Accretion disc coronae and the X-ray source in M15

Details Accretion disc coronae and the X-ray source in M15 Accretion disc coronae and the X-ray source in M15

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225p..29f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 15, 1987, p. 29P-31P.

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21

Accretion Disks, Coronas, X Ray Sources, Light Curve, Metallicity, X Ray Scattering

Scientific paper

Recent confirmation of the identification of the X-ray source in M15 with the blue object AC 211 and a report of a sinusoidal X-ray light curve strengthen the possibility that the source contains an accretion disc corona. The authors argue that the low metallicity of M15 allows the corona to be very extensive. Scattering of X-rays on to the face of the disc explains the high U-magnitude of AC 211. The low LX/Lopt ratio found for this and other sources with accretion disc coronae may thus be due to an increased optical flux and not, as previously hypothesized, to our line-of-sight intercepting little of the X-ray flux.

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