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Disentangling the two sub-populations of early Herbig Be stars using VLT/X-shooter spectra
Arun, R.; Manoj, P.; Maheswar, G. +5 more
Context. Early Herbig Be (HBe) stars are massive, young stars accreting through the boundary layer mechanism. However, given the rapid (<2 Myr) evolution of early Herbig stars to the main-sequence phase, studying the evolution of the circumstellar medium around these stars can be a cumbersome exercise.
Aims: In this work, we study the samp…
Is the M81 Fast Radio Burst Host Globular Cluster Special?
Vesperini, Enrico; Kundu, Arunav; Strader, Jay +5 more
We use multiband archival Hubble Space Telescope (HST) observations to measure the photometric and structural parameters of the M81 globular cluster (GC) that hosts the fast radio burst FRB 20200120E. Our best-fitting King model has an effective radius r h = 3.06 pc with a moderate King model concentration of c = 53, and an inferred c…
Solar wind H+ fluxes at 1 AU for solar cycles 23 and 24
Sznajder, Maciej
The solar wind consists of electrons and ion species having kinetic energy ≲ 10 keVs. Ion stream is mainly composed of protons. Their flux magnitude is especially important for radiation hardness assurance scientists who qualify materials for future space missions. Materials irreversibly degrade as soon as are exposed to solar radiation. Hence, pr…
Parámetros estructurales de cúmulos abiertos y su comportamiento en presencia de compañeros cercanos
Baume, G.; Rodríguez, M. J.; Feinstein, C. +3 more
The study of a relevant and homogeneous sample of open clusters is presented with the aim of analysing the internal structure in clusters that are part of binary or multiple systems. In the applied procedure we used the astrometric and photomeric data provided by the Gaia survey (DR2) and the membership probabilities of its members obtained from c…
Application of the binary spectral model to high-resolution spectra. First estimation of the fundamental parameters for HD 20784
Kovalev, Mikhail; Straumit, Ilya
In this paper, we applied previously developed method of binary spectral model fitting to the high-resolution spectra of HD 20784. Simultaneously analysing all three available epochs, we found spectroscopic parameters for both components of the system. These parameters are consistent with stellar evolution model's predictions and analysis of the p…
The Wagging Plasma Tail of Comet C/2020 S3 (Erasmus)
Jewitt, David; Li, Jing; Kim, Yoonyoung
Long-period comet C/2020 S3 (Erasmus) reached perihelion at 0.398 au on UT 2020 December 12.67, making it a bright, near-Sun object. Images taken between 2020 mid-November and December using the HI-1 camera and COR2 coronagraph on board STEREO-A, as well as the LASCO/C3 coronagraph on board SoHO, show significant variations in the plasma tail posi…
First investigations of 14 neglected, late-type contact binaries
M, Raghu Prasad; Jagirdar, Rukmini; Devarapalli, Shanti Priya
In the current work we present the first investigations of 14 neglected, late-type, short period contact binaries using period variation, photometric and spectroscopic analysis performed on long term space and ground based observations. The binaries in study belong to spectral classes F to K. In this study the two contact binaries TIC 242100930 an…
Preparing for Gaia searches for optical counterparts of gravitational wave events during O4
Jonker, Peter G.; van Leeuwen, M.; Hodgkin, Simon +9 more
The discovery of gravitational wave (GW) events and the detection of electromagnetic counterparts from GW170817 has started the era of multimessenger GW astronomy. The field has been developing rapidly, and in this paper, we discuss the preparation for detecting these events with ESA's Gaia satellite, during the 4th observing run of the LIGO-Virgo…
The road to on-board crew autonomy: Using ISS' Columbus module as the basis for ground procedure automation
Hartmann, Carsten; Speth, Franca; Sabath, Dieter +1 more
Future human exploration missions require new concepts of operations since the international roadmap foresees stations with uncrewed periods (e.g. Lunar Gateway) and deep space missions with communication delays making real-time monitoring and control impossible (e.g. any vehicle on its way to or in orbit of Mars). As part of the commitment to ach…
Magnetic connectivity and solar energetic proton event intensity profiles at deka-MeV energy
Paassilta, Miikka; Raukunen, Osku; Vainio, Rami +3 more
We present an analysis of the time-intensity profiles of 25 solar energetic proton events at 18.2 MeV, modelled by fitting an analytical function form (a modified Weibull function) to the observed intensities. Additionally relying on previous work that characterized the magnetic connectivity between the event-related solar flare and the observer i…