Search Publications
The Gaia-ESO Survey: Probing the lithium abundances in old metal-rich dwarf stars in the solar vicinity
Gilmore, G.; Guiglion, G.; Chiappini, C. +14 more
Context. Lithium (Li) is a fragile element that is produced in a variety of sites but can also be very easily depleted in stellar photospheres. Radial migration has been reported to explain the decrease in the upper envelope of Li measurements observed for relatively old metal-rich dwarf stars in some surveys.
Aims: We test a scenario in whic…
Ground-based HCN submillimetre measurements in Titan's atmosphere: an intercomparison with Herschel observations
Shulyak, D.; Hartogh, P.; Moreno, R. +4 more
Aims: The aim of this study is to measure the vertical distribution of HCN on Titan's stratosphere using ground-based submillimetre observations acquired quasi-simultaneously with the Herschel ones. This allows us to perform a consistency check between space and ground-based observations and to build a reference mean HCN vertical profile in T…
Magnetic field structure of OMC-3 in the far infrared revealed by SOFIA/HAWC+
Wolf, S.; Zielinski, N.
We report the SOFIA/HAWC+ band D (154 µm) and E (214 µm) polarimetric observations of the filamentary structure OMC-3 that is part of the Orion molecular cloud. The polarization pattern is uniform for both bands and parallel to the filament structure. The polarization degree decreases toward regions with high intensity for both bands, …
X-ray activity of the young solar-like star Kepler-63 and the structure of its corona
Orlando, S.; Stelzer, B.; Coffaro, M.
The X-ray satellite XMM-Newton has so far revealed coronal cycles in seven solar-like stars. Of these, the youngest stars ϵ Eridani (~400 Myr) and ι Horologii (~600 Myr) display the shortest X-ray cycles and the smallest amplitudes, defined as the variation of the X-ray luminosity between the maximum and minimum of the cycle. The X-ray cycle of ϵ …
Turin-SyCAT: A multifrequency catalog of Seyfert galaxies
Capetti, A.; Masetti, N.; Chavushyan, V. +3 more
Aims: We present the first release of Turin-SyCAT, a multifrequency catalog of Seyfert galaxies.
Methods: We selected Seyfert galaxies considering criteria based on radio, infrared, and optical properties and starting from sources belonging to hard X-ray catalogs and surveys. We visually inspected optical spectra available for all select…
Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters
Bica, E.; Barbuy, B.; Cassisi, S. +6 more
Context. RR Lyrae stars are useful standard candles allowing one to derive accurate distances for old star clusters. Based on the recent catalogues from OGLE-IV and Gaia Early Data Release 3 (EDR3), the distances can be improved for a few bulge globular clusters.
Aims: The aim of this work is to derive an accurate distance for the following s…
The Gaia-ESO Survey: Chemical tagging in the thin disk. Open clusters blindly recovered in the elemental abundance space
Gilmore, G.; Vallenari, A.; Randich, S. +14 more
Context. The chemical makeup of a star provides the fossil information of the environment where it formed. Under this premise, it should be possible to use chemical abundances to tag stars that formed within the same stellar association. This idea - known as chemical tagging - has not produced the expected results, especially within the thin disk …
A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +82 more
Context. Stellar occultation is a powerful technique that allows the determination of some physical parameters of the occulting object. The result depends on the photometric accuracy, the temporal resolution, and the number of chords obtained. Space telescopes can achieve high photometric accuracy as they are not affected by atmospheric scintillat…
X-raying the Sco-Cen OB association: The low-mass stellar population revealed by eROSITA
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument on board the Spectrum-Roentgen-Gamma observatory of the Sco-Cen OB association. Bona fide Sco-Cen member stars are young and are therefore expected to emit X-rays at the saturation level. The sensitivity limit of eRASS1 makes these stars detectabl…
Analysis of multiscale structures at the quasi-perpendicular Venus bow shock. Results from Solar Orbiter's first Venus flyby
Maksimovic, M.; Bale, S. D.; Chust, T. +23 more
Context. Solar Orbiter is a European Space Agency mission with a suite of in situ and remote sensing instruments to investigate the physical processes across the inner heliosphere. During the mission, the spacecraft is expected to perform multiple Venus gravity assist maneuvers while providing measurements of the Venusian plasma environment. The f…