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dc.contributor.author
Duronea, Nicolas Urbano
dc.contributor.author
Arnal, Edmundo Marcelo
dc.contributor.author
Testori, Juan Carlos
dc.date.available
2017-05-22T20:01:53Z
dc.date.issued
2012-04
dc.identifier.citation
Duronea, Nicolas Urbano; Arnal, Edmundo Marcelo; Testori, Juan Carlos; NANTEN 12CO (J = 1 → 0) observations around the star WR 55; Edp Sciences; Astronomy And Astrophysics; 540; 4-2012; 121-135
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/16822
dc.description.abstract
Context. We present a complete study of the molecular and ionized gas in the environs of the nebula RCW 78 around WR 55.
Aims. We investigate the spatial distribution, physical characteristics, and kinematical properties of the molecular gas linked to the galactic nebula RCW 78 to obtain a clearer understanding of its interaction with both the star and the ionized gas.
Methods. Our study is based on 12CO(1–0) fully sampled observations of a region of ∼0. ◦45 in size around the star WR 55 and the nebula RCW 78 obtained with the 4-m NANTEN telescope, radio continuum archival data at 1.4 and 4.85 GHz, obtained from the SGPS and PMNRAO Southern Radio Survey, respectively, and available infrared MIPSGAL images at 24 μm.
Results. A molecular gas component in the velocity range from ∼–58 km s−1 to –45 km s−1, which is compatible with the velocity of the ionized gas, was found to be associated with the optical nebula. Adopting a distance of ∼5 kpc, the mass of this molecular component is about 3.4 × 104 M . Our analysis of the molecular data reveals a velocity gradient that is consistent with that found for the Hα line. New radio-continuum flux-density determinations confirm the thermal nature of RCW 78. This indicates that the ionized gas in RCW 78 arises from the photoionization of the molecular gas component in the velocity range from −58 km s−1 to −45 km s−1.
A molecular concentration at a velocity of −56.1 km s−1 (identified as C1) is likely associated with the star HD 117797 and with an ensemble of candidate YSOs, lying at a distance of 3.9 kpc, while the rest of the molecular gas at velocities between –56 km s−1 and –46 km s−1 constitute an incomplete ring-like structure expanding around WR 55 at a velocity of about ∼5 km s−1. Mechanical energy and time requirements indicate that WR 55 is very capable of sustaining the expansion of the nebula.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Edp Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Molecules
dc.subject
Wolf Rayet Stars
dc.subject
Hii Regions
dc.subject
Interstellar Medium
dc.subject.classification
Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
NANTEN 12CO (J = 1 → 0) observations around the star WR 55
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-15T17:05:14Z
dc.journal.volume
540
dc.journal.pagination
121-135
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Duronea, Nicolas Urbano. Provincia de Buenos Aires. Gobernación. Comision de Invest.científicas. Instituto Argentino de Radioastronomia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - la Plata. Instituto Argentino de Radioastronomia; Argentina
dc.description.fil
Fil: Arnal, Edmundo Marcelo. Provincia de Buenos Aires. Gobernación. Comision de Invest.científicas. Instituto Argentino de Radioastronomia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - la Plata. Instituto Argentino de Radioastronomia; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.description.fil
Fil: Testori, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comision de Invest.científicas. Instituto Argentino de Radioastronomia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - la Plata. Instituto Argentino de Radioastronomia; Argentina
dc.journal.title
Astronomy And Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201118764
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2012/04/aa18764-11/aa18764-11.html
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