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Table 7.

Physical parameters used.

Parameter T Tau TW Hya HD 163296
normalized EM (1052 cm−3) 50 [1] 7 [2] 4.4 [3]
Spot covering fraction (%) 3 [4] 3 [5] 8 [6]
Spot radius (1010 cm) 9 2 9
log X-ray densitya <10.4 11.8 <10.4
log pre-shock densityb 9.5 11.3 9.5
vshock (km/s) 400 500 450
dcool (108 cm) 49 2.1 83
Vertical height (108 cm) 2.1 × 103 1.5 171
Associated acc (10−10 M yr−1) 1.1 4.3 1.4
Typical acc (10−9 M yr−1) 100 a few a few 100

Notes. References are provided in square brackets.

a

Measured from the O VII triplet.

b

Based on the post-shock density from the O VII triplet.

References. [1] This work; [2] Brickhouse et al. (2010); [3] Günther & Schmitt (2009); [4] Calvet et al. (2004); [5] Batalha et al. (2002); [6] Mendigutía et al. (2013).

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