the range . The hard component of the X-ray spectrum from ? Sco as studied with XMM-Newton supports the presence of in-falling clumps of plasma in ? Sco.

Tau Scorpii star is a proper motion member of the Upper Scorpius subgroup of theScorpius-Centaurus OB association,the nearest such co-moving association of massive stars to the Sun. The Upper Scorpius subgroup