Search Publications
Search and study of young infrared stellar clusters
Azatyan, Naira
The main aim of this paper is to study both the Interstellar Medium (ISM) and the young stellar population in the three star-forming regions, namely IRAS 05137+3919, 05168+3634, and 19110+1045. The study of the ISM includes determination of the hydrogen column density (N(H2)) and dust temperature (Td) in the regions using mod…
Investigative study of five low mass ratio semi-detached binaries
Stassun, Keivan G.; Parthasarathy, Mudumba; Jagirdar, Rukmini +2 more
We present the first pulsation analysis of four totally eclipsing Algol systems S Cnc, SS Cet, TW And, and VW Cyg using the latest data available from Kepler (K2), and TESS databases. Based on the characteristics observed they are classified to be oscillating eclipsing Algol binaries with primary components having
Deep learning-based prediction of CME-driven shock standoff distances in metric type II radio emissions
Elsaid, Ahmed; Mahrous, Ayman; Hamada, Amr +1 more
Type II radio emissions are events mostly found to be associated with coronal mass ejections (CMEs) and accelerated by the CME-driven shock in the heliosphere. This study reports on the estimation of the CME-shock standoff distance at the commencement of metric type II radio emissions by combining the CME-deprojected speed and spectral features of…
Tracing shock waves: type II radio emission on 27th of September 2001
Al-Hamadani, Firas; Al-Sawad, Amjad
This study focus on atypical Type II radio bursts observed in conjunction with three simultaneous coronal mass ejections (CMEs) on September 27, 2001. These CMEs originated from a single active region (AR) and were linked to relatively weak solar flares. Analysis of the CME sequences revealed distinct periods of interplanetary (IP) Type II radio e…
Radio continuum emission from planetary nebulae in the Small Magellanic Cloud
Filipović, M. D.; Crawford, E. J.; Bojičić, I. +3 more
We report 11 new radio continuum measurements of established planetary nebulae (PNe) in the Small Magellanic Cloud (SMC) that we observed at 5.5 and 9 GHz with the Australia Telescope Compact Array (ATCA). These new radio detections are PNe with catalogued names: SMP SMC 2, SMP SMC 3, SMP SMC 5, SMP SMC 8, SMP SMC 13, SMP SMC 14, SMP SMC 19, MGPN …
Centering algorithm of an unresolved primary and satellite system
Peng, Q. Y.; Guo, B. F.; Hao, J. N.
Affected by the Earth's atmosphere, the image of a primary and satellite system may appear unresolved, such as the dwarf planet Haumea system. It is found by experiments that neither the two-dimensional Gaussian nor modified moment centering algorithms can accurately measure the photocenter of an image of unresolved primary and satellite system ob…
Perturbation effect of solar radiation pressure on the Sun-Earth co-orbital motion
Zhao, Mingxu; Qi, Yi; Qiao, Dong
Sun-Earth co-orbital motions have an important value in deep space explorations due to their unique orbital characteristics and spatial configurations. In this paper, we investigate the influence of the solar radiation pressure (SRP) on the Sun-Earth co-orbital motion. Firstly, we derive several analytical formulas of the effect of the SRP on orbi…
Investigations on halo coronal mass ejections, sunspots and their geoeffectiveness in the rising phase of the solar cycle 25
Mujiber Rahman, A.; Kubera Raja, A.
In this research paper we investigated the halo coronal mass ejections and sunspot number during the period December 2019 to December 2023 for the rising phase of solar cycle 25. The SOHO/LASCO instrument observed 145 HCMEs during this period. We selected 145 halo CMEs and the associated flares, SSN and Dst. The HCME is found to be significantly f…
The origin of free-floating planets
Miret-Roig, Núria
Free-floating planets (FFPs) are the lightest products of star formation and they carry important information on the initial conditions of the environment in which they were formed. They were first discovered in the 2000 s but still few of them have been identified and confirmed due to observational challenges. This is a review of the last advance…
The Positron Puzzle
Siegert, Thomas
The Positron Puzzle is a half-century old conundrum about the origin of the Galactic