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The ALMA detection ...
The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
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- Groenewegen, M. A. T. (författare)
- Royal Observatory of Belgium
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Marigo, P. (författare)
- Università Degli Studi di Padova,University of Padua
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- Sloan, G. C. (författare)
- Space Telescope Science Institute (STScI),Cornell University,The University of North Carolina at Chapel Hill
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- Decin, L. (författare)
- Katholieke Universiteit Leuven
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- Feast, M.W. (författare)
- University of Cape Town,South African Astronomical Observatory
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- Goldman, S. R. (författare)
- Keele University
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- Justtanont, Kay, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Kerschbaum, F. (författare)
- Universität Wien,University of Vienna
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- Matsuura, M. (författare)
- Cardiff University
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- McDonald, I. (författare)
- University of Manchester
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- Olofsson, Hans, 1952 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Sahai, R. (författare)
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- van Loon, J. T. (författare)
- Keele University
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- Wood, P.R. (författare)
- Australian National University
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- Zijlstra, A.A. (författare)
- University of Manchester
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- Bernard-Salas, J. (författare)
- Open University
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- Boyer, M. (författare)
- NASA Goddard Space Flight Center,University of Maryland
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- Guzman-Ramirez, L. (författare)
- European Southern Observatory Santiago,Universiteit Leiden (UL),Leiden University (UL)
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- Jones, O. C. (författare)
- Space Telescope Science Institute (STScI)
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- Lagadec, E. (författare)
- Observatoire de la Cote d'Azur
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- Meixner, M. (författare)
- Space Telescope Science Institute (STScI)
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- Rawlings, M.G. (författare)
- East Asian Observatory
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- Srinivasan, S. (författare)
- Academia Sinica Taiwan
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(creator_code:org_t)
- 2016-11-29
- 2016
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 596, s. 50-
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http://publications.... (primary) (free)
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https://www.aanda.or...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. Low- and intermediate-mass stars lose most of their stellar mass at the end of their lives on the asymptotic giant branch (AGB). Determining gas and dust mass-loss rates (MLRs) is important in quantifying the contribution of evolved stars to the enrichment of the interstellar medium.Aims. This study attempts to spectrally resolve CO thermal line emission in a small sample of AGB stars in the Large Magellanic Cloud (LMC).Methods. The Atacama Large Millimeter Array was used to observe two OH/IR stars and four carbon stars in the LMC in the CO J = 2−1 line.Results. We present the first measurement of expansion velocities in extragalactic carbon stars. All four C stars are detected and wind expansion velocities and stellar velocities are directly measured. Mass-loss rates are derived from modelling the spectral energy distribution and Spitzer/IRS spectrum with the DUSTY code. The derived gas-to-dust ratios allow the predicted velocities to agree with the observed gas-to-dust ratios. The expansion velocities and MLRs are compared to a Galactic sample of well-studied relatively low MLRs stars supplemented with extreme C stars with properties that are more similar to the LMC targets. Gas MLRs derived from a simple formula are significantly smaller than those derived from dust modelling, indicating an order of magnitude underestimate of the estimated CO abundance, time-variable mass loss, or that the CO intensities in LMC stars are lower than predicted by the formula derived for Galactic objects. This could be related to a stronger interstellar radiation field in the LMC.Conclusions. Although the LMC sample is small and the comparison to Galactic stars is non-trivial because of uncertainties in their distances (hence luminosities), it appears that for C stars the wind expansion velocities in the LMC are lower than in the solar neighbourhood, while the MLRs appear to be similar. This is in agreement with dynamical dust-driven wind models.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: AGB and post-AGB / stars: winds
- outflows / radio continuum: stars
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Groenewegen, M. ...
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Vlemmings, Woute ...
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Marigo, P.
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Sloan, G. C.
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Decin, L.
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Feast, M.W.
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visa fler...
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Goldman, S. R.
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Justtanont, Kay, ...
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Kerschbaum, F.
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Matsuura, M.
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McDonald, I.
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Olofsson, Hans, ...
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Sahai, R.
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van Loon, J. T.
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Wood, P.R.
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Zijlstra, A.A.
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Bernard-Salas, J ...
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Boyer, M.
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Guzman-Ramirez, ...
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Jones, O. C.
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Lagadec, E.
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Meixner, M.
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Rawlings, M.G.
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Srinivasan, S.
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