Results 11 to 20 of about 16,066,439 (292)

The AT20G high-angular-resolution catalogue [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
We present the high angular resolution catalogue for the Australia Telescope 20 GHz (AT20G) survey, using the high angular resolution 6-km antenna data at the baselines of ~ 4500 m of the Australia Telescope Compact Array (ATCA). We have used the data to produce the visibility catalogue that separates the compact Active Galactic Nuclei (AGNs) from the ...
Chhetri, R., Ekers, Ronald, Jones, P., Ricci, R.   +3 more
core   +5 more sources

The Orbital and Physical Properties of Five Southern Be+sdO Binary Systems

The Astronomical Journal, 2023
Close binary interactions may play a critical role in the formation of the rapidly rotating Be stars. Mass transfer can result in a mass gainer star spun up by the accretion of mass and angular momentum, while the mass donor is stripped of its envelope ...
Luqian Wang, Douglas R. Gies, Geraldine J. Peters, Zhanwen Han   +3 more
doaj   +1 more source

High-angular resolution observations of the Pistol star [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractFirst results of near-IR adaptive optics (AO)-assisted imaging, interferometry, and spectroscopy of this Luminous Blue Variable (LBV) are presented. They suggest that the Pistol Star is at least double. If the association is physical, it would reinforce questions concerning the importance of multiplicity for the formation and evolution of ...
Martayan, C., Blomme, R., Bouquin, J.-B., Merand, A., Montagnier, G., Selman, F., Girard, J., Fox, A., Baade, D., Frémat, Y., Lobel, A., Martins, F., Patru, F., Rivinius, T., Sana, H.A.A., Stefl, S., Zorec, J., Semaan, T.   +17 more
openaire   +4 more sources

The Great Dimming of the Hypergiant Star RW Cephei: CHARA Array Images and Spectral Analysis

The Astronomical Journal, 2023
The cool hypergiant star RW Cephei is currently in a deep photometric minimum that began several years ago. This event bears a strong similarity to the Great Dimming of the red supergiant Betelgeuse that occurred in 2019–2020.
Narsireddy Anugu, Fabien Baron, Douglas R. Gies, Cyprien Lanthermann, Gail H. Schaefer, Katherine A. Shepard, Theo ten Brummelaar, John D. Monnier, Stefan Kraus, Jean-Baptiste Le Bouquin, Claire L. Davies, Jacob Ennis, Tyler Gardner, Aaron Labdon, Rachael M. Roettenbacher, Benjamin R. Setterholm, Wolfgang Vollmann, Costantino Sigismondi   +17 more
doaj   +1 more source

Prototype High Angular Resolution LEKIDs for NIKA2 [PDF]

Journal of Low Temperature Physics, 2018
The current resolution of the NIKA2 260 GHz arrays is limited by the $1.6\times 1.5 mm^2$ inductor size on the individual pixels. In view of future updates of the instrument, we have developed a prototype array with smaller pixels that is experimentally compared to the current pixel design.
S. Shu, M. Calvo, S. Leclercq, J. Goupy, A. Monfardini, E. F. C. Driessen   +5 more
openaire   +3 more sources

gyre_tides: Modeling Binary Tides within the GYRE Stellar Oscillation Code

The Astrophysical Journal, 2023
We describe new functionality in the GYRE stellar oscillation code for modeling tides in binary systems. Using a multipolar expansion in space and a Fourier-series expansion in time, we decompose the tidal potential into a superposition of partial tidal ...
Meng Sun, R. H. D. Townsend, Zhao Guo
doaj   +1 more source

Improving the spatial, angular, and temporal resolution in light field imaging

, 2022
Yu, JingyiA light field captures a dense set of rays as scene descriptions in place of geometry. Recent advances on computational imaging have enabled novel and efficient light field acquisition devices. For example, the new Lytro and Raytrix cameras are
Yu, Zhan
core   +1 more source

Star formation at high angular resolution [PDF]

New Astronomy Reviews, 2004
The role of the SKA in high resolution observations of the formation of low and high mass stars in the Galaxy is examined. The large collecting area will have a large impact on dynamical studies at high resolution using spectral lines. The SKA will allow dramatic progress in the investigation of the ionised, atomic and molecular phases over a range of ...
openaire   +2 more sources

THE HIGH ANGULAR RESOLUTION MULTIPLICITY OF MASSIVE STARS [PDF]

The Astronomical Journal, 2009
We present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago. The speckle observations were made with the KPNO and CTIO 4 m telescopes and USNO speckle camera, and they are sensitive to the detection of binaries in the angular separation regime between 0 ...
Mason, Brian D., Hartkopf, William I., Gies, Douglas R., Henry, Todd J., Helsel, John W.   +4 more
openaire   +2 more sources

Finsler geometry on higher order tensor fields and applications to high angular resolution diffusion imaging. [PDF]

, 2009
We study 3D-multidirectional images, using Finsler geometry. The application considered here is in medical image analysis, specifically in High Angular Resolution Diffusion Imaging (HARDI) (Tuch et al. in Magn. Reson. Med.
Florack, L.M.J., Luc Florack, Florack, Luc, Florack, LMJ Luc, Astola, Laura, Florack, L., Astola, LJ Laura, Laura Astola, Astola, L.J., Astola, L.   +9 more
core   +2 more sources