CXO J004318.8+412016, a steady supersoft X-ray source in M 31

Marina Orio,G. J. M. Luna,Ralf Kotulla, J. S. Gallager,L. Zampieri,Joanna Mikolajewska,Daniel R. Harbeck,A. Bianchini, E. Chiosi, M. Della Valle, D. de Martino,Aman Kaur, Michela Mapelli,Ulisse Munari,A. Odendaal,G. Trinchieri,J. Wade,P. Zemko

Monthly Notices of the Royal Astronomical Society（2017）

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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 bin...

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Key words

binaries: symbiotic,white dwarfs,galaxies: individual: M31,X-rays: binaries,X-rays: individual: CXO J004318.8+412016

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