Search Publications
Spottedness Activity of the Young Star HIP 94235 from the Moving Group AB Doradus
Savanov, I. S.
Based on high-precision data from the archive of the TESS space mission, a study is made of the photometric variability of the brightness of HIP 94235, a bright star belonging to the 120 million years old moving group AB Doradus. We obtained an estimate for the rotation period of the star and the amplitude of the brightness variability, as well as…
Excitation and Excavation of the Claws of the Southern Crab
Frank, Adam; Balick, Bruce; Swegel, Ashley
We show that the Southern Crab (aka Hen2-104) presents an auspicious opportunity to study the form and speed of the invisible winds that excavate and shock the lobes of various types of bipolar nebulae associated with close and highly evolved binary stars. A deep three-color image overlay of Hen2-104 reveals that the ionization state of its lobe e…
First photometric study of two eclipsing binary star systems: V523 And and V543 And
Erdem, Ahmet; Öztürk, Oğuz
Detailed photometric analysis of V523 And and V543 And from the Wide Angle Search for Planets survey is presented for the first time. It was found that while V523 And is a detached binary, V543 And is a semi-detached binary star system. The adopted masses and radii for the primary and secondary components are M1 = 0 . 77 ± 0 . 08 M⊙, R<…
New approaches for faint source detection in hard X-ray surveys
Bird, A. J.; Lepingwell, V. A.; Gunn, S. R.
We demonstrate two new approaches that have been developed to aid the production of future hard X-ray catalogues, and specifically to reduce the reliance on human intervention during the detection of faint excesses in maps that also contain systematic noise. A convolutional neural network has been trained on data from the INTEGRAL/ISGRI telescope …
Application of the dynamic programming method to ensure of dual-channel attitude control of an asymmetric spacecraft in a rarefied atmosphere of Mars
Bakry, Ibrahim; Lyubimov, Vladislav Vasilyevich
We consider a linearized dynamic system, which determines the motion of the spacecraft relative to the center of mass in a rarefied atmosphere of Mars in the non-resonant case. This dynamic system takes into account the influence of disturbances from small aerodynamic and inertial asymmetry. The aim of this paper is to synthesis approximate optimi…
Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis
Chaplin, William J.; Stassun, Keivan G.; Basu, Sarbani +14 more
Binary stars in which oscillations can be studied in either or both components can provide powerful constraints on our understanding of stellar physics. The bright binary 12 Boötis (12 Boo) is a particularly promising system because the primary is roughly 60 per cent brighter than the secondary despite being only a few per cent more massive. Both …
Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in situ measurements with a numerical MHD reconstruction of the Parker spiral
Telloni, Daniele; Susino, Roberto; Antonucci, Ester +21 more
As a key feature, NASA's Parker Solar Probe (PSP) and ESA-NASA's Solar Orbiter (SO) missions cooperate to trace solar wind and transients from their sources on the Sun to the inner interplanetary space. The goal of this work is to accurately reconstruct the interplanetary Parker spiral and the connection between coronal features observed remotely …
Hyades kinematics and the relationship between galactic coordinates and its angular distance from the apex with GAIA EDR3
Elsanhoury, W. H.; Al-Johani, A. S.; Al-Juhani, A. +6 more
In this paper, we have improved the Hyades members with aid of the Gaia EDR3 source. We have studied their kinematics, including computations of the convergent point with AD-diagram method such as (A0, D0) = (79.48 ± 0.11°, 6.85 ± 0.38°), their spatial velocities U, V, W (km/s), their morphology with 3D. A relation was established for Hyades stars…
Companions to Kepler giant stars: A long-period eccentric sub-stellar companion to KIC 3526061 and a stellar companion to HD 187878
Cochran, William D.; Vítková, Michaela; Kabáth, Petr +12 more
Context. Our knowledge of populations and the occurrence of planets orbiting evolved intermediate-mass stars is still incomplete. In 2010 we started a planet search programme among 95 giant stars observed by the Kepler mission to increase the sample of giant stars with planets and with reliable estimates of stellar masses and radii.
Aims: We …
Rise and fall of silicate dust in RS Ophiuchi following the 2006 eruption
Gehrz, R. D.; Eyres, S. P. S.; Evans, A. +4 more
We present an analysis of archival Spitzer InfraRed Spectrograph (IRS) observations of the recurrent nova RS Ophiuchi obtained on several occasions, beginning about 7 months after the outburst in 2006. These data show atomic emission lines, absorption bands due to photospheric SiO, and the well-known silicate dust features at 9.7 and $18\, \mu$m. …