Context. Nearby isolated planetary mass objects are beginning to be discovered, but their individual properties are poorly constrained because their low surface temperatures and strong molecular self-absorption make them extremely faint. Aims: We aimed to detect the near-infrared emission of the coldest brown dwarf (BD) found so far, WISE0855-0714

The authors present two new methods to determine the electron temperature based on the He I line intensities. The temperatures derived from these methods are considerably smaller than those derived from the [O III] λλ4363, 5007 line intensities and imply the presence of large spatial temperature fluctuations in PNe. Considering the presence of

Context. Localized strongly Doppler-shifted Stokes V signals were detected by IMaX/SUNRISE. These signals are related to newly emerged magnetic loops that are observed as linear polarization features. Aims: We aim to set constraints on the physical nature and causes of these highly Doppler-shifted signals. In particular, the temporal relation

A new mid-infrared array camera has been recently put in operation with the 2.1 m telescope of the OAN at San Pedro Martir, Mexico. Calibrated 8.7, 9.8 and 12.5 micron images of a number of ultracompact HII regions and other less massive young stellar objects were obtained during the first two scientific runs with this instrument. Photometry and

We present high signal-to-noise ratio integrated spectra of 24 star clusters in the Large Magellanic Cloud (LMC), obtained using the FLAIR spectrograph at the UK Schmidt telescope. The spectra have been placed on to the Lick/IDS system in order to test the calibration of Simple Stellar Population (SSP) models. We have compared the SSP-predicted

Aims: The nearby, bright, almost completely unreddened Type Ia supernova 2011fe in M101 provides a unique opportunity to test both the precision and the accuracy of the extragalactic distances derived from SNe Ia light curve fitters. Methods: We applied the current, public versions of the independent light curve fitting codes MLCS2k2 and SALT2 to