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dc.contributor.author
Orio, Marina
dc.contributor.author
Luna, Gerardo Juan Manuel
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dc.contributor.author
Kotulla, R.
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Gallager, J. S.
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Zampieri, L.
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Mikolajewska, J.
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Harbeck, D.
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Bianchini, A.
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Chiosi, E.
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Della Valle, M.
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de Martino, D.
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Kaur, A.
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Mapelli, M.
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Munari, U.
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Odendaal, A.
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Trinchieri, G.
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Wade, J.
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Zemko, P.
dc.date.available
2017-09-19T15:34:22Z
dc.date.issued
2017-09
dc.identifier.citation
Orio, Marina; Luna, Gerardo Juan Manuel; Kotulla, R.; Gallager, J. S.; Zampieri, L.; et al.; CXO J004318.8+412016*A steady supersoft X-ray source in M 31; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 470; 2; 9-2017; 2212-2224
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/24574
dc.description.abstract
We obtained an optical spectrum of a star we identify as the optical counterpart of the M31 Chandra source CXO J004318.8+412016, because of prominent emission lines of the Balmer series, of neutral helium, and a He II line at 4686 Å. The continuum energy distribution and the spectral characteristics demonstrate the presence of a red giant of K or earlier spectral type, so we concluded that the binary is likely to be a symbiotic system. CXO J004318.8+412016 has been observed in X-rays as a luminous supersoft source (SSS) since 1979, with effective temperature exceeding 40 eV and variable X-ray luminosity, oscillating between a few times 1035 erg s-1 and a few times 1037 erg s-1 in the space of a few weeks. The optical, infrared and ultraviolet colours of the optical object are consistent with an an accretion disc around a compact object companion, which may be either a white dwarf or a black hole, depending on the system parameters. If the origin of the luminous supersoft X-rays is the atmosphere of a white dwarf that is burning hydrogen in shell, it is as hot and luminous as post-thermonuclear flash novae, yet no major optical outburst has ever been observed, suggesting that the white dwarf is very massive (m ≥ 1.2 M⊙) and it is accreting and burning at the high rate m > 10-8 M⊙ yr-1 expected for Type Ia supernovae progenitors. In this case, the X-ray variability may be due to a very short recurrence time of only mildly degenerate thermonuclear flashes.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Binaries: Symbiotic
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Galaxies: Individual: M31
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White Dwarfs
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X-Rays: Binaries
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X-Rays: Individual: Cxo J004318.8+412016
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Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
CXO J004318.8+412016*A steady supersoft X-ray source in M 31
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-04T15:10:54Z
dc.journal.volume
470
dc.journal.number
2
dc.journal.pagination
2212-2224
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Orio, Marina. Osservatorio Astronomico Di Padova; Italia. University of Wisconsin; Estados Unidos
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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. Universidad de Buenos Aires; Argentina
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Fil: Kotulla, R.. University of Wisconsin; Estados Unidos
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Fil: Gallager, J. S.. University of Wisconsin; Estados Unidos
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Fil: Zampieri, L.. Osservatorio Astronomico Di Padova; Italia
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Fil: Mikolajewska, J.. Nicolaus Copernicus Astronomical Center Of The Polish Academy Of Sciences; Polonia
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Fil: Harbeck, D.. Wiyn Observatory; Estados Unidos
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Fil: Bianchini, A.. Università di Padova; Italia
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Fil: Chiosi, E.. Università di Padova; Italia
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Fil: Della Valle, M.. Osservatorio Astronomico Di Capodimonte; Italia
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Fil: de Martino, D.. Osservatorio Astronomico Di Capodimonte; Italia
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Fil: Kaur, A.. Clemson University; Estados Unidos
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Fil: Mapelli, M.. Osservatorio di Padova; Italia
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Fil: Munari, U.. Osservatorio di Padova; Italia
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Fil: Odendaal, A.. University of the Free State; Sudáfrica
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Fil: Trinchieri, G.. Osservatorio Astronomico di Brera; Italia
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Fil: Wade, J.. University of Wisconsin; Estados Unidos
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Fil: Zemko, P.. Università di Padova; Italia
dc.journal.title
Monthly Notices of the Royal Astronomical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stx1355
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/470/2/2212/3861854/CXO-J004318-8-412016-a-steady-supersoft-X-ray?redirectedFrom=fulltext
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