Aims: We have selected the Galactic H ii region M 43, a close-by apparently spherical nebula ionized by a single star (HD 37061, B0.5 V) to investigate several...
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PublicationA detailed study of the H ii region M 43 and its ionizing star
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PublicationA diffuse tidal dwarf galaxy destined to fade out as a "dark galaxy"
We have explored the properties of a peculiar object detected in deep optical imaging and located at the tip of an H I tail emerging from Hickson Compact Group...
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PublicationA distinct magnetic property of the inner penumbral boundary. II. Formation of a penumbra at the expense of a pore
Context. We recently presented evidence that stable umbra-penumbra boundaries are characterised by a distinct canonical value of the vertical component of the...
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PublicationA distinct magnetic property of the inner penumbral boundary. II. Formation of a penumbra at the expense of a pore
Context. We recently presented evidence that stable umbra-penumbra boundaries are characterised by a distinct canonical value of the vertical component of the...
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PublicationA double stellar generation in the globular cluster NGC 6656 (M 22). Two stellar groups with different iron and s-process element abundances
We present a chemical abundance analysis based on high resolution UVES spectra of seventeen bright giant stars in the Globular Cluster (GC) M 22. We obtained an...
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PublicationA dynamic view of V Hydrae. Monitoring of a spectroscopic-binary AGB star with an alkaline jet
Context. The well studied carbon star V Hydrae is known to exhibit a complex asymmetric environment made of a dense equatorial wind and high-velocity outflows...
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PublicationA dynamical study of the circumstellar gas in UX Orionis
We present the results of a high spectral resolution (lambda / Delta lambda = 49 000) study of the circumstellar (CS) gas around the intermediate mass, pre-main...
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PublicationA fast version of the k-means classification algorithm for astronomical applications
Context. K-means is a clustering algorithm that has been used to classify large datasets in astronomical databases. It is an unsupervised method, able to cope...
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PublicationA fast, very-high-energy γ-ray flare from BL Lacertae during a period of multi-wavelength activity in June 2015
The mechanisms producing fast variability of the γ-ray emission in active galactic nuclei (AGNs) are under debate. The MAGIC telescopes detected a fast, very...