Context. The Kepler spacecraft is providing time series of photometric data with
micromagnitude precision for hundreds of AF type stars. Aims. We present a first general …

We review a large body of available meteoritic and stellar halogen data in the literature used
for solar system abundances (ie, representative abundances of the solar system at the time …

This is the first in a series of papers in which we describe and report the analysis of a large
survey of Herbig Ae/Be stars in circular spectropolarimetry. Using the ESPaDOnS and …

Spiral arm structures seen in scattered-light observations of protoplanetary disks can
potentially serve as signposts of planetary companions. They can also lend unique insights …

Aims. In the framework of the GAPS project, we observed the planet-hosting star KELT-9 (A-
type star, v sin i~ 110 km s− 1) with the HARPS-N spectrograph at the Telescopio Nazionale …

The photospheres of about 10–20 per cent of main-sequence A-and B-type stars exhibit a
wide range of chemical peculiarities, often associated with the presence of a magnetic field …

Non-local thermodynamical equilibrium (NLTE) line formation for Mg i and Mg ii lines is
considered in classical 1D LTE model atmospheres of the Sun and 17 stars with reliable …

We construct a model atom for Ti i–ii using more than 3600 measured and predicted energy
levels of Ti i and 1800 energy levels of Ti ii, and quantum mechanical photoionization cross …

ABSTRACT A comprehensive model atom was developed for Si i–ii–iii using the most up-to-
date atomic data available so far. Based on non-local thermodynamic equilibrium (NLTE) …

The knowledge of accurate stellar parameters is paramount in several fields of stellar
astrophysics, particularly in the study of extrasolar planets, where often the star is the only …