Constraining dust properties in Circumstellar Envelopes of C-stars in the Small Magellanic Cloud: optical constants and grain size of Carbon dust

Abstract

We present a new approach aimed at constraining the typical size and optical properties of carbon dust grains in Circumstellar envelopes (CSEs) of carbon-rich stars (C-stars) in the Small Magellanic Cloud (SMC). To achieve this goal, we apply our recent dust growth description, coupled with a radiative transfer code to the CSEs of C-stars evolving along the TP-AGB, for which we compute spectra and colors. Then we compare our modeled colors in the near- and mid-infrared (NIR and MIR) bands with the observed ones, testing different assumptions in our dust scheme and employing several data sets of optical constants for carbon dust available in the literature. Different assumptions adopted in our dust scheme change the typical size of the carbon grains produced. We constrain carbon dust properties by selecting the combination of grain size and optical constants which best reproduces several colors in the NIR and MIR at the same time. The different choices of optical properties and grain size lead to differences in the NIR and MIR colors greater than two magnitudes in some cases. We conclude that the complete set of observed NIR and MIR colors are best reproduced by small grains, with sizes between $\sim$0.035 and $\sim$0.12~$\mu$m, rather than by large grains between $\sim 0.2$ and $0.7$~$\mu$m. The inability of large grains to reproduce NIR and MIR colors seems independent of the adopted optical data set. We also find a possible trend of the grain size with mass-loss and/or carbon excess in the CSEs of these stars.

arXiv comment23 pages, 22 fugures

References in corpus (41)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• Evolution of asymptotic giant branch stars II. Optical to far-infrared isochrones with improved TP-AGB models
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• Self-similarity and scaling behavior of IR emission from radiatively heated dust: I. Theory
• Evolution of asymptotic giant branch stars I. Updated synthetic TP-AGB models and their basic calibration
• The Magellanic Clouds Photometric Survey: The Small Magellanic Cloud Stellar Catalog and Extinction Map
• Evolution of interstellar dust and stardust in the solar neighbourhood
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars I. The COLIBRI Code
• The global gas and dust budget of the Large Magellanic Cloud: AGB stars and supernovae, and the impact on the ISM evolution
• Surveying the Agents of Galaxy Evolution in the Tidally-Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). I. Overview
• The Spitzer Survey of the Small Magellanic Cloud: S3MC Imaging and Photometry in the Mid- and Far-Infrared Wavebands
• Low-temperature gas opacity - AESOPUS: a versatile and quick computational tool
• Luminosities and mass-loss rates of SMC and LMC AGB stars and Red Supergiants
• Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models
• Surveying the Agents of Galaxy Evolution in the Tidally-Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC) II. Cool Evolved Stars
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars II. Dust production at varying metallicity
• AGB stars in the Magellanic Clouds. II. The rate of star formation across the LMC
• The Mass-Loss Return From Evolved Stars to The Large Magellanic Cloud VI: Luminosities and Mass-Loss Rates on Population Scales
• The carrier of the "30" micron emission feature in evolved stars. A simple model using magnesium sulfide
• Dust formation around AGB and SAGB stars: a trend with metallicity?
• The SAGE-Spec Spitzer Legacy program: The life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification I
• Molecules and dust production in the Magellanic Clouds
• Dust from AGBs: relevant factors and modelling uncertainties
• Dust driven mass loss from carbon stars as a function of stellar parameters - I. A grid of Solar-metallicity wind models
• Sublimation Temperature of Circumstellar Dust Particles and Its Importance for Dust Ring Formation
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars IV. Constraining Mass-Loss & Lifetimes of Low Mass, Low Metallicity AGB Stars
• Synthetic photometry for M and K giants and stellar evolution: hydrostatic dust-free model atmospheres and chemical abundances
• The evolved-star dust budget of the Small Magellanic Cloud: the critical role of a few key players
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars V: Constraining the Mass Loss and Lifetimes of Intermediate Mass, Low Metallicity AGB Stars
• AGB stars in the LMC: evolution of dust in circumstellar envelopes
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars III. Dust production at supersolar metallicities
• AGB stars in the SMC: evolution and dust properties based on Spitzer observations
• Dust formation in the winds of AGBs: the contribution at low metallicities
• Synthetic photometry for carbon-rich giants II. The effects of pulsation and circumstellar dust
• Estimating the dust production rate of carbon stars in the Small Magellanic Cloud
• The first 8-13 micron spectra of globular cluster red giants: circumstellar silicate dust grains in 47 Tucanae (NGC 104)
• AGB stars in the Magellanic Clouds. III. The rate of star formation across the SMC
• On the nature of the most obscured C-rich AGB stars in the Magellanic Clouds
• Observational evidence for composite grains in an AGB outflow: MgS in the extreme carbon star LL Peg
• Connecting the evolution of thermally pulsing asymptotic giant branch stars to the chemistry in their circumstellar envelopes -- I. The case of hydrogen cyanide

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• Dust Production around Carbon-Rich Stars: The Role of Metallicity
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