Search Publications
Evolution of coronal hole solar wind in the inner heliosphere: Combined observations by Solar Orbiter and Parker Solar Probe
Perri, S.; Lavraud, B.; Maksimovic, M. +18 more
We study the radial evolution, from 0.1 AU to the Earth, of a homogeneous recurrent fast wind, coming from the same source on the Sun, by means of new measurements by both Solar Orbiter and Parker Solar Probe. With respect to previous radial studies, we extend, for the first time, the analysis of a recurrent fast stream at distances never reached …
WD 1145+017: Alternative models of the atmosphere, dust clouds, and gas rings
Budaj, J.; Hubeny, I.; Maliuk, A.
Context. WD 1145+017 (WD1145) is the first white dwarf known to be orbited by disintegrating exoasteroids. It is a DBZ-type white dwarf with strongly variable broad circumstellar lines and variable shallow ultraviolet (UV) transits. Various models of the dust clouds and gaseous rings have been proposed as an explanation for this behavior.
Aim…
Nano-grain depletion in photon-dominated regions
Abergel, A.; Ysard, N.; Habart, E. +3 more
Context. Carbonaceous nano-grains play a fundamental role in the physico-chemistry of the interstellar medium (ISM) and especially of photon-dominated regions (PDRs). Their properties vary with the local physical conditions and affect the local chemistry and dynamics.
Aims: We aim to highlight the evolution of carbonaceous nano-grains in thre…
J-PLUS: Detecting and studying extragalactic globular clusters. The case of NGC 1023
Cortesi, Arianna; Chies-Santos, Ana L.; Forbes, Duncan A. +19 more
Context. Extragalactic globular clusters (GCs) are key objects in studies of galactic histories. The advent of wide-field surveys, such as the Javalambre Photometric Local Universe Survey (J-PLUS), offers new possibilities for the study of these systems.
Aims: We performed the first study of GCs in J-PLUS to recover information on the history…
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…