Conferencia
Abstract:
GK Per, a classical nova of 1901, is thought to undergo variable mass accretion onto a magnetized white dwarf (WD) in an intermediate polar system (IP). We organized a multi-mission observational campaign in the X-ray and ultraviolet (UV) energy ranges during its dwarf nova (DN) outburst in 2015 March-April. Comparing data from quiescence and near outburst, we have found that the maximum plasma temperature decreased from 26 to 16 keV. This is consistent with the previously proposed scenario of increase in mass accretion rate while the inner radius of the magnetically disrupted accretion disk shrinks, thereby lowering the shock temperature. A NuS-TAR observation also revealed a high-amplitude WD spin modulation of the very hard X-rays, suggesting an obscuration of the lower accretion pole and an extended shock region on the WD surface. In the Chandra observation with the High Energy Transmission Gratings (HETG), we detected prominent emission lines, where the ratios of H-like to He-like transition for each element indicate a much lower temperature than the underlying continuum. We suggest that the X-ray spectrum in the 0.8-2 keV range results from emission from different regions of collisionally ionized plasma with a possible contribution from photoionization processes. © Copyright owned by the author(s) under the terms of the Creative Commons.
Registro:
| Documento: | Conferencia |
| Título: | Multi-mission observations of the old nova GK Per during the 2015 outburst |
| Autor: | Zemko, P.; Orio, M.; Luna, G.J.M.; Mukai, K. |
| Filiación: | Department of Physics and Astronomy, Universitá di Padova, vicolo dell'Osservatorio 3, Padova, I-35122, Italy INAF - Osservatorio di Padova, vicolo dell'Osservatorio 5, Padova, I-35122, Italy Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison, WI 53704, United States Instituto de Astronomía y Física del Espacio, IAFE, CONICET-UBA, CC 67 - Suc. 28 (C1428ZAA), Caba, Argentina CRESST, X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States |
| Palabras clave: | Photoionization; X rays; Accretion disks; Classical novae; Energy transmission; Lower temperatures; Photoionization process; Plasma temperature; Shock temperature; Spin modulations; White dwarfs |
| Año: | 2015 |
| Título revista: | 3rd Conference on Golden Age of Cataclysmic Variables and Related Objects, Golden 2015 |
| Título revista abreviado: | Proc. Sci. |
| ISSN: | 18248039 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v_n_p_Zemko |
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Citas:
---------- APA ----------
Zemko, P., Orio, M., Luna, G.J.M. & Mukai, K. (2015) . Multi-mission observations of the old nova GK Per during the 2015 outburst. 3rd Conference on Golden Age of Cataclysmic Variables and Related Objects, Golden 2015.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v_n_p_Zemko [ ]
---------- CHICAGO ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K. "Multi-mission observations of the old nova GK Per during the 2015 outburst" . 3rd Conference on Golden Age of Cataclysmic Variables and Related Objects, Golden 2015 (2015).Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v_n_p_Zemko [ ]
---------- MLA ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K. "Multi-mission observations of the old nova GK Per during the 2015 outburst" . 3rd Conference on Golden Age of Cataclysmic Variables and Related Objects, Golden 2015, 2015.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v_n_p_Zemko [ ]
---------- VANCOUVER ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K. Multi-mission observations of the old nova GK Per during the 2015 outburst. Proc. Sci. 2015.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v_n_p_Zemko [ ]
