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Berkeley 68 ve Stock 20 Açık Kümelerinin Yer ve Uzay Tabanlı Teleskop Verileriyle İncelenmesi
Yontan, Talar
Bu çalışmada Berkeley 68 (Be 68) ve Stock 20 açık kümelerinin ayrıntılı fotometrik ve astrometrik çalışması yapılmıştır. İki kümenin analizlerinde, CCD UBV fotometrik ile Gaia'nın üçüncü veri sürümünde (Gaia DR3) yayımladığı astrometrik ve fotometrik verileri birlikte kullanılmıştır. Yıldızların kümeye üyelik hesaplamaları sonucunda olasılık değer…
Phase spirals in cosmological simulations of Milky Way sized galaxies
Antoja, T.; Ramos, P.; García-Conde, B. +1 more
The Gaia DR2 revealed the phase spirals in the Z - Vz plane, whose origin is still under study, but linked to the Sagittarius dwarf galaxy tidal interaction. In our work, we detect phase spirals in the vertical projection Z - Vz of the disc's stellar particles for the first time in the zoom-in cosmological simulation GARROTXA which includes hydrod…
The True Nature of the Brightest Local Triple Stellar Candidates within 100 pc in the Galaxy
Al-Wardat, Mashhoor A.; Annuar, A.; Yousef, Z. T. +1 more
We present a study of a sample of bright (V ≤ 10 mag) and close (d ≤ 100 pc) triple-stellar system candidates in the galaxy, consisting of eight systems in total. Our aim is to determine their actual multiplicity and the physical properties of each stellar component in the systems. The sample was analyzed using a complex spectrophotometric techniq…
Search and identification of high-velocity stars by dynamical ejection and supernovae from multiple stars
Hambaryan, V.; Neuhaeuser, R.
The project, funded by Science Committee of RA (ARPI program), intended to search, detection, kinematic study and identification of the birth places of the high-velocity and isolated neutron stars that encountered in the past with a stellar groups (multiple stars, stellar clusters, associations, etc.) closer than 10 pc, i.e. to test the concept: a…
The Link Between Individual Velocities in the Incident Plasma Flow and Ion Populations Upstream of Collisionless Shocks
Wilkinson, W. P.; Humphreys, M.; Kilgallon, S.
The interaction of the solar wind with Earth's bow shock gives rise to several distinct ion populations upstream and downstream of the shock. Using numerical computation of trajectories in the de Hoffmann-Teller frame of reference and previous analytical results, we investigate whether membership of these populations is determined by a particle's …
Magnetopause Dynamics at Saturn as Observed by Cassini
Allen, Robert C.; Mo, Wenli; Paranicas, Chris +2 more
The occurrence and impacts of magnetopause processes at outer planets, particularly magnetic reconnection and the Kelvin-Helmholtz instability (KHI), remains unresolved. From a list of 2,114 magnetopause crossings at Saturn spanning the full duration of the Cassini mission, magnetic field and low-energy plasma properties are analyzed for each cros…
A photoelectric study of the eclipsing binary EG Serpentis
Thurman, Glenn M.
A ubvy photoelectric study of the early A-type, detached eclipsing binary EG Serpentis (EG Ser) has been undertaken at Mount Laguna Observatory. Simultaneous observation on two telescopes has been employed for the first time at the observatory. Approximately 2000 standardized differential magnitudes are presented along with standardized colours an…
On Tidal Distances between Components of Wide Binary Stars in the Pleiades
Danilov, V. M.
The paper estimates the tidal distances
The odd bunch: chrono-chemo-dynamics of sixteen unusual stars from Kepler
Monty, Stephanie; Stello, Dennis; Casagrande, Luca +4 more
In this study we combine asteroseismic, spectroscopic, and kinematic information to perform a detailed analysis of a sample of 16 stars from the Kepler field. Our selection focuses on stars that appear to contradict Galactic chemical evolution models: young and α-rich, old and metal-rich, as well as other targets with unclear classification in pas…
Data stream mining for predicting the thermal power consumption of the Mars Express spacecraft
Džeroski, Sašo; Kocev, Dragi; Stevanoski, Bozhidar +2 more
The Mars Express (MEX) spacecraft, operated by the European Space Agency (ESA), has been orbiting Mars for the past 18 years. During this period, it has provided unprecedented scientific data about the red planet, but it has also aged, and its batteries have degraded. Thus, MEX needs careful and accurate power modeling to continue its significant …