... NGC 6530

Based on observations with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member states and the USA (NASA).

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...1,

Research Associate FNRS (Belgium).

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...é^1,

Research Fellow FNRS (Belgium).

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... (GSC

The Guide Star Catalogue-II is a joint project of the Space Telescope Science Institute and the Osservatorio Astronomico di Torino.

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... only

If we correct for the entire (i.e. fitted) column density, we obtain a corrected intrinsic flux that would be about 7 times larger (although a proper wind absorption model, accounting for the ionization of the wind material would be required, see e.g. Waldron et al. 1998).

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