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
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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
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Palabras clave: | Binaries: symbiotic; Galaxies: individual: M31; White dwarfs; X-rays: binaries; X-rays: individual: CXO J004318.8+412016 |
Año: | 2017
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Volumen: | 470
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Número: | 2
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Página de inicio: | 2212
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Página de fin: | 2224
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DOI: |
http://dx.doi.org/10.1093/mnras/stx1355 |
Título revista: | Monthly Notices of the Royal Astronomical Society
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Título revista abreviado: | Mon. Not. R. Astron. Soc.
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ISSN: | 00358711
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CODEN: | MNRAA
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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