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Luna, G.J.M.; Sokoloski, J.L.; Mukai, K.; Nelson, T. "Symbiotic stars in X-rays" (2013) Astronomy and Astrophysics. 559
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Abstract:

Until recently, symbiotic binary systems in which a white dwarf accretes from a red giant were thought to be mainly a soft X-ray population. Here we describe the detection with the X-ray Telescope (XRT) on the Swift satellite of nine white dwarf symbiotics that were not previously known to be X-ray sources and one that had previously been detected as a supersoft X-ray source. The nine new X-ray detections were the result of a survey of 41 symbiotic stars, and they increase the number of symbiotic stars known to be X-ray sources by approximately 30%. The Swift/XRT telescope detected all of the new X-ray sources at energies greater than 2 keV. Their X-ray spectra are consistent with thermal emission and fall naturally into three distinct groups. The first group contains those sources with a single, highly absorbed hard component that we identify as probably coming from an accretion-disk boundary layer. The second group is composed of those sources with a single, soft X-ray spectral component that probably originates in a region where low-velocity shocks produce X-ray emission, i.e., a colliding-wind region. The third group consists of those sources with both hard and soft X-ray spectral components. We also find that unlike in the optical, where rapid, stochastic brightness variations from the accretion disk typically are not seen, detectable UV flickering is a common property of symbiotic stars. Supporting our physical interpretation of the two X-ray spectral components, simultaneous Swift UV photometry shows that symbiotic stars with harder X-ray emission tend to have stronger UV flickering, which is usually associated with accretion through a disk. To place these new observations in the context of previous work on X-ray emission from symbiotic stars, we modified and extended the α/β/γ classification scheme for symbiotic-star X-ray spectra that was introduced by Muerset et al. based upon observations with the ROSAT satellite, to include a new δ classification for sources with hard X-ray emission from the innermost accretion region. Because we have identified the elusive accretion component in the emission from a sample of symbiotic stars, our results have implications for the understanding of wind-fed mass transfer in wide binaries, and the accretion rate in one class of candidate progenitors of type Ia supernovae. © 2013 ESO.

Registro:

Documento: Artículo
Título:Symbiotic stars in X-rays
Autor:Luna, G.J.M.; Sokoloski, J.L.; Mukai, K.; Nelson, T.
Filiación:Instituto de Astronomía y Física Del Espacio (IAFE), CC 67-Suc. 28, C1428ZAA Caba, Argentina
Columbia Astrophysics Lab, 1027 Pupin Hall, Columbia University, 550 W120th St., 10027 NY, United States
CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, United States
Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States
School of Physics and Astronomy, University of Minnesota, 116 Church St SE, Minneapolis, MN 55409, United States
Palabras clave:Accretion, accretion disks; Binaries: symbiotic; X-rays: binaries; Accretion , accretion disks; Binaries: symbiotic; Brightness variations; Classification scheme; Hard x-ray emission; Physical interpretation; Spectral components; X-rays: Binaries; Accretion; Accretion disks; Binaries: symbiotic; Brightness variations; Classification scheme; Physical interpretation; Spectral components; X-rays: Binaries; Electromagnetic wave emission; Electron sources; Flickering; Stars; Telescopes; X ray analysis; X ray apparatus; X ray optics; X ray scattering; X ray spectrographs; Bins; Boundary layers; Electromagnetic wave emission; Electron sources; Flickering; Giant stars; Mass transfer; Stars; Stochastic systems; Supernovae; Telescopes; X ray analysis; X ray apparatus; X ray optics; X ray scattering; X ray spectrographs; X rays; White dwarfs
Año:2013
Volumen:559
DOI: http://dx.doi.org/10.1051/0004-6361/201220792
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v559_n_p_Luna

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Citas:

---------- APA ----------
Luna, G.J.M., Sokoloski, J.L., Mukai, K. & Nelson, T. (2013) . Symbiotic stars in X-rays. Astronomy and Astrophysics, 559.
http://dx.doi.org/10.1051/0004-6361/201220792
---------- CHICAGO ----------
Luna, G.J.M., Sokoloski, J.L., Mukai, K., Nelson, T. "Symbiotic stars in X-rays" . Astronomy and Astrophysics 559 (2013).
http://dx.doi.org/10.1051/0004-6361/201220792
---------- MLA ----------
Luna, G.J.M., Sokoloski, J.L., Mukai, K., Nelson, T. "Symbiotic stars in X-rays" . Astronomy and Astrophysics, vol. 559, 2013.
http://dx.doi.org/10.1051/0004-6361/201220792
---------- VANCOUVER ----------
Luna, G.J.M., Sokoloski, J.L., Mukai, K., Nelson, T. Symbiotic stars in X-rays. Astron. Astrophys. 2013;559.
http://dx.doi.org/10.1051/0004-6361/201220792