Results 51 to 60 of about 335 (184)
Evolution of Terrestrial Planetary Bodies and Implications for Habitability
Reviews of Geophysics, Volume 63, Issue 4, December 2025.Abstract The terrestrial planetary bodies of our solar system—Mercury, Venus, Earth, and Mars—share a common origin through nebular accretion and early magma ocean differentiation, yet they diverged significantly in geological evolution, tectonic regimes, and habitability.
Peter A. Cawood +4 more
wiley +1 more source
Asymmetric Planetary Nebulae V. Conference proceedings
, 2011 The Asymmetric Planetary Nebulae V meeting was held in Bowness-on-Windermere, 20-25 June 2010. These are the full proceedings of this conference Contents Welcometo AsymmetricPlanetaryNebulae 5 ...................
Lykou, Foteini +3 more
core +1 more source
The Fate of Stellar Material: Radio Molecular Line Studies of Nearby Planetary Nebulae [PDF]
, 2020 Planetary nebulae constitute the near-end stages of low-to-intermediate-mass stars, when their ejected envelopes of gas and dust become ionized by their unveiled stellar cores.
Bublitz, Jesse
core
The Astronomical JournalIf a planetary nebula (PN) is shown to be a member of a star cluster, we obtain important new constraints on the mass and chemical composition of the PN’s progenitor star, which cannot be determined for PNe in the field.
Howard E. Bond +2 more
doaj +1 more source
KINEMATICAL PROPERTIES OF PLANETARY NEBULAE WITH WR-TYPE NUCLEI
Publications of The Korean Astronomical Society, 2015 We have carried out integral field unit (IFU) spectroscopy of H$α$, [N II] and [O III] emission lines for a sample of Galactic planetary nebulae (PNe) with Wolf-Rayet (WR) stars and weak emission-line stars (wels). Comparing their spatially-resolved kinematic observations with morpho-kinematic models allowed us to disentangle their three-dimensional ...
Parker, QA, Steffen, W, Danehkar, A
openaire +4 more sources
UBV Photometry of the Bright Nuclei of the Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1968 The data, which we have at present for the planetary nebulae central stars, are in general insufficient and uncertain. Even the photographic magnitudes of the brightest nuclei are usually given in the known catalogues with accuracies of 2m or 3m. Therefore, the determination of central stars' magnitudes by the photoelectric method seems to be of great ...
E. B. Kostjakova +3 more
openaire +1 more source
Löpönvaara: A new phosphorus‐rich iron meteorite from Finland
Meteoritics &Planetary Science, Volume 60, Issue 10, Page 2442-2457, October 2025.Abstract Löpönvaara is a rare new phosphorus‐rich iron meteorite find from Löpönvaara, Finland. The ~164 g meteorite was discovered in 2017 from the same area as the ungrouped Lieksa pallasite. Löpönvaara was classified as an ungrouped iron meteorite due to its unusually high concentration of P (>4 wt%), coupled with a moderate concentration of Ni (~11
Laura Kotomaa +5 more
wiley +1 more source
The Possibility of Beta decay in the Atmospheres of Nuclei of Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1968 At present there is some basis for questioning the usual presentation of the nuclei of planetary nebulae as being ordinary stars. If the quantity of mass released by a star during its formation or at some stage of its evolution serves as a criterion for its not being stationary, then the nuclei of planetary nebulae are hardly the most non-stationary ...
openaire +1 more source
Proton Acceleration with Relativistic Electromagnetic Shock
Advanced Science, Volume 12, Issue 30, August 14, 2025.New Ion Acceleration Mechanism! A novel cosmic‐ray proton acceleration mechanism is proposed, where relativistic electromagnetic shocks accelerate protons transversely. Hamiltonian analysis yields a scaling law linking the proton energy to the minimum longitudinal thickness of the shock.
Ting Xiao +5 more
wiley +1 more source
The Astronomical JournalWe report our discovery of a faint nebula surrounding a previously little-studied 15th mag variable star, ASASSN-19ds, in the Southern Hemisphere constellation Antlia. Spectra verify that the star is a cataclysmic variable (CV).
Howard E. Bond +4 more
doaj +1 more source