Improved non-LTE line formation calculations for hydrogen in O-stars are presented. The calculations are carried out by means of the method recently developed...

The physics of infrared emission processes is examined, taking into account black body radiation, radiation from dust particles, thermal plasma emission...

Based on ISO short-wavelength spectrograph (SWS)+long-wavelength spectrograph (LWS) observations, IRAS 16594-4656 is identified as a new member of the rare...

We present a study of 16 planetary nebulae (PNe) where fullerenes have been detected in their Spitzer Space Telescope spectra. This large sample of objects...

We present measurements of internal proper motions at more than 500 positions of NGC 2392, the Eskimo Nebula, based on images acquired with WFPC2 on board the...

We present internal proper motion measurements of more than five hundred positions of NGC 2392, based on images acquired with the WFPC2 on bord of the Hubble...

Aims: The intracluster light (ICL) is a faint diffuse stellar component of clusters made of stars that are not bound to individual galaxies. We have carried out...

We have imaged an empty area of 34×34 arcmin2 1.5d north of the Virgo Cluster core to survey for intracluster planetary nebula (PN) candidates. We have...

We have investigated the properties of the diffuse light in the Virgo Cluster core region, based on the detection of intracluster planetary nebulae (PNs) in...