X-ray and ultraviolet (UV) observations of the outer solar atmosphere have been used for
many decades to measure the fundamental parameters of the solar plasma. This review …

Using ab-initio photoionization models of giant H ii regions, we test methods for abundance
determinations based on a direct measurement of the electron temperature, now possible …

This work focuses on the gas chemical composition of CGCG007-025. This compact dwarf is
undergoing a galaxy wide star-forming burst, whose spatial behaviour has been observed …

Context. Recent JWST observations of the Type Ia supernova (SN Ia) 2021aefx in the
nebular phase have paved the way for late-time studies covering the full optical to mid …

CHIANTI provides a database of atomic energy levels, wavelengths, radiative transition
probabilities, and electron excitation data for a large number of ions of astrophysical interest …

We have compiled a large sample of O, Ne, S, Cl, and Ar abundances that have been
determined for 85 Galactic planetary nebulae in a consistent and homogeneous manner …

In this paper we review the spectroscopic diagnostic techniques that can be applied to XUV
observations of active stars. In particular, we discuss methods for the determination of …

The primordial helium abundance YP is calculated using sulphur as metallicity tracer in the
classical methodology (with YP as an extrapolation of Y to zero metals). The calculated …

ABSTRACT Extreme ultraviolet (EUV; 13.6 eV< hν≲ 100 eV) and X-rays in the 0.1–2 keV
band can heat the surfaces of disks around young, low-mass stars to thousands of degrees …

This work presents a Bayesian algorithm to fit the recombination and collisionally excited
line spectra of gas photoionized by clusters of young stars. The current model consists of 14 …