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Havlen-Moffat #1, el cúmulo menos pensado
Morrell, N. I.; Gamen, R. C.; Giorgi, E. E. +1 more
The cluster Havlen-Moffat # 1 (HM1), in the constellation of Scorpius, owes its name to those who discovered it in 1977. They identified, spectroscopically, two Wolf-Rayet and two Of-type stars. HM1 is located in the fourth quadrant of the Milky Way where the absorption of the interstellar medium is significant. This work presents an analysis of t…
Detection of Periodicity in SiO Maser Intensity and Velocity Shift of the Symbiotic Star CH Cyg
Kim, Dong-Jin; Kim, Jaeheon; Cho, Se-Hyung +3 more
We performed simultaneous monitoring observations of H2O 616-523 and SiO V = 1, 2, $J=1\to $ 0, SiO V = 1, $J=2\to $ 1, $3\to 2$ maser lines toward the symbiotic star CH Cyg from 2012 December to 2019 November using the Korean very long baseline interferometry Network single-dish telescope. SiO V = 1, 2, $J=1\to 0$…
The kinematics of OB-stars and Cepheids based on Gaia DR2 catalogue
Pakhomova, P. V.
The purpose of the work was to study the kinematics and refine the distance scale of young objects of the galactic disk: OB stars and high-luminosity stars of late spectral classes, as well as Cepheids. We used the observational data obtained during the Gaia mission and published in the Gaia DR2 catalog. The statistical parallax method was used to…
STARHORSE photo-astrometricdistances, extinctions, and astrophysical parameters for Gaia DR2 stars
Anders, F.; Chiappini, C.; Santiago, B. X. +2 more
By combining the precise data delivered by Gaia DR2 with the photometric catalogues of PanSTARRS-1, 2MASS, and AllWISE, we recently derived Bayesian stellar parameters, distances, and extinctions for 265 million stars. The results are available to the community through the Gaia mirror at gaia.aip.de. We remind the community to pay attention to the…
Quasiperiodic Velocity Fluctuations in Eruptive Prominences Observed by AIA/SDO
Tsvetkov, Tsvetan; Petrov, Nikola
The current study presents an investigation of the behavior of prominences during eruptions. Variations in the distribution of their velocities are detected at altitudes <0.6 R⊙. Detailed analyses are carried out for 304 Å Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations. To track the behavior of promine…
Features of Slow Sunspot Dissipation
Solov'ev, A. A.; Zhivanovich, I.
According to a model of sunspot dissipation through a thin boundary layer between the sunspot magnetic flux tube and the surrounding medium, the rate of decrease in the sunspot area must slow as the spot size decreases until it reaches a critical threshold at which the linear law of sunspot dissipation gives way to a nonlinear one. This theoretica…
Agile Development of Science Operations: The Solar Orbiter Experience
García-Reinaldos, María; Marcos, José; Sánchez, Luis
Cost and schedule are very rigid external constraints for the development of a Science Operations Centre (SOC), as typically the SOC is not considered a critical item for launch and cost and schedule depend on the overall project. Therefore, the greatest degree of flexibility in SOC development is the scope: while we aim to satisfy all the high le…
On the unexpected geomagnetic storm on june 8, 2019, and the heliospheric current sheet effect
Augusto, C. R. A.; Navia, C. E.; de Oliveira, M. N. +1 more
A period of minimum magnetic solar activity (such as June 2019) favors the observation of rare solar transient events, which would otherwise be lost in the magnetic vortex during a period of maximum solar activity. In this paper, we show that the most plausible explanation for the origin of an unexpected geomagnetic storm on June 8, 2019, is a sma…
Numerical simulation of ion reflection by lunar crustal magnetic fields
Divin, Andrey; Deca, Jan; Lue, Charles +1 more
We investigate the dynamics of solar wind - Moon interaction by means of large-scale Particle-in-Cell (PIC) simulations in this study. Implicit moment PIC method and open boundaries are implemented in the code (iPIC3D) allowing to use large-scale domains in three dimensions. Even though the Moon has no global dipolar magnetic field, satellite magn…
Steerable High-Gain Dual-Reflector Antenna at X-Band for Solar Orbiter
Martinez, Victor Sanchez; Jimenez, Fernando Martin; Baladron, Inaki Pinto +7 more