Context. The solar oxygen abundance has undergone a major downward revision in the
past decade, the most noticeable one being the update including 3D hydrodynamical …

Context. Carbon-enhanced metal-poor stars (CEMP) form a significant proportion of the
metal-poor stars, their origin is not well understood, and this carbon-enhancement appears …

Context. The origin of carbon-enhanced metal-poor stars enriched with both s and r
elements is highly debated. Detailed abundances of these types of stars are crucial to …

We give an extensive primer on roAp stars-introducing them, putting them in context and
explaining terminology and jargon, and giving a thorough discussion of what is known and …

Current problems encountered in the spectroscopic determination of photospheric
abundances are outlined and exemplified in a reevaluation of C, N, O, Ne, Mg, Si, and Fe …

We have performed non-LTE calculations for OI with a multilevel model atom using currently
available atomic data for a set of parameters corresponding to stars of spectral types from A …

We performed a non-local thermodynamic equilibrium (NLTE) analysis of the infrared
oxygen triplet for a large number of Cepheid spectra obtained with the Hobby–Eberly …

Context. Elemental correlations and anti-correlations are known to be present in globular
clusters (GCs) owing to pollution by CNO cycled gas. Because of its fragility Li is destroyed …

The literature on the $\lambda $ Boo stars has grown to become somewhat heterogenous,
as different authors have applied different criteria across the UV, optical and infrared regions …

The λ Bootis stars are Population I, late B-to early F-type stars, with moderate to extreme (up
to a factor 100) surface underabundances of most Fe-peak elements and solar abundances …