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Revised ephemeris and orbital period derivative of the supersoft X-ray source CAL 87 based on 34 yr of observations
Saito, R. K.; Oliveira, A. S.; D'Amico, F. +4 more
In this study, we present an analysis of over 34 yr of observational data from CAL 87, an eclipsing supersoft X-ray source. The primary aim of our study, which combines previously analysed measurements as well as unexplored publicly available data sets, is to examine the orbital period evolution of CAL 87. After meticulously and consistently deter…
Multispacecraft Energetic Particle Enhancements Associated with a Single Corotating Interaction Region
Desai, M. I.; Dayeh, M. A.; Elliott, H. A. +3 more
The radial evolution of particles accelerated at corotating interaction regions (CIRs) is not fully understood, particularly the distance range over which this particle acceleration occurs and how the energy spectra are modulated by transport through the inner heliosphere. Here, we present observations of energetic proton enhancements associated w…
A study of Be stars in the time domain - I. Spectral data and polarimetry
Steele, Iain A.; Jermak, Helen E.; Castañón Esteban, Adrian
We present the first part of a spectroscopic and polarimetric study on a sample of 58 Be stars that have been measured since 1998. The aim of the study is to understand the time-scales of disc variability, formation, and dissipation as a function of the properties (mass, luminosity, and rotational velocity) of the underlying B star. In this paper,…
The AMBRE Project: Lead abundance in Galactic stars
Recio-Blanco, A.; de Laverny, P.; Contursi, G. +4 more
Context. The chemical evolution of neutron capture elements in the Milky Way is still a matter of debate. Although more and more studies investigate their chemical behaviour, there is still a lack of a significant large sample of abundances of a key heavy element: lead. Aims. Lead is the final product of the s-process nucleosynthesis channel and i…
Water ice concentration and distribution in the Martian south polar layered deposits constrained by the lateral variations of their bulk density
Mitri, Giuseppe; Genova, Antonio; Sulcanese, Davide +4 more
Records of Mars' climate history have been preserved by the ice-rich south polar layered deposits. An accurate knowledge of their properties is key to understanding the evolution of Mars. The combination of geophysical measurements, including gravity, altimetry and radar sounding, enables constraints on the density and composition of the south pol…
The Role and Lifetime of Dissociative Heterogeneous Processes in Improving Simulated Ozone on Mars
Patel, M. R.; Mason, J. P.; Lefèvre, F. +4 more
Ozone simulated in Mars Global Climate Models (MGCMs) is used to assess the underlying chemistry occurring in the atmosphere. Currently, ozone total column abundance (TCA) is under-predicted in MGCMs by up to 120%, implying missing or inaccurate chemistry in models. Heterogeneous reactions of hydroxyl radicals (HOX) have been offered as…
Are There Local Dynamos Acting in Sunspot Regions?
Wang, Jingxiu; Jin, Chunlan; Ji, Haisheng +1 more
In solar physics, a long-unanswered question is whether or not there are local dynamos acting in sunspot regions. Here we report an observed pattern of magnetic evolution that makes the sunspots alive with ample complexity and energy. This anomalous pattern manifests as peculiar bipolar magnetic emergences (BMEs), exhibiting the following characte…
Cross-correlation of Luminous Red Galaxies with Machine Learning Selected Active Galactic Nuclei in HSC-SSP: Unobscured AGN Residing in More Massive Halos
Strauss, Michael A.; Greene, Jenny E.; Goulding, Andy D. +7 more
Active galactic nuclei (AGN) are the signposts of black hole growth, and likely play an important role in galaxy evolution. An outstanding question is whether AGN of different spectral types indicate different evolutionary stages in the coevolution of black holes and galaxies. We present the angular correlation function between an AGN sample selec…
Atmospheric Parameters and Abundances of Cool Red Giant Stars
Dencs, Z.; Derekas, A.; Mitnyan, T. +10 more
Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to probe the farthest parts of our Galaxy. Our goal is to determine the chemical composition of 21 RGB stars with T eff < 4200 K selected from the APOGEE-2 DR17 database using n…
European VLBI Network observations of the peculiar radio source 4C 35.06 overlapping with a compact group of nine galaxies
An, T.; Gabányi, K. É.; Frey, S. +8 more
Context. According to the hierarchical structure formation model, brightest cluster galaxies (BCGs) evolve into the most luminous and massive galaxies in the Universe through multiple merger events. The peculiar radio source 4C 35.06 is located at the core of the galaxy cluster Abell 407, overlapping with a compact group of nine galaxies. Low-freq…