Results 111 to 120 of about 205,774 (262)

He II Raman Scattered Line by Neutral Hydrogen in the Bipolar Platenary Nebula M2-9 [PDF]

Journal of Astronomy and Space Sciences, 2001
In the spectrum of the young bipolar planetary nebula M2-9 obtained from the 1.5 m telescope at the Cerro Tololo Inter-American Observatory, we detected the He~II feature at 6545 Å that are proposed to be formed via Raman scattering by atomic hydrogen ...
Hee-Won Lee, Young Woon Kang
doaj  

Planetary nebulae : getting closer to an unbiased binary fraction

, 2012
Why 80% of planetary nebulae are not spherical is not yet understood. The Binary Hypothesis states that a companion to the progenitor of the central star of a planetary nebula is required to shape the nebula and even for a planetary nebula to be formed ...
Bojicic, I., De Marco, O., Douchin, D., Frew, D. J., Hillwig, T. C., Jacoby, G. H., Jasniewicz, G., Parker, Q. A.   +7 more
core  

Quantifying Serpentinization‐Driven Remagnetization From Ridge Axis to Subduction Zone Using Quantum Diamond Microscopy

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract Diachronous ferromagnetic (sensu lato) mineral populations are often juxtaposed on micrometer‐to‐millimeter scales. This poses significant challenges for extracting reliable paleomagnetic information because standard methods measure bulk magnetic moments and cannot distinguish between magnetic minerals with overlapping demagnetization spectra.
Liang Qi, Adrian R. Muxworthy, Evelyn B. Baker, Xiaobin Cao, Simon Allerton, James F. J. Bryson, Yong Zhang   +6 more
wiley   +1 more source

Testing the binary hypothesis for the formation and shaping of planetary nebulae

, 2012
There is no quantitative theory to explain why a high 80% of all planetary nebulae are non-spherical. The Binary Hypothesis states that a companion to the progenitor of a central star of planetary nebula is required to shape the nebula and even for a ...
Bojicic, I., De Marco, O., Douchin, D., Frew, D. J., Hillwig, T. C., Jacoby, G. H., Jasniewicz, G., Parker, Q. A.   +7 more
core  

A self-consistent stellar and 3D nebular model for Planetary Nebula IC418

, 2009
We present a coherent stellar and nebular model reproducing the observations of the Planetary Nebula IC418. We want to test whether a stellar model obtained by fitting the stellar observations is able to satisfactory ionize the nebula and reproduce the ...
Aller, Aller, Beck, Bloecker, Buerger, C. Morisset, Cristallo, Ercolano, Escalante, Ferland, Fitzpatrick, García-Segura, Gesicki, Gesicki, Gutíerrez-Moreno, Guzmán, Handler, Henry, Hillier, Hillier, Hyung, Karakas, Keenan, Krueger, L. Georgiev, Macfarlane, Marigo, Mendez, Mendez, Monteiro, Patriarchi, Pauldrach, Pottasch, Prinja, Richer, Schmutz, Schönberner, Sharpee, Sharpee, Sterling, Tayal, Tayal, Vassiliadis, Wilson   +43 more
core   +1 more source

Business ethics, law and zemiology: The criminology of social and environmental harm

Business Ethics, the Environment &Responsibility, Volume 34, Issue 4, Page 1886-1896, October 2025.
Abstract This speculative paper introduces zemiology, an extension of radical criminology which explores why many ‘crimes’ are not ‘illegal’ by focussing on the problem of ‘social harm’. Zemiology insists that we should begin with social or environmental problems, and not allow their foreclosure by the distraction of whether a particular practice is ...
Robin Klimecki, Martin Parker
wiley   +1 more source

JWST/MIRI Study of the Enigmatic Mid-infrared Rings in the Planetary Nebula NGC 1514

The Astronomical Journal
While NGC 1514 is an elliptical, but complex, planetary nebula at optical wavelengths, it was discovered to have a pair of infrared-bright, axisymmetric rings contained within its faint outer shell during the course of the Wide-field Infrared Survey ...
Michael E. Ressler, Alba Aller, David Jones, Ryan M. Lau, Luis F. Miranda, Karen Willacy   +5 more
doaj   +1 more source

A statistical investigation into relationships between the IIE irons and the ordinary, F and “HH” chondrites

Meteoritics &Planetary Science, Volume 60, Issue 10, Page 2376-2400, October 2025.
Abstract It has been proposed that IIE iron meteorites formed through impact processes on a parent body that was composed of either the H chondrites or a much‐debated fourth ordinary chondrite group, the HH chondrites. To resolve this debate, we have compiled a large dataset for the ordinary chondrites, low‐fayalite ungrouped chondrites, and IIE irons,
Rachel S. Kirby, Penelope L. King, Andrew G. Tomkins   +2 more
wiley   +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, Markku Väisänen, Jussi S. Heinonen, Ermei Mäkilä, Hugh O'Brien, Arto Peltola   +5 more
wiley   +1 more source

MULTI-STAGES OPTIMIZED PHOTOIONIZATION MODELLING OF PLANETARY NEBULA LMC SMP-21

Odessa Astronomical Publications, 2012
The new approximation expression for the representation of gas density distribution in planetary nebulae envelopes was proposed. The new multi-stages method for the caclulation of the chemical composition and physical parameters of planetary nebulae ...
B. Ya. Melekh, V. V. Holovatyy, N. V. Havrylova, M. M. Sokil, N. L. Tyshko, A. V. Demchyna   +5 more
doaj   +1 more source