dust Grains
• Binary interaction dominates the evolution of massive stars
• Physical Properties of Wolf-Rayet Stars
• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• A 100-parsec elliptical and twisted ring of cold and dense molecular clouds revealed by Herschel around the Galactic Center
• Massive Stars in the Quintuplet Cluster
• A dusty pinwheel nebula around the massive star WR 104
• Line derived infrared extinction towards the Galactic Center
• Pixie Dust: The Silicate Features in the Diffuse Interstellar Medium
• Optical Interferometry in Astronomy
• The Galactic WC stars: Stellar parameters from spectral analyses indicate a new evolutionary sequence
• Michelson Interferometry with the Keck I Telescope
• StarFinder: an IDL GUI based code to analyze crowded fields with isoplanatic correcting PSF fitting
• Three-dimensional dust radiative-transfer models: The Pinwheel Nebula of WR104
• First Science Observations with SOFIA/FORCAST: The FORCAST Mid-infrared Camera
• A near-infrared survey of Miras and the distance to the Galactic Centre
• Point Sources from a Spitzer IRAC Survey of the Galactic Center
• Mid-infrared imaging and spectroscopy of the enigmatic cocoon stars in the Quintuplet Cluster
• Pinwheels in the Quintuplet Cluster
• Stellar Winds and Embedded Star Formation in the Galactic Center Quintuplet and Arches Clusters: Multifrequency Radio Observations
• X-ray Observations of Stellar Clusters Near the Galactic Center
• Massive Binary WR112 and Properties of Wolf-Rayet Dust
• The Quintuplet Cluster III. Hertzsprung-Russell diagram and cluster age
• Radio Properties of Pinwheel Nebulae
• Recurrent dust formation by WR 48a on a 30-year timescale
• Diffuse X-rays from the Arches and Quintuplet clusters

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• Revisiting the Impact of Dust Production from Carbon-Rich Wolf-Rayet Binaries
• Thermophysical modelling and parameter estimation of small solar system bodies via data assimilation
• SOFIA/FORCAST Galactic Center Legacy Survey: Overview
• Emission Lines in the Near-infrared Spectra of the Infrared Quintuplet Stars in the Galactic Center