Photoionizing radiation and stellar winds from massive stars deposit energy and momentum
into the interstellar medium (ISM). They might disperse the local ISM, change its turbulent …

Context. In recent years, winds from massive stars have been considered promising sites for
investigating relativistic particle acceleration. In particular, the resulting bow-shaped shocks …

The Bubble Nebula (or NGC 7635) is a parsec-scale seemingly spherical wind-blown
bubble around the relatively unevolved O star BD+ 60° 2522. The young dynamical age of …

Mid-infrared arcs of dust emission are often seen near ionizing stars within H ii regions. A
possible explanations for these arcs is that they could show the outer edges of asymmetric …

We present a multiwavelength study of the iconic Bubble Nebula (NGC 7635) and its
ionizing star BD+ 60○ 2522. We obtained XMM–Newton EPIC X-ray observations to search …

We present new results on the chemical composition of the Galactic ring nebula NGC 6888
surrounding the WN6 (h) star WR136. The data are based on deep spectroscopical …

Abstract We present Hubble Space Telescope observations of the northern part of NGC
7635, a circular shell around the O6. 5 IIIf star BD+ 60 2522. The nebula, which lies within …

We present the results of long-slit spectroscopy in several slit positions that cover different
morphological structures of the central parts of three bright Galactic H ii regions: M8, M17 …

We report the analysis of a long term observing campaign designed to monitor the
spectroscopic variability of the Oef star BD+ 60° 2522. We find that the double-peaked He ii …

We report the results of spectroscopic observations and numerical modelling of the H ii
region IRAS 18153− 1651. Our study was motivated by the discovery of an optical arc and …