Table 2: An X-ray and kinematic data ensemble for each star detailed in Table 1.
TARGET RASS X-ray^a,b,c Log $L^{d}_{\rm x}$ Log ( $L_{\rm x}$ / $L_{\rm bol}$ ) $P_{\rm rot}$ $v \sin i$ HJD RV $v \sin i$ Comments^e

ct rate [ct s^-1] [erg s^-1] [days] [kms^-1] (+2450000) [kms^-1] [kms^-1]

Lupus :

RX J1507.2-3505 $0.07 \pm 0.02$ 29.99 -4.09 15.0 2713.762 +2.1 13.0 RV = +1.4

2718.766 +2.2 13.2

RX J1507.4-4601 $0.06 \pm 0.02$ 29.93 -3.30 2718.790 +6.9 21.7

RX J1515.7-3331 $0.10 \pm 0.02$ 30.15 -3.61 2.28 25.0 2713.860 +1.1 22.3

2718.925 +1.9 23.4

RX J1518.4-3738 $0.13 \pm 0.02$ 30.26 -3.36 2.98 25.0 2718.746 +3.7 21.6 RV = +3.7

RX J1523.4-4055 $0.037 \pm 0.012$ 29.71 -3.62 4.15 9.9 2719.769 +5.6 11.7 RV = +6.8

RX J1524.5-3652 $0.06 \pm 0.02$ 29.93 -3.55 2.91 19.0 2713.826 +4.4 16.4 RV = +4.2

2719.792 +4.6 17.6

RX J1525.0-3604 $0.13 \pm 0.02$ 30.26 -3.44 2718.852 +4.8 23.2

RX J1529.6-3546 $0.11 \pm 0.02$ 30.19 2718.879 +16.4 19.3 SB2

2718.879 -11.3 19.5 SB2

RX J1529.7-3628 $0.06 \pm 0.02$ 29.93 2719.715 +3.2 14.5

RX J1546.6-3618 $0.05 \pm 0.02$ 29.85 -3.69 7.1 2713.705 +7.2 $\leq$ 6 RV = +2.5

2719.747 +7.3 $\leq$ 6

RX J1547.6-4018 $0.06 \pm 0.01$ 29.93 -3.67 10.0 2713.737 +3.1 11.8 RV = +2.8

2718.916 +3.2 12.9

RX J1601.1-3320 $0.10 \pm 0.02$ 30.15 -3.62 3.78 21.9 2713.799 +2.3 18.8 RV = +3.0

RX J1605.7-3905 $0.16 \pm 0.02$ 30.35 -3.40 2713.780 +2.2 >50

RX J1608.9-3905 $\sim49$ 2718.900 +9.7 30.4 RV = -0.6

2718.900 -25.8 24.1 SB2

Chamaeleon I $\&$ II

RX J0850.1-7554 $0.17 \pm 0.02$ 30.68 -3.30 45 2712.590 +17.1 49.4 RV = +15.5

2718.521 +35.0 26.5 SB2?

2718.521 -0.8 23.3 SB2?

RX J0951.9-7901 $0.17 \pm 0.02$ 30.68 -3.54 73 2712.620 +39.8 49.0 RV = +12.2

2712.620 -20.3 32.6 SB2?

2718.533 +38.1 47.2 SB2?

2718.533 -35.1 32.3 SB2?

RX J1112.7-7637 $0.08 \pm 0.02$ 30.36 -3.31 11 2712.694 +13.6 30.7 RV = +16.0

2718.546 +15.2 28.4

RX J1129.2-7546 20 2713.628 +15.9 20.8 RV = +11.4

2719.528 +15.5 19.9

RX J1140.3-8321 $0.11 \pm 0.02$ 30.50 -3.40 13 2718.563 +14.0 12.5 RV = +10.5

RX J1158.5-7754a $0.30 \pm 0.04$ 30.93 -3.45 11 2713.656 +10.4 15.1 RV = +13.1

2718.614 +10.1 14.7

RX J1159.7-7601 $0.10 \pm 0.02$ 30.46 -3.58 10 2718.636 +15.1 10.2 RV = +13.1

RX J1201.7-7859 $0.20 \pm 0.02$ 30.76 -3.96 21 2712.734 +12.3 22.2 RV = +10.0

2718.678 +13.6 22.2 RV = +22.3

RX J1233.5-7523 7 2712.760 +14.8 7.2 RV = +14.0

2718.716 +16.0 6.9 RV = +15.1

RX J1239.4-7502 $0.19 \pm 0.02$ 30.72 -3.47 19 2713.675 +14.5 20.2 RV = +13.1

2718.726 +14.2 20.1

RX J1303.5-7701 2712.779 -121.1 Early-Type

RX J1307.3-7708 2712.794 -25.3 $\leq$ 6

Rho Ophiuchus :

RX J1627.1-2419 2712.852 -2.7

RX J1625.6-2613 2712.886 -3.5 17.0

CrA SFR :

CrAPMS 2 $0.08 \pm 0.02$ 29.93 -3.79 2.79 20 2713.909 -0.7 20.2 RV = -2.2,-1.2

2719.923 0.0 20.4 RV = -2.6

RX J1839.0-3726 17.8 2719.869 -1.6 9.8 RV = -4.8

RX J1853.1-3609 $0.19 \pm 0.04$ 30.28 -3.68 2719.837 -3.2 24.0

RX J1917.4-3756 $0.19 \pm 0.03$ 30.28 -3.82 2713.920 -0.9 28.1

2719.817 +0.5 28.3

CrAPMS 4SE <10 2719.901 -1.9 9.7 RV = -2.0

^a The standard RASS conversion factor, for negligible interstellar absorption, of 6 $\times$ 10^-12 erg cm^-2 count^-1 has been used.
^b These fluxes are lower limits, as it is unlikely that these stars represent a sample of unabsorbed X-ray emitters (see text).
^c For the ROSAT passband 0.1-2.4 keV.
^d Distances used for luminosity calculations: Lupus, d= 140 pc (Hughes et al. 1993; Bertout et al. 1999; de Zeeuw et al. 1999); Chamaeleon, d= 160 pc (Bertout et al. 1999; Rebull et al. 2004, and references therein); CrA SFR, d= 120 pc (Morraco & Rydgren 1981; Casey et al. 1998).
^e Lupus Vsini/Periods/RV data are taken from Wichmann et al. (1998, 1999); Chamaeleon Vsini/RV data are taken from Covino et al. (1997), Cutispoto et al. (2002) & Nordström et al. (2004); CrA SFR Vsini/RVs/Period data are taken from Neuhäuser et al. (2000), Franchini et al. (1992), Walter et al. (1997) & Shevchenko et al. (1995).

**Table 2:** An X-ray and kinematic data ensemble for each star detailed in Table 1.
TARGET	RASS X-ray^a,b,c	Log $L^{d}_{\rm x}$	Log ( $L_{\rm x}$ / $L_{\rm bol}$ )	$P_{\rm rot}$	$v \sin i$	HJD	RV	$v \sin i$	Comments^e
	ct rate [ct s^-1]	[erg s^-1]		[days]	[kms^-1]	(+2450000)	[kms^-1]	[kms^-1]
Lupus :
RX J1507.2-3505	$0.07 \pm 0.02$	29.99	-4.09		15.0	2713.762	+2.1	13.0	RV = +1.4
						2718.766	+2.2	13.2
RX J1507.4-4601	$0.06 \pm 0.02$	29.93	-3.30			2718.790	+6.9	21.7
RX J1515.7-3331	$0.10 \pm 0.02$	30.15	-3.61	2.28	25.0	2713.860	+1.1	22.3
						2718.925	+1.9	23.4
RX J1518.4-3738	$0.13 \pm 0.02$	30.26	-3.36	2.98	25.0	2718.746	+3.7	21.6	RV = +3.7
RX J1523.4-4055	$0.037 \pm 0.012$	29.71	-3.62	4.15	9.9	2719.769	+5.6	11.7	RV = +6.8
RX J1524.5-3652	$0.06 \pm 0.02$	29.93	-3.55	2.91	19.0	2713.826	+4.4	16.4	RV = +4.2
						2719.792	+4.6	17.6
RX J1525.0-3604	$0.13 \pm 0.02$	30.26	-3.44			2718.852	+4.8	23.2
RX J1529.6-3546	$0.11 \pm 0.02$	30.19				2718.879	+16.4	19.3	SB2
						2718.879	-11.3	19.5	SB2
RX J1529.7-3628	$0.06 \pm 0.02$	29.93				2719.715	+3.2	14.5
RX J1546.6-3618	$0.05 \pm 0.02$	29.85	-3.69		7.1	2713.705	+7.2	$\leq$ 6	RV = +2.5
						2719.747	+7.3	$\leq$ 6
RX J1547.6-4018	$0.06 \pm 0.01$	29.93	-3.67		10.0	2713.737	+3.1	11.8	RV = +2.8
						2718.916	+3.2	12.9
RX J1601.1-3320	$0.10 \pm 0.02$	30.15	-3.62	3.78	21.9	2713.799	+2.3	18.8	RV = +3.0
RX J1605.7-3905	$0.16 \pm 0.02$	30.35	-3.40			2713.780	+2.2	>50
RX J1608.9-3905					$\sim49$	2718.900	+9.7	30.4	RV = -0.6
						2718.900	-25.8	24.1	SB2
Chamaeleon I $\&$ II
RX J0850.1-7554	$0.17 \pm 0.02$	30.68	-3.30		45	2712.590	+17.1	49.4	RV = +15.5
						2718.521	+35.0	26.5	SB2?
						2718.521	-0.8	23.3	SB2?
RX J0951.9-7901	$0.17 \pm 0.02$	30.68	-3.54		73	2712.620	+39.8	49.0	RV = +12.2
						2712.620	-20.3	32.6	SB2?
						2718.533	+38.1	47.2	SB2?
						2718.533	-35.1	32.3	SB2?
RX J1112.7-7637	$0.08 \pm 0.02$	30.36	-3.31		11	2712.694	+13.6	30.7	RV = +16.0
						2718.546	+15.2	28.4
RX J1129.2-7546					20	2713.628	+15.9	20.8	RV = +11.4
						2719.528	+15.5	19.9
RX J1140.3-8321	$0.11 \pm 0.02$	30.50	-3.40		13	2718.563	+14.0	12.5	RV = +10.5
RX J1158.5-7754a	$0.30 \pm 0.04$	30.93	-3.45		11	2713.656	+10.4	15.1	RV = +13.1
						2718.614	+10.1	14.7
RX J1159.7-7601	$0.10 \pm 0.02$	30.46	-3.58		10	2718.636	+15.1	10.2	RV = +13.1
RX J1201.7-7859	$0.20 \pm 0.02$	30.76	-3.96		21	2712.734	+12.3	22.2	RV = +10.0
						2718.678	+13.6	22.2	RV = +22.3
RX J1233.5-7523					7	2712.760	+14.8	7.2	RV = +14.0
						2718.716	+16.0	6.9	RV = +15.1
RX J1239.4-7502	$0.19 \pm 0.02$	30.72	-3.47		19	2713.675	+14.5	20.2	RV = +13.1
						2718.726	+14.2	20.1
RX J1303.5-7701						2712.779	-121.1		Early-Type
RX J1307.3-7708						2712.794	-25.3	$\leq$ 6
Rho Ophiuchus :
RX J1627.1-2419						2712.852	-2.7
RX J1625.6-2613						2712.886	-3.5	17.0
CrA SFR :
CrAPMS 2	$0.08 \pm 0.02$	29.93	-3.79	2.79	20	2713.909	-0.7	20.2	RV = -2.2,-1.2
						2719.923	0.0	20.4	RV = -2.6
RX J1839.0-3726					17.8	2719.869	-1.6	9.8	RV = -4.8
RX J1853.1-3609	$0.19 \pm 0.04$	30.28	-3.68			2719.837	-3.2	24.0
RX J1917.4-3756	$0.19 \pm 0.03$	30.28	-3.82			2713.920	-0.9	28.1
						2719.817	+0.5	28.3
CrAPMS 4SE					<10	2719.901	-1.9	9.7	RV = -2.0

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