SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS
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...
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todo:paper_0004637X_v824_n1_p_Nunez2023-10-03T14:02:40Z SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS Nuñez, N.E. Nelson, T. Mukai, K. Sokoloski, J.L. Luna, G.J.M. binaries: symbiotic X-rays: individual (CD-28 3719, EG And, Hen 3-461, Hen 3-1591, 4 Dra) 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.. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v824_n1_p_Nunez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
binaries: symbiotic X-rays: individual (CD-28 3719, EG And, Hen 3-461, Hen 3-1591, 4 Dra) |
| spellingShingle |
binaries: symbiotic X-rays: individual (CD-28 3719, EG And, Hen 3-461, Hen 3-1591, 4 Dra) Nuñez, N.E. Nelson, T. Mukai, K. Sokoloski, J.L. Luna, G.J.M. SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS |
| topic_facet |
binaries: symbiotic X-rays: individual (CD-28 3719, EG And, Hen 3-461, Hen 3-1591, 4 Dra) |
| description |
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.. |
| format |
JOUR |
| author |
Nuñez, N.E. Nelson, T. Mukai, K. Sokoloski, J.L. Luna, G.J.M. |
| author_facet |
Nuñez, N.E. Nelson, T. Mukai, K. Sokoloski, J.L. Luna, G.J.M. |
| author_sort |
Nuñez, N.E. |
| title |
SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS |
| title_short |
SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS |
| title_full |
SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS |
| title_fullStr |
SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS |
| title_full_unstemmed |
SYMBIOTIC STARS in X-RAYS. III. SUZAKU OBSERVATIONS |
| title_sort |
symbiotic stars in x-rays. iii. suzaku observations |
| url |
http://hdl.handle.net/20.500.12110/paper_0004637X_v824_n1_p_Nunez |
| work_keys_str_mv |
AT nunezne symbioticstarsinxraysiiisuzakuobservations AT nelsont symbioticstarsinxraysiiisuzakuobservations AT mukaik symbioticstarsinxraysiiisuzakuobservations AT sokoloskijl symbioticstarsinxraysiiisuzakuobservations AT lunagjm symbioticstarsinxraysiiisuzakuobservations |
| _version_ |
1807314519831085056 |