Megahertz emission of massive early-type stars in the Cygnus region

dc.creatorBenaglia, Paula
dc.creatorDe Becker, M.
dc.creatorIshwara Chandra, C. H.
dc.creatorIntema, H. T.
dc.creatorIsequilla, Natacha Laura
dc.date2020-07
dc.date.accessioned2023-08-31T00:28:47Z
dc.date.available2023-08-31T00:28:47Z
dc.identifierhttp://hdl.handle.net/11336/182463
dc.identifierBenaglia, Paula; De Becker, M.; Ishwara Chandra, C. H.; Intema, H. T.; Isequilla, Natacha Laura; Megahertz emission of massive early-type stars in the Cygnus region; Csiro Publishing; Publications Of The Astronomical Society Of Australia; 37; 7-2020; 1-20
dc.identifier1323-3580
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8543464
dc.descriptionMassive, early type stars have been detected as radio sources for many decades. Their thermal winds radiate free-free continuum and in binary systems hosting a colliding-wind region, non-thermal emission has also been detected. To date, the most abundant data have been collected from frequencies higher than 1 GHz. We present here the results obtained from observations at 325 and 610 MHz, carried out with the Giant Metrewave Radio Telescope, of all known Wolf-Rayet and O-type stars encompassed in area of ∼15 sq degrees centred on the Cygnus region. We report on the detection of 11 massive stars, including both Wolf-Rayet and O-type systems. The measured flux densities at decimeter wavelengths allowed us to study the radio spectrum of the binary systems and to propose a consistent interpretation in terms of physical processes affecting the wide-band radio emission from these objects. WR 140 was detected at 610 MHz, but not at 325 MHz, very likely because of the strong impact of free-free absorption. We also report – for the first time – on the detection of a colliding-wind binary system down to 150 MHz, pertaining to the system of WR 146, making use of complementary information extracted from the TIFR GMRT Sky Survey. Its spectral energy distribution clearly shows the turnover at a frequency of about 600 MHz, that we interpret to be due to free-free absorption. Finally, we report on the identification of two additional particle-accelerating colliding-wind binaries, namely Cyg OB2 12 and ALS 15108 AB.
dc.descriptionFil: Benaglia, Paula. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.descriptionFil: De Becker, M.. Université de Liège; Bélgica
dc.descriptionFil: Ishwara Chandra, C. H.. National Centre for Radio Astrophysics; India
dc.descriptionFil: Intema, H. T.. Curtin University; Australia. Leiden University; Países Bajos
dc.descriptionFil: Isequilla, Natacha Laura. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherCsiro Publishing
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/abs/megahertz-emission-of-massive-earlytype-stars-in-the-cygnus-region/F5C91F42218F104356B4A74B9A50D673
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1017/pasa.2020.21
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subjectRADIO CONTINUUM: STARS
dc.subjectRADIATION MECHANISMS: NON-THERMAL
dc.subjectSTELLAR ASSOCIATIONS
dc.subjectINDIVIDUAL: CYG OB2
dc.subjecthttps://purl.org/becyt/ford/1.3
dc.subjecthttps://purl.org/becyt/ford/1
dc.titleMegahertz emission of massive early-type stars in the Cygnus region
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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