Search Publications
A young spectroscopic binary in a quintuple system part of the Local Association
Murgas, Felipe; Jeffers, Sandra V.; McCully, Curtis +9 more
Context. Double-lined spectroscopic (SB2) binaries allow us to obtain a direct determination of the masses of their components, which is essential to test stellar models. Although these objects only provide a lower limit for the mass, they are more abundant than their eclipsing counterparts as they are not as strongly limited by the inclination of…
LBV phenomenon and binarity: The environment of HR Car
Mehner, A.; de Wit, W. -J.; Agliozzo, C. +7 more
Luminous blue variable stars (LBVs) are of great interest in massive-star evolution as they experience very high mass-loss episodes within short periods of time. HR Car is a famous member of this class in the Galaxy. It has a large circumstellar nebula and has also been confirmed as being in a binary system. One means of gaining information about …
Solar Orbiter observations of the structure of reconnection outflow layers in the solar wind
Lewis, G. R.; Fedorov, A.; Livi, S. +22 more
We briefly review an existing model of the structure of reconnection layers which predicts that several more distinct layers, in the form of contact discontinuities, rotational Alfvèn waves, or slow shocks, should be identifiable in solar wind reconnection events than are typically reported in studies of reconnection outflows associated with bifur…
Purveyors of fine halos. III. Chemical abundance analysis of a potential ωCen associate
Hanke, Michael; Hansen, Camilla Juul; Bonifacio, Piercarlo +3 more
Globular clusters (GCs) are important donors to the build-up of the Milky Way (MW) stellar halo, having contributed at the ten percent level over the Galactic history. Stars that originated from the second generation of dissolved or dissolving clusters can be readily identified via distinct light-element signatures such as enhanced N and Na and si…
Gaseous nebulae and massive stars in the giant H I ring in Leo
Venturi, Giacomo; Cresci, Giovanni; Thilker, David +2 more
Context. Chemical abundances in the Leo ring, the largest H I cloud in the local Universe, have recently been determined to be close to or above Solar values. This is a finding that is incompatible with prior claims that the ring was primordial in origin. The gas, pre-enriched in a galactic disk and tidally stripped, did not manage to efficiently …
Revised planet brightness temperatures using the Planck/LFI 2018 data release
Tomasi, Maurizio; Romelli, Erik; Maris, Michele +7 more
Aims: We present new estimates of the brightness temperatures of Jupiter, Saturn, Uranus, and Neptune based on the measurements carried in 2009-2013 by Planck/LFI at 30, 44, and 70 GHz and released to the public in 2018. This work extends the results presented in the 2013 and 2015 Planck/LFI Calibration Papers, based on the data acquired in 2…
Astrometric measurement and reduction of Pulkovo photographic observations of the main Saturnian satellites from 1972 to 2007 in the Gaia reference frame
Narizhnaya, N. V.; Apetyan, A. A.; Bikulova, D. A. +3 more
Context. We present a remeasurement of old photographic plates, providing important raw data for dynamical studies of the Saturnian satellite system. The unprecedentedly accurate realization of the Gaia reference frame allows us to make a precise calibration of digitized astronegatives of the Saturnian satellite images.
Aims: We reprocessed 3…
Abundance of barium in the atmospheres of red giants in the Galactic globular cluster NGC 104 (47 Tuc)
Korotin, S.; Kučinskas, A.; Kolomiecas, E. +2 more
Context. While most (if not all) Type I Galactic globular clusters (GGCs) are characterised by spreads in the abundances of light chemical elements (e.g. Li, N, O, Na, Mg, Al), it is not yet well established whether similar spreads may exist in s-process elements as well.
Aims: We investigated the possible difference in Ba abundance between t…
Capturing dual AGN activity and kiloparsec-scale outflows in IRAS 20210+1121
Fiore, F.; Vignali, C.; Piconcelli, E. +8 more
The most standard scenario for the evolution of massive galaxies across cosmic time assumes a correspondence based on the interplay between active galactic nuclei (AGN) feedback, which injects large amounts of energy into the host environment, and galaxy mergers, with their ability to trigger massive star formation events and accretion onto superm…
Detection of volatiles undergoing sublimation from 67P/Churyumov-Gerasimenko coma particles using ROSINA/COPS. II. The nude gauge
Altwegg, K.; Balsiger, H.; Rubin, M. +5 more
Context. In an earlier study, we reported that the ram gauge of the COmet Pressure Sensor (COPS), one of the three instruments of the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA), could be used to obtain information about the sublimating content of icy particles, made up of volatiles and conceivably refractories coming from c…