Results 21 to 30 of about 5,336,206 (299)
Detecting primordial stars [PDF]
New Astronomy Reviews, 2006 We study the detectability of primordial metal-free stars. Cosmological enrichment is a local process that takes place over an extended redshift range. While the duration of this transition depends on several unknown factors, in all cases late-forming metal-free stars are found in ~ 10^8 solar mass objects, which are just large enough to cool, but ...
Scannapieco, Evan +5 more
openaire +2 more sources
Detectability of Bulge stars [PDF]
Symposium - International Astronomical Union, 1993 Classification algorithms based on neural network techniques are applied to study if the bulge stars can be differentiated from other stars belonging to other Galactic components. A synthetic sample is build as a mixture of four components, thin disk, thick disk, halo and bulge, according to some stellar system models and considering observational ...
M. Hernandez-Pajares +3 more
openaire +1 more source
On the Detection of Supermassive Primordial Stars [PDF]
The Astrophysical Journal Letters, 2018 Abstract The collapse of supermassive primordial stars in hot, atomically cooled halos may have given birth to the first quasars at z ∼ 15–20. Recent numerical simulations of these rapidly accreting stars reveal that they are cool, red hypergiants shrouded by dense envelopes of pristine atomically cooled gas at 6000–8000 K, with ...
Marco Surace +8 more
openaire +3 more sources
Research on the Detection Method of Projection Stellar Target Simulator
Photonics, 2023 The projection stellar target simulator is a stellar target simulator in which star points are projected to be imaged on a fixed plane at a fixed distance.
Jianan Kang +4 more
doaj +1 more source
Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole [PDF]
Astronomy & Astrophysics, 2020 The star S2 orbiting the compact radio source Sgr A* is a precision probe of the gravitational field around the closest massive black hole (candidate). Over the last 2.7 decades we have monitored the star’s radial velocity and motion on the sky, mainly ...
R. Abuter +54 more
semanticscholar +1 more source
ON THE DETECTABILITY OF STAR-PLANET INTERACTION [PDF]
The Astrophysical Journal, 2012 Magnetic (or tidal) interactions between "hot Jupiters" and their host stars can potentially enhance chromospheric and coronal activity. An ideal testbed for investigating this effect is provided by the extreme WASP-18 system, which features a massive (~10 times Jupiter) close-in (~1 day period) transiting planet orbiting a young F6 star. Optical and X-
Miller, Brendan P. +3 more
openaire +3 more sources
Detecting double neutron stars with LISA [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We estimate the properties of the double neutron star (DNS) population that will be observable by the planned space-based interferometer Laser Interferometer Space Antenna (LISA). By following the gravitational radiation-driven evolution of DNSs generated from rapid population synthesis of massive binary stars, we estimate that ...
Lau M. Y. M. +5 more
openaire +4 more sources
Design and Simulation of a High-Speed Star Tracker for Direct Optical Feedback Control in ADCS
Sensors, 2020 Star Trackers are often the most accurate instrument in an Attitude Determination and Control Systems, but often present a slow update rate, requiring additional sensor and sensor fusion algorithms to provide a smoother and faster output.
Mikaël Marin, Hyochoong Bang
doaj +1 more source
Rotational Shearing Interferometer in Detection of the Super-Earth Exoplanets
Applied Sciences, 2022 The astronomers and the general population are fascinated with the problem of exoplanet detection. By far the largest number of detected planets are the so-called Super Earths, relatively cold planets orbiting a large, red giant star, with diameters up ...
Marija Strojnik
doaj +1 more source
Star-convex Polyhedra for 3D Object Detection and Segmentation in Microscopy [PDF]
IEEE Workshop/Winter Conference on Applications of Computer Vision, 2019 Accurate detection and segmentation of cell nuclei in volumetric (3D) fluorescence microscopy datasets is an important step in many biomedical research projects.
Martin Weigert +4 more
semanticscholar +1 more source