Show simple item record Nuñez, Natalia Edith Nelson, T. Mukai, K. Sokoloski, J. L. Luna, Gerardo Juan Manuel 2017-06-14T18:44:01Z 2016-06-07
dc.identifier.citation Nuñez, Natalia Edith; Nelson, T.; Mukai, K.; Sokoloski, J. L.; Luna, Gerardo Juan Manuel; Symbiotic stars in X-rays III. Suzaku observations; Iop Publishing; Astrophysical Journal; 824; 1; 7-6-2016; 23,1-10
dc.identifier.issn 0004-637X
dc.description.abstract We describe the X-ray emission as observed by Suzaku from five symbiotic stars that we selected for deep Suzaku observations after their initial detection with ROSAT, ASCA, and Swift. We find that the X-ray spectra of all five sources can be adequately fit with absorbed optically thin thermal plasma models, with either single- or multi-temperature plasmas. These models are compatible with the X-ray emission originating in the boundary layer between an accretion disk and a white dwarf. The high plasma temperatures of kT > 3 keV for all five targets were greater than expected for colliding winds. Based on these high temperatures as well as previous measurements of UV variability and UV luminosity and the large amplitude of X-ray flickering in 4 Dra, we conclude that all five sources are accretion-powered through predominantly optically thick boundary layers. Our X-ray data allow us to observe a small optically thin portion of the emission from these boundary layers. Given the time between previous observations and these observations, we find that the intrinsic X-ray flux and the intervening absorbing column can vary by factors of three or more on a timescale of years. However, the location of the absorber and the relationship between changes in accretion rate and absorption are still elusive.
dc.format application/pdf
dc.language.iso eng
dc.publisher Iop Publishing
dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject binaries: symbiotic, X-rays
dc.subject individuals: CD -28 3719, EG And, Hen 3-461, Hen 3-1591
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Symbiotic stars in X-rays III. Suzaku observations
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2017-06-13T14:14:19Z
dc.journal.volume 824
dc.journal.number 1
dc.journal.pagination 23,1-10
dc.journal.pais Reino Unido
dc.journal.ciudad Londres
dc.description.fil Fil: Nuñez, Natalia Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
dc.description.fil Fil: Nelson, T.. University Of Minnesota; Estados Unidos
dc.description.fil Fil: Mukai, K.. University of Maryland; Estados Unidos
dc.description.fil Fil: Sokoloski, J. L.. Columbia University; Estados Unidos
dc.description.fil Fil: Luna, Gerardo Juan Manuel. 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
dc.journal.title Astrophysical Journal
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/ark/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/arxiv/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/

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