The mass-loss, expansion velocities and dust production rates of carbon stars in the Magellanic Clouds

Abstract

The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as a function of the stellar parameters by consistently following the growth for several dust species in their circumstellar envelopes, coupled with a stationary wind. Dust radiative transfer is computed taking as input the results of the dust growth calculations. The optical constants for amorphous carbon are selected in order to reproduce different observations in the infrared and optical bands of \textit{Gaia} Data Release 2. We find a tail of extreme mass-losing carbon stars in the Large Magellanic Cloud (LMC) with low gas-to-dust ratios that is not present in the Small Magellanic Cloud (SMC). Typical gas-to-dust ratios are around $700$ for the extreme stars, but they can be down to $\sim 160$--$200$ and $\sim 100$ for a few sources in the SMC and in the LMC, respectively. The total dust production rate for the carbon star population is $\sim 1.77\pm 0.45\times 10^{-5}$~M${}_{\odot }$~yr${}^{-1}$, for the LMC, and $\sim 2.52\pm 0.96\times 10^{-6}$~M${}_{\odot }$~yr${}^{-1}$, for the SMC. The extreme carbon stars observed with the Atacama Large Millimeter Array and their wind speed are studied in detail. For the most dust-obscured star in this sample the estimated mass-loss rate is $\sim 6.3\times 10^{-5}$~M${}_{\odot }$~yr${}^{-1}$. The grids of spectra are available at: https://ambrananni085.wixsite.com/ambrananni/online-data-1 and included in the SED-fitting python package for fitting evolved stars https://github.com/s-goldman/Dusty-Evolved-Star-Kit .

22 pages, 16 figures, accepted for publication in MNRAS

References in corpus (20)

• Evolution of interstellar dust and stardust in the solar neighbourhood
• Spitzer SAGE survey of the Large Magellanic Cloud II: Evolved Stars and Infrared Color Magnitude Diagrams
• The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity
• AGB stars in the Magellanic Clouds. II. The rate of star formation across the LMC
• A Spitzer mid-infrared spectral survey of mass-losing carbon stars in the Large Magellanic Cloud
• The Magellanic zoo: Mid-infrared Spitzer spectroscopy of evolved stars and circumstellar dust in the Magellanic Clouds
• Molecules and dust production in the Magellanic Clouds
• Spitzer spectroscopy of carbon stars in the Small Magellanic Cloud
• Luminosities and mass-loss rates of Local Group AGB stars and Red Supergiants
• Synthetic photometry for carbon-rich giants. IV. An extensive grid of dynamic atmosphere and wind models
• Spitzer Infrared Spectrographic point source classification in the Small Magellanic Cloud
• Effects of Metallicity on the Chemical Composition of Carbon Stars
• Discovery of Extreme Carbon Stars in the Large Magellanic Cloud
• The 12CO/13CO ratio in AGB stars of different chemical type-Connection to the 12C/13C ratio and the evolution along the AGB
• Constraining dust properties in Circumstellar Envelopes of C-stars in the Small Magellanic Cloud: optical constants and grain size of Carbon dust
• Estimating the dust production rate of carbon stars in the Small Magellanic Cloud
• Carbon star wind models at solar and sub-solar metallicities: a comparative study. I. Mass loss and the properties of dust-driven winds
• The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
• A dearth of OH/IR stars in the Small Magellanic Cloud
• Photometric properties of carbon stars in the Small Magellanic Cloud

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• Synthetic photometry for carbon-rich giants. V. Effects of grain-size-dependent dust opacities
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