Search Publications
GIADA microbalance measurements on board Rosetta: submicrometer- to micrometer-sized dust particle flux in the coma of comet 67P/Churyumov-Gerasimenko
Fulle, M.; Della Corte, V.; Rotundi, A. +7 more
Context. From August 2014 to September 2016, Rosetta escorted comet 67P/Churyumov-Gerasimenko (67P) during its journey around the Sun. One of the aims of Rosetta was to characterize cometary activity and the consequent formation of dust flux structures in cometary comae.
Aims: We characterize and quantify the submicrometer- to micrometer-size…
A spatio-kinematic model for jets in post-AGB stars
De Marco, O.; Van Winckel, H.; Kamath, D. +1 more
Aims: We aim to determine the geometry, density gradient, and velocity structure of jets in post-asymptotic giant branch (post-AGB) binaries.
Methods: Our high cadence time series of high-resolution optical spectra of jet-creating post-AGB binary systems provide us with a unique tomography of the jet. We determine the spatio-kinematic st…
Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC 10
Lebouteiller, V.; Madden, S. C.; Galliano, F. +9 more
Context. Star formation activity is an important driver of galaxy evolution and is influenced by the physical properties of the interstellar medium. Dwarf galaxies allow us to understand how the propagation of radiation and the physical conditions of the different ISM phases are affected by the low-metallicity environment.
Aims: Our objective…
Collimated radiation in SS 433. Constraints from spatially resolved optical jets and Cloudy modeling of the optical bullets
Dexter, Jason; Waisberg, Idel; Dubus, Guillaume +2 more
Context. The microquasar SS 433 is well known for its precessing, relativistic, and highly collimated baryonic jets, which manifest in its optical spectrum as pairs of hydrogen and helium emission lines moving with large Doppler shifts. Depending on their heating mechanism, the optical jet bullets may serve as a probe of the collimated radiation c…
Young stellar populations in early-type dwarf galaxies. Occurrence, radial extent, and scaling relations
Peletier, R. F.; Valentijn, E. A.; Hamraz, E. +3 more
Aims: To understand the stellar population content of early-type dwarf galaxies (dEs) and their environmental dependence, we compare the slopes and intrinsic scatter of color-magnitude relations (CMRs) for three nearby clusters, Fornax, Virgo, and Coma. Additionally, we present and compare internal color profiles of these galaxies to identify…
Massive dust clumps in the envelope of the red supergiant VY Canis Majoris
Kamiński, T.
The envelope of the red supergiant VY CMa has long been considered an extreme example of episodic mass loss that is possibly taking place in other cool and massive evolved stars. Recent (sub-)millimeter observations of the envelope revealed the presence of massive dusty clumps within 800 mas of the star and reinforce the picture of drastic mass-lo…
Nature of a shell of young stars in the outskirts of the Small Magellanic Cloud
Bell, Eric F.; Carballo-Bello, Julio A.; Grebel, Eva K. +36 more
Context. Understanding the evolutionary history of the Magellanic Clouds requires an in-depth exploration and characterization of the stellar content in their outer regions, which ultimately are key to tracing the epochs and nature of past interactions.
Aims: We present new deep images of a shell-like overdensity of stars in the outskirts of …
Exploring the dimming event of RW Aurigae A through multi-epoch VLT/X-shooter spectroscopy
Ray, T. P.; Coffey, D.; Natta, A. +6 more
Context. RW Aur A is a classical T Tauri star that has suddenly undergone three major dimming events since 2010. The reason for these dimming events is still not clear.
Aims: We aim to understand the dimming properties, examine accretion variability, and derive the physical properties of the inner disc traced by the CO ro-vibrational emission…
Overview of non-transient γ-ray binaries and prospects for the Cherenkov Telescope Array
Walter, R.; Sidoli, L.; La Palombara, N. +20 more
Aims: Despite recent progress in the field, there are still many open questions regarding γ-ray binaries. In this paper we provide an overview of non-transient γ-ray binaries and discuss how observations with the Cherenkov Telescope Array (CTA) will contribute to their study.
Methods: We simulated the spectral behaviour of the non-transi…
Stellar population astrophysics (SPA) with the TNG. GIANO-B spectroscopy of red supergiants in Alicante 7 and Alicante 10
Dalessandro, E.; Rainer, M.; Bragaglia, A. +6 more
Aims: The Scutum complex in the inner disk of the Galaxy hosts a number of young clusters and associations of red supergiant stars that are heavily obscured by dust extinction. These stars are important tracers of the recent star formation and chemical enrichment history in the inner Galaxy.
Methods: Within the SPA Large Programme at the…