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New observations an...
New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme
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- Danilovich, Taissa, 1987 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Teyssier, D. (författare)
- European Space Astronomy Centre (ESAC)
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- Justtanont, Kay, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Olofsson, Hans, 1952 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Cerrigone, L. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Bujarrabal, V. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Alcolea, J. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Cernicharo, J. (författare)
- CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
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- Castro-Carrizo, A. (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Garcia-Lario, P. (författare)
- European Space Astronomy Centre (ESAC)
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- Marston, A. P. (författare)
- European Space Astronomy Centre (ESAC)
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(creator_code:org_t)
- 2015-09-02
- 2015
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 581
- Relaterad länk:
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http://publications.... (primary) (free)
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https://www.aanda.or...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Asymptotic giant branch (AGB) stars are in one of the latest evolutionary stages of low to intermediate-mass stars. Their vigorous mass loss has a significant effect on the stellar evolution, and is a significant source of heavy elements and dust grains for the interstellar medium. The mass-loss rate can be well traced by carbon monoxide (CO) line emission. Aims. We present new Herschel/HIFI and IRAM 30 m telescope CO line data for a sample of 53 galactic AGB stars. The lines cover a fairly large range of excitation energy from the J = 1 → 0 line to the J = 9 → 8 line, and even the J = 14 → 13 line in a few cases. We perform radiative transfer modelling for 38 of these sources to estimate their mass-loss rates. Methods. We used a radiative transfer code based on the Monte Carlo method to model the CO line emission. We assume spherically symmetric circumstellar envelopes that are formed by a constant mass-loss rate through a smoothly accelerating wind. Results. We find models that are consistent across a broad range of CO lines for most of the stars in our sample, i.e., a large number of the circumstellar envelopes can be described with a constant mass-loss rate. We also find that an accelerating wind is required to fit, in particular, the higher-J lines and that a velocity law will have a significant effect on the model line intensities. The results cover a wide range of mass-loss rates (~10-8 to 2 × 10-5 M⊙ yr-1) and gas expansion velocities (2 to 21.5 km s-1), and include M-, S-, and C-type AGB stars. Our results generally agree with those of earlier studies, although we tend to find slightly lower mass-loss rates by about 40%, on average. We also present "bonus" lines detected during our CO observations.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Stars: AGB and post-AGB
- Stars: evolution
- Circumstellar matter
- Stars: mass-loss
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Danilovich, Tais ...
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Teyssier, D.
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Justtanont, Kay, ...
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Olofsson, Hans, ...
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Cerrigone, L.
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Bujarrabal, V.
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visa fler...
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Alcolea, J.
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Cernicharo, J.
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Castro-Carrizo, ...
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Garcia-Lario, P.
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Marston, A. P.
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visa färre...
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