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The Radiative–Convective Gap: Fact or Fiction?
Brandner, Wolfgang; Röser, Siegfried; Schilbach, Elena +1 more
Gaia characterizes the stellar populations of nearby open clusters with unprecedented precision. We investigate the Böhm-Vitense gap, which has been found as a prominent feature in the stellar sequence of open clusters. Using PARSEC isochrone fitting, we derive astrophysical parameters for more than 1100 bona fide single stars each in Praesepe, id…
Perturbation effect of solar radiation pressure on the Sun-Earth co-orbital motion
Zhao, Mingxu; Qi, Yi; Qiao, Dong
Sun-Earth co-orbital motions have an important value in deep space explorations due to their unique orbital characteristics and spatial configurations. In this paper, we investigate the influence of the solar radiation pressure (SRP) on the Sun-Earth co-orbital motion. Firstly, we derive several analytical formulas of the effect of the SRP on orbi…
Infrared colours and bolometric corrections of SiO masing stars in the inner Milky Way
Messineo, Maria
Aims: We analysed a sample of SiO-masing late-type stars located in the inner Galaxy with the goal of setting better constraints on their obscuration.
Methods: This reference sample has allowed us to define mathematical relations between their dereddened infrared colours and the observed colours (e.g. Ks-[8], Ks-[24…
Current and secular accretion rates of EX Hydrae
Beuermann, K.; Reinsch, K.
We report an observed accretion rate of Ṁ1 = (3.86 ± 0.60) × 10−11 M⊙ yr−1 for the white dwarf in the short-period, intermediate polar
High-latitude Observations of Dissipation-range Turbulence by the Ulysses Spacecraft during the Solar Minimum of 1993–96: The Spectral Break and Anisotropy
Isenberg, Philip A.; Schwadron, Nathan A.; Murphy, Neil +6 more
We examine Ulysses magnetic field observations from 1993 to 1996 as the spacecraft made its first fast-latitude scan from the southern to the northern hemisphere. Most of the observations we use are representative of high-latitude solar minimum conditions. We examine magnetic field power spectra characteristics of interplanetary turbulence at high…
Unambiguous detection of mesospheric CO2 clouds on Mars using 2.7 µm absorption band from the ACS/TGO solar occultations
Grigoriev, A.; Montmessin, F.; Fedorova, A. +5 more
Mesospheric CO2 clouds are one of two types of carbon dioxide clouds known on Mars. We present observations of mesospheric CO2 clouds made by Atmospheric Chemistry Suite (ACS) onboard the ESA-Roscosmos ExoMars Trace Gas Orbiter (TGO). We analyzed 1663 solar occultation sessions of Thermal InfraRed (TIRVIM) and Middle InfraRed…
Multispacecraft Observations of Protons and Helium Nuclei in Some Solar Energetic Particle Events toward the Maximum of Cycle 25
Ubertini, P.; Battiston, R.; Burger, W. J. +41 more
The intricate behavior of particle acceleration and transport mechanisms complicates the overall efforts in formulating a comprehensive understanding of solar energetic particle (SEP) events; these efforts include observations of low-energy particles (from tens of keV to hundreds of MeV) by space-borne instruments and measurements by the ground-ba…
Structural properties of subgroups of stars associated with open clusters
Hetem, Annibal; Gregorio-Hetem, Jane
Recent studies have identified star clusters with multiple components based on accurate spatial distributions and/or proper motions from Gaia Data Release 3 (DR3), utilizing diverse diagnostics to gain an understanding of subgroup evolution. These findings motivated us to search for subgroups among the objects examined in our previous work, which …
The Value-added Catalog of OB Stars in LAMOST DR7
Shi, Jianrong; Liu, Zhicun; Cui, Wenyuan +4 more
In this work, we update the catalog of OB stars based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7 and modify the OB stars' selection criteria in spectral line indices' space. The new catalog includes 37,778 spectra of 27,643 OB stars, of which 3827 OB stars are newly identified. The spectral subclasses of 27,643…
Investigating and comparing the IRIS spectral lines Mg II, Si IV, and C II for flare precursor diagnostics
Kleint, Lucia; Panos, Brandon; Zbinden, Jonas
Context. Reliably predicting solar flares can mitigate the risks of technological damage and enhance scientific output by providing reliable pointings for observational campaigns. Flare precursors in the spectral line Mg II have been identified. Aims. We extend previous studies by examining the presence of flare precursors in additional spectral l…