Table 5: X-ray luminosities and luminosity ratios from EINSTEIN, ROSAT and XMM observations of HD 159176. Luminosities are calculated for a 1.5 kpc distance. The Obs. CR column gives the count rates from Chlebowski et al. (1989) and Berghöfer et al. (1996) respectively for EINSTEIN and ROSAT, as well as our value for EPIC-pn. The Th. CR column provides the theoretical count rates calculated on the basis of the individual instrument response matrices for the 3 component model of Table 4 (see text).
Satellite $L_{\rm X}$ $L_{\rm X}$ / $L_{\rm bol}$ Obs. CR Th. CR

(erg s^-1) (cts s^-1) (cts s^-1)

EINSTEIN $4.33\times10$ ³³ $2.89\times10^{-6}$ 0.157 0.138

ROSAT $8.43\times10$ ³² $5.64\times10^{-7}$ 0.291 0.287

XMM $1.48\times10$ ³³ $9.93\times10^{-7}$ 1.303 1.328

**Table 5:** X-ray luminosities and luminosity ratios from *EINSTEIN*, *ROSAT* and *XMM* observations of HD 159176. Luminosities are calculated for a 1.5 kpc distance. The Obs. CR column gives the count rates from Chlebowski et al. (1989) and Berghöfer et al. (1996) respectively for *EINSTEIN* and *ROSAT*, as well as our value for EPIC-pn. The Th. CR column provides the theoretical count rates calculated on the basis of the individual instrument response matrices for the 3 component model of Table 4 (see text).
Satellite	$L_{\rm X}$	$L_{\rm X}$ / $L_{\rm bol}$	Obs. CR	Th. CR
	(erg s^-1)		(cts s^-1)	(cts s^-1)
EINSTEIN	$4.33\times10$ ³³	$2.89\times10^{-6}$	0.157	0.138
ROSAT	$8.43\times10$ ³²	$5.64\times10^{-7}$	0.291	0.287
XMM	$1.48\times10$ ³³	$9.93\times10^{-7}$	1.303	1.328

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