Artículo

Orio, M.; Luna, G.J.M.; Kotulla, R.; Gallager, J.S.; Zampieri, L.; Mikolajewska, J.; Harbeck, D.; Bianchini, A.; Chiosi, E.; Della Valle, M.; de Martino, D.; Kaur, A.; Mapelli, M.; Munari, U.; Odendaal, A.; Trinchieri, G.; Wade, J.; Zemko, P."CXO J004318.8+412016*A steady supersoft X-ray source in M 31" (2017) Monthly Notices of the Royal Astronomical Society. 470(2):2212-2224
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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. © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Registro:

Documento: Artículo
Título:CXO J004318.8+412016*A steady supersoft X-ray source in M 31
Autor:Orio, M.; Luna, G.J.M.; Kotulla, R.; Gallager, J.S.; Zampieri, L.; Mikolajewska, J.; Harbeck, D.; Bianchini, A.; Chiosi, E.; Della Valle, M.; de Martino, D.; Kaur, A.; Mapelli, M.; Munari, U.; Odendaal, A.; Trinchieri, G.; Wade, J.; Zemko, P.
Filiación:Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison, WI 53704, United States
INAF-Osservatorio di Padova, vicolo dell' Osservatorio 5, Padova, I-35122, Italy
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina
CONICET-Universidad de Buenos Aires, Instituto de Astronomía y Física del Espacio (IAFE), Av. Inte. Güiraldes 2620, Buenos Aires, C1428ZAA, Argentina
Universidad Nacional Arturo Jauretche, Av. Calchaquí 6200, F. Varela, Buenos Aires, Argentina
N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, Warsaw, PL 00-716, Poland
WIYN Observatory, Tucson, AZ 85719, United States
Dipartimento di Astronomia, Universitá di Padova, vicolo Osservatorio, 2, Padova, 35122, Italy
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, Napoli, I-80131, Italy
International Center for Relativistic Astrophysics, Piazzale della Repubblica, 2, Pescara, 65122, Italy
Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, United States
Department of Physics, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa
INAF-Osservatorio Astronomico di Brera, via Brera 28, Milano, 20121, Italy
Palabras clave:Binaries: symbiotic; Galaxies: individual: M31; White dwarfs; X-rays: binaries; X-rays: individual: CXO J004318.8+412016
Año:2017
Volumen:470
Número:2
Página de inicio:2212
Página de fin:2224
DOI: http://dx.doi.org/10.1093/mnras/stx1355
Handle:http://hdl.handle.net/20.500.12110/paper_00358711_v470_n2_p2212_Orio
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v470_n2_p2212_Orio

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Citas:

---------- APA ----------
Orio, M., Luna, G.J.M., Kotulla, R., Gallager, J.S., Zampieri, L., Mikolajewska, J., Harbeck, D.,..., Zemko, P. (2017) . CXO J004318.8+412016*A steady supersoft X-ray source in M 31. Monthly Notices of the Royal Astronomical Society, 470(2), 2212-2224.
http://dx.doi.org/10.1093/mnras/stx1355
---------- CHICAGO ----------
Orio, M., Luna, G.J.M., Kotulla, R., Gallager, J.S., Zampieri, L., Mikolajewska, J., et al. "CXO J004318.8+412016*A steady supersoft X-ray source in M 31" . Monthly Notices of the Royal Astronomical Society 470, no. 2 (2017) : 2212-2224.
http://dx.doi.org/10.1093/mnras/stx1355
---------- MLA ----------
Orio, M., Luna, G.J.M., Kotulla, R., Gallager, J.S., Zampieri, L., Mikolajewska, J., et al. "CXO J004318.8+412016*A steady supersoft X-ray source in M 31" . Monthly Notices of the Royal Astronomical Society, vol. 470, no. 2, 2017, pp. 2212-2224.
http://dx.doi.org/10.1093/mnras/stx1355
---------- VANCOUVER ----------
Orio, M., Luna, G.J.M., Kotulla, R., Gallager, J.S., Zampieri, L., Mikolajewska, J., et al. CXO J004318.8+412016*A steady supersoft X-ray source in M 31. Mon. Not. R. Astron. Soc. 2017;470(2):2212-2224.
http://dx.doi.org/10.1093/mnras/stx1355