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Hints of the Existe...
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Quintana-Lacaci, GuillermoAgencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
(författare)
Hints of the Existence of C-rich Massive Evolved Stars
- Artikel/kapitelEngelska2019
Förlag, utgivningsår, omfång ...
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2019-05-09
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American Astronomical Society,2019
Nummerbeteckningar
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LIBRIS-ID:oai:research.chalmers.se:a188d229-dbe3-4c1a-b994-e575bbb340b8
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https://doi.org/10.3847/1538-4357/ab133eDOI
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https://research.chalmers.se/publication/510581URI
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https://research.chalmers.se/publication/510971URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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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 och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Cernicharo, JoseAgencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
(författare)
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Agundez, MarcelinoAgencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
(författare)
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Pablo Fonfria, JoseAgencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
(författare)
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Velilla Prieto, Luis,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)velilla
(författare)
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Sanchez Contreras, CarmenAgencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
(författare)
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Bujarrabal, ValentinObservatorio de Yebes (IGN),Yebes Observatory
(författare)
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Castro-Carrizo, Arancha
(författare)
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Alcolea, JavierObservatorio de Yebes (IGN),Yebes Observatory
(författare)
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Agencia Estatal Consejo Superior de Investigaciones CientíficasChalmers tekniska högskola
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Astrophysical Journal: American Astronomical Society876:21538-43570004-637X
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