X-ray observations from cosmic objects 4: stars

X-rays are a central ingredient moderating the gas chemistry of cosmic bodies in the universe. In this comparison a set of publications are presented from the field of X-ray Astronomy. This field has seen an increased interest since the launch of space observatories like Chandra X-ray Observatory and XMM - Newton. This is the fourth comparison of a set that covers X-ray observations on various cosmic body types: comets, https://orkg.org/comparison/R274032/ planets, https://orkg.org/comparison/R275000/, the sun, https://orkg.org/comparison/R282510/ ,the stars and warm-hot intergalactic medium. This set is also a direct evolution from published comparisons about the complementary topic of laboratory X-ray measurements in Highly Charged Ions (HCIs).