All Tables

Table 1: X-ray detected Praesepe members. $\Delta r$ is the distance to the optical position. The column labeled "set'' indicates whether the source was detected on the summed dataset (S) or only on the MOS (M) or PN (P) single datasets. Count rates are MOS equivalent count rates, except where set = P, when they are PN count rates. Luminosities were derived using the appropriate conversion factors (see text).
Table 2: $3\sigma$ upper limits for undetected Praesepe members. Upper limits have been derived from the summed dataset.
Table 3: X-ray sources with at least an optical counterpart which is a cluster non-member or has no membership information. See Table 1 for the meaning of the "set'' column.
Table 4: Best-fit parameters for KW 224, KW 212 and KW 181. Errors are 90% confidence ranges for one interesting parameter.