X-ray emission from stars in the cool half of the Hertzsprung-Russell diagram is generally
attributed to the presence of a magnetic corona that contains plasma at temperatures …

Non-degenerate stars of essentially all spectral classes are soft X-ray sources. Their X-ray
spectra have been important in constraining physical processes that heat plasma in stellar …

We present high-resolution X-ray spectra of the X-ray–bright classical T Tauri star, TW
Hydrae, covering the wavelength range of 1.5–25 Å. The differential emission measure …

The Sun's magnetic activity has steadily declined during its main-sequence life. While the
solar photospheric luminosity was about 30% lower 4.6 Gyr ago when the Sun arrived on …

ABSTRACT The Orion Nebula Cluster and the molecular cloud in its vicinity have been
observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23 hr …

We discuss models for coronal abundance anomalies observed in the coronae of the sun
and other late-type stars following a scenario first introduced by Schwadron, Fisk, & …

The interior structure of the Sun can be studied with great accuracy using observations of its
oscillations, similar to seismology of the Earth. Precise agreement between …

▪ Abstract The launches of the Chandra X-Ray Observatory in June 1999 and the XMM-
Newton Observatory in December 1999 opened a new era in X-ray astronomy. Both of these …

We investigate the long-term evolution of X-ray coronae of solar analogs based on high-
resolution X-ray spectroscopy and photometry with XMM-Newton. Six nearby main …

We investigate the EUV and X-ray flare rate distribution in radiated energy of the late-type
active star AD Leo. Occurrence rates of solar flares have previously been found to be …