Results 31 to 40 of about 25,497 (219)

Clusters and Nebulae [PDF]

open access: yesScientific American, 1921
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openaire   +2 more sources

The Nebulae

open access: yesPublications of the Astronomical Society of the Pacific, 1917
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openaire   +3 more sources

ABOUT TEMPERATURE FIELDS AND CONDITIONS OF GASEOUS CONDENSATION OF NEBULAES IN THE PLANETARY VORTEX

open access: yesVìsnik Dnìpropetrovsʹkogo Unìversitetu: Serìâ Modelûvannâ, 2014
New exact solution of the spherically-axissymmetric Eiler's equations, called as plan­etary vortex, is applied to the problem of formation in planetary nebula germs of planets due to the condensation of gases in the areas of vortex instability which ...
L. V. Klyuchinskaya, V. I. Perechrect
doaj   +1 more source

Planetary Nebulae Populations in External Galaxies [PDF]

open access: yes, 2011
This review highlights the properties of the planetary nebulae in external galaxies as tracers of light, of the stellar population properties, and of the distances and kinematics of the parent galaxies. Recent results on the kinematics of the outer regions in giant elliptical galaxies and on the luminosity specific PN numbers (the \alpha\ parameter) in
arxiv   +1 more source

Observations of the Crab Nebula and Pulsar with the Large-sized Telescope Prototype of the Cherenkov Telescope Array

open access: yesThe Astrophysical Journal, 2023
The Cherenkov Telescope Array (CTA) is a next-generation ground-based observatory for gamma-ray astronomy at very high energies. The Large-Sized Telescope prototype (LST-1) is located at the CTA-North site, on the Canary Island of La Palma.
H. Abe   +289 more
doaj   +1 more source

A PeVatron Candidate: Modeling the Boomerang Nebula in X-ray Band

open access: yesUniverse, 2022
Pulsar wind nebula (PWN) Boomerang and the associated supernova remnant (SNR) G106.3+2.7 are among candidates for the ultra-high-energy (UHE) gamma-ray counterparts published by LHAASO.
Xuan-Han Liang   +4 more
doaj   +1 more source

Nebulae in the Pleiades [PDF]

open access: yesAstronomische Nachrichten, 1886
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openaire   +2 more sources

The Ever Changing Circumstellar Nebula Around UW Centauri [PDF]

open access: yes, 1999
We present new images of the reflection nebula surrounding the R Coronae Borealis Star, UW Cen. This nebula, first detected in 1990, has changed its appearance significantly. At the estimated distance of UW Cen, this nebula is approximately 0.6 ly in radius so the nebula cannot have physically altered in only 8 years.
arxiv   +1 more source

Magnetic Fields in the Horsehead Nebula

open access: yesThe Astronomical Journal, 2023
We present the first polarized dust emission measurements of the Horsehead Nebula, obtained using the POL-2 polarimeter on the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera on the James Clerk Maxwell Telescope.
Jihye Hwang   +4 more
doaj   +1 more source

Visual Wide Binaries and the Structure of Planetary Nebulae [PDF]

open access: yes, 1999
In a recent work Ciardullo et al. (1999) list 19 planetary nebulae surveyed by the Hubble Space Telescope for the presence of resolved visual binary companions of their central stars. For ten planetary nebulae they argue for probable physical association of the resolved stars with the central stars, while for nine the association is less likely.
arxiv   +1 more source

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