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HP Cet and Swift J0820.6-2805: two candidate intermediate polars observed by XMM-Newton
Nucita, A. A.; De Paolis, F.; Strafella, F. +1 more
We report on the XMM-Newton observation of HP Cet and Swift J0820.6-2805, two X-ray photon sources that are candidates to be members of the intermediate polar class of cataclysmic variables. If the historical optical light curve of HP Cet shows a periodic feature at ≃96 min, a clear identification of such a signature in the high energy band (apart…
Domain of Influence analysis: implications for Data Assimilation in space weather forecasting
Poedts, Stefaan; Lapenta, Giovanni; Innocenti, Maria Elena +3 more
Solar activity, ranging from the background solar wind to energetic coronal mass ejections (CMEs), is the main driver of the conditions in the interplanetary space and in the terrestrial space environment, known as space weather. A better understanding of the Sun-Earth connection carries enormous potential to mitigate negative space weather effect…
BD+14°3061: A Luminous Yellow Post-AGB Star in the Galactic Halo
Bond, Howard E.
I report the discovery that the ninth-mag Galactic-halo star BD+14°3061 is a member of the rare class of luminous metal-poor "yellow post-AGB" stars. Its Gaia DR2 parallax implies an absolute magnitude of MV = -3.44 ± 0.27, and it is a very high-velocity star moving in a retrograde Galactic orbit. BD+14°3061 is a field analog of the hal…
Photometric study and kinematics of the EL CVn type eclipsing binary: WASP 1628+10
Luo, Yangping
1SWASP J162842.31+101416.7 (WASP 1628+10) is an EL CVn-type eclipsing binary system that is composed of a very low mass helium white dwarf precursor (WSAP 1628+10B) and an A-type dwarf star (WASP 1628+10A). We presented time-series BV photometric observations of WASP 1628+10. Six times of light minima were observed. The physical parameters of the …
Search for Evolutionary Changes in the Period the Cepheid ET Vul
Berdnikov, L. N.; Pastukhova, E. N.
The reduction of all the available photometry for the Cepheid ET Vul has allowed its $O-C$ diagram spanning a time interval of 130 years to be constructed. This has made it possible to calculate for the first time the rate of evolutionary decrease in the period, $dP/dt=-426.5(±{29.7})$ s yr${}^{-1}$, in agreement with the results of model calculat…
Plasma Turbulence at Comet 67P/Churyumov-Gerasimenko: Rosetta Observations
Halekas, J. S.; Howes, G. G.; Ruhunusiri, S.
We perform a power spectral analysis of magnetic field fluctuations measured by the Rosetta spacecraft's magnetometer at comet 67P/Churyumov-Gerasimenko. We interpret the power spectral signatures in terms of plasma turbulent processes and discover that different turbulent processes are prominent during different active phases of the comet. During…
Multistage ice-damming of volcanic flows and fluvial systems in Northeast Syrtis Major
Mustard, J. F.; Skok, J. R.; Matherne, Connor +2 more
The northeast edge of the Syrtis Major volcanic complex records a diverse history of volcanism and climate of early Mars which has long been argued to be dominated by icy or wet conditions. This region contains a stratigraphic record that spans the period of phyllosilicate secondary mineralogy from moderate pH alteration of the Early Noachian crus…
Using Stereoscopic Observations of Cometary Plasma Tails to Infer Solar Wind Speed
Wang, Yuming; Liu, Rui; Li, Xiaolei +2 more
Detection of the solar wind speed near the Sun is significant in understanding the heating and acceleration of the solar wind. Cometary plasma tails have long been used as natural probes for solar wind speed; previous solar wind speed estimates via plasma tails, however, were based on comet images from a single viewpoint, and the projection effect…
Estimation of distortion on NEEMO system of telescopes
Birlan, M.; Nedelcu, D. A.; Trelia, M. +1 more
The article treats on astrometric measurements obtained using NEEMO system of telescopes and the improvement by applying a distortion model. Astrometric measurements for T05 show a stable value of residuals, independent of distortion model, while the measurements for T03 are improved by a factor three when use a quartic distortion model.
Distribution of Eruptive Centers on Top of Large Shield Volcanoes in the Inner Solar System: General Classification and Glimpses of Their Subvolcanic Structure
Jacobo-Bojórquez, Rocío.; Cañón-Tapia, Edgardo
Processes that occur beneath a planetary surface control the spatial distribution of volcanic features in a volcanic zone. Volcanic vents frequently form clusters and alignments controlled by the lithospheric structure and the stress field. Previous works have determined the influence of stress at different scales in a volcanic area. In this work,…