The High Angular Resolution Monolithic Optical and Near-infrared Integral field spectrograph (HARMONI) is a first generation instrument designed for the...

The non-thermal jet emission in active galactic nuclei covers several orders of magnitude in the frequency range. Hence the observational approach needs multi...

The European Solar Telescope (EST) aims to become the most ambitious ground-based solar telescope in Europe. Its roots lie in the knowledge and expertise gained...

The determination of oxygen abundance in nebulae requires measuring a significant number of emission lines distributed along a wide spectral range. The required...

We present the oxygen abundance determination for 90 HII regions in the inner parts of the grand design galaxy M101. The abundances were derived employing the P...

This study has been published in Sánchez-Menguiano et al. (2018). We encourage the reader to that article for more details on the study and the results.

Oxygen abundances have been derived in a sample of very metal-poor stars using the O I triplet at λλ7771-5 Å and OH lines in the near UV. A detailed NLTE...

The reliability of oxygen abundances derived from OH UV lines in metal-poor dwarf stars is discussed in the light of the stellar parameters adopted and the...

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