Based on observations collected 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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Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/418/841

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...é

Research Fellow FNRS (Belgium).

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... Antokhin

On leave from Sternberg Astronomical Institute, Moscow University, Russia.

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... Rauw

Research Associate FNRS (Belgium).

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... brightness

Note that the algorithm used to derive the photometry can only handle a single PSF. However, the errors due to this approximation are certainly smaller than those due to the crowdedness of the field.

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... 2MASS entry

2MASS designations are not included since they are simply the coordinates of the sources.

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...1970)

Note that if we use the coordinates found in the USNO, GSC, and 2MASS catalogs, the X-ray source is less than 1 $.\!\!^{\prime\prime}$ 2 away from the cluster core.

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... extracted

To ensure a correct determination of the X-ray properties of the sources, all extractions (spectra, lightcurves) were made in detector coordinates.

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... et al.

Note that Williams et al. (1999) wrongly quoted the value from that paper, but this error did not affect their analysis since they finally used the H I data from a high-resolution ATCA H I survey.

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... by PGMW

[W99] 30, 89, 44 (the WC4 star), 62, 21, 84, 50, 41, 51, 68, 61, 72, 36, 87, 75, and PGMW 1052, 1110, 1125, 1160, 1194, 1200, 1239, 1288, 1292, 1303, 1310, 1321, 1342, 1343, 1350, 1357, 1365, 1377.

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... spectrum

To avoid contamination from the nearby XMMU J045749.2-662726 (source #36), we had to extract the spectra in a small region some 17 $.\!\!^{\prime\prime}$ 5 in radius. A correction to the encircled energy loss is made via the option $\it modelee=yes$ of the arfgen task.

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