4 papers
A long-duration superflare on the K giant HD 251108
Hans Moritz Günther, Dheeraj Pasham, Alexander Binks +10
Many giant stars are magnetically active, which causes rotational variability, chromospheric emission lines, and X-ray emission. Large outbursts in these emission features can set…
Sherpa: An Open Source Python Fitting Package
Aneta Siemiginowska, Douglas Burke, Hans Moritz Günther +8
We present an overview of Sherpa, an open source Python project, and discuss its development history, broad design concepts and capabilities. Sherpa contains powerful tools for com…
Concept of a Double Tilted Rowland Spectrograph for X-rays
Hans Moritz Günther, Casey T. DeRoo, Ralf K. Heilmann +1
High-resolution spectroscopy in soft X-rays ( keV) requires diffractive elements to resolve any astrophysically relevant diagnostics, such as closely spaced lines, weak absorpt…
The Nature of X-Rays from Young Stellar Objects in the Orion Nebula Cluster -- A Chandra HETGS Legacy Project
Norbert S. Schulz, David P. Huenemoerder, David A. Principe +10
The Orion Nebula Cluster (ONC) is the closest site of very young ( 1 Myrs) massive star formation. The ONC hosts more than 1600 young and X-ray bright stars with masses rangi…