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Nuñez, N.E.; Nelson, T.; Mukai, K.; Sokoloski, J.L.; Luna, G.J.M. "SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS" (2016) Astrophysical Journal. 824(1)
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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. © 2016. The American Astronomical Society. All rights reserved..

Registro:

Documento: Artículo
Título:SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS
Autor:Nuñez, N.E.; Nelson, T.; Mukai, K.; Sokoloski, J.L.; Luna, G.J.M.
Filiación:Instituto de Ciencias Astronómicas de la Tierra y Del Espacio (ICATE-UNSJ, CONICET), Av. España (S) 1512, San Juan, J5402DSP, Argentina
Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455, United States
CRESST, X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20 771, United States
Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21 250, United States
Columbia Astrophysics Lab, 1027 Pupin Hall, MC 5247, Columbia University, 550 W120th St.NY 10027, United States
Instituto de Astronomía y Física Del Espacio (IAFE, CONICET-UBA), Av. Inte. Güiraldes 2620, Buenos Aires, C1428ZAA, Argentina
Palabras clave:binaries: symbiotic; X-rays: individual (CD-28 3719, EG And, Hen 3-461, Hen 3-1591, 4 Dra)
Año:2016
Volumen:824
Número:1
DOI: http://dx.doi.org/10.3847/0004-637X/824/1/23
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v824_n1_p_Nunez

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Citas:

---------- APA ----------
Nuñez, N.E., Nelson, T., Mukai, K., Sokoloski, J.L. & Luna, G.J.M. (2016) . SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS. Astrophysical Journal, 824(1).
http://dx.doi.org/10.3847/0004-637X/824/1/23
---------- CHICAGO ----------
Nuñez, N.E., Nelson, T., Mukai, K., Sokoloski, J.L., Luna, G.J.M. "SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS" . Astrophysical Journal 824, no. 1 (2016).
http://dx.doi.org/10.3847/0004-637X/824/1/23
---------- MLA ----------
Nuñez, N.E., Nelson, T., Mukai, K., Sokoloski, J.L., Luna, G.J.M. "SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS" . Astrophysical Journal, vol. 824, no. 1, 2016.
http://dx.doi.org/10.3847/0004-637X/824/1/23
---------- VANCOUVER ----------
Nuñez, N.E., Nelson, T., Mukai, K., Sokoloski, J.L., Luna, G.J.M. SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS. Astrophys. J. 2016;824(1).
http://dx.doi.org/10.3847/0004-637X/824/1/23