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Hints of the Existe...
Hints of the Existence of C-rich Massive Evolved Stars
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- Quintana-Lacaci, Guillermo (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Cernicharo, Jose (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Agundez, Marcelino (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Pablo Fonfria, Jose (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Velilla Prieto, Luis, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sanchez Contreras, Carmen (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Bujarrabal, Valentin (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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Castro-Carrizo, Arancha (författare)
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- Alcolea, Javier (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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(creator_code:org_t)
- 2019-05-09
- 2019
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 876:2
- Relaterad länk:
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https://digital.csic...
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https://doi.org/10.3...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- We aim to study the properties of a particular type of evolved stars, C-rich evolved stars with high expansion velocities. For this purpose we have focused on the two best studied objects within this group, IRC+10401 and AFGL 2233. We focused on determining their luminosity by studying their spectral energy distribution. Also, we have obtained single-dish line profiles and interferometric maps of the CO J - 1-0 and J = 2-1. emission lines for both objects. We have modeled this emission using a LVG radiative transfer code to determine the kinetic temperature and density profiles of the gas ejected by these stars. We have found that the luminosities obtained for these objects (log(L/L-circle dot). =. 4.1 and 5.4) locate them in the domain of the massive asymptotic giant branch stars (AGBs) and the red supergiant stars (RSGs). In addition, the mass-loss rates obtained (1.5. x. 10(-5)-6. x 10(-3)M(circle dot) yr(-1)) suggest that while IRC+ 10401 might be an AGB star, AFGL 2233 could be an RSG star. All these results, together with those from previous works, suggest that both objects are massive objects, IRC+10401 a massive evolved star with M-init similar to 5-9M(circle dot). which could correspond to an AGB or an RSG and AFGL 2233 an RSG with M-init similar to 20M(circle dot), which would confirm the existence of massive C-rich evolved stars. Two scenarios are proposed to form these types of objects. The first one is capable of producing high-mass AGB stars up to similar to 8M(circle dot). and the second one is capable of forming C-rich RSGs like AFGL 2233.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- circumstellar matter
- nuclear reactions, nucleosynthesis, abundances
- stars: AGB and post-AGB
- stars: evolution
- astrochemistry
- supergiants
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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