Results 51 to 60 of about 23,039 (206)

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

PHL 932: When Is a Planetary Nebula Not a Planetary Nebula? [PDF]

Publications of the Astronomical Society of Australia, 2010
AbstractThe emission nebula around the subdwarf B (sdB) star PHL 932 is currently classified as a planetary nebula (PN) in the literature. Based on a large body of multi-wavelength data, both new and previously published, we show here that this low-excitation nebula is in fact a small Strömgren sphere (Hii region) in the interstellar medium around this
Parker, Quentin A., Frew, David J., Madsen, Gregory J., O'Toole, Simon J.   +3 more
openaire   +4 more sources

Aggregation and the Structure of Value

Noûs, EarlyView.
ABSTRACT Roughly, the view I call “Additivism” sums up value across time and people. Given some standard assumptions, I show that Additivism follows from two principles. The first says that how lives align in time cannot, in itself, matter. The second says, roughly, that a world cannot be better unless it is better within some period or another.
Weng Kin San
wiley   +1 more source

The evolution of planetary nebulae VII. Modelling planetary nebulae of distant stellar systems

, 2010
By means of hydrodynamical models we do the first investigations of how the properties of planetary nebulae are affected by their metal content and what can be learned from spatially unresolved spectrograms of planetary nebulae in distant stellar systems.
Jacob, R., Sandin, C., Schönberner, D., Steffen, M.   +3 more
core   +1 more source

Planetary nebulae

37 pages, 25 figures; this is a pre-print of a chapter for the Encyclopedia of Astrophysics (edited by I. Mandel, section editor F.R.N.
De Marco, Orsola, Aleman, Isabel, Akras, Stavros   +2 more
openaire   +2 more sources

Common-envelope shaping of planetary nebulae – IV. From protoplanetary to planetary nebula

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We present 2D hydrodynamical simulations of the transition of a protoplanetary nebula (PPN) to a planetary nebula for central stars in binary systems that have undergone a common-envelope event. After 1000 yr of magnetically driven dynamics (PPN phase), a line-driven stellar wind is introduced into the computational domain and ...
García-Segura, Guillermo, Taam, Ronald E., Ricker, Paul M.   +2 more
openaire   +2 more sources

Combustion and Pyrolysis EA‐IRMS Techniques to Determine the δ2H of Diamonds

Rapid Communications in Mass Spectrometry, Volume 40, Issue 10, 30 May 2026.
ABSTRACT Rationale Diamonds are generally considered to be metasomatic minerals originating from the Earth's mantle. They formed through the interaction of carbon‐bearing fluids or melts with the surrounding deep lithology. Most knowledge about the formation of diamonds comes from studying their mineral inclusions or stable isotopes.
François Fourel, Christophe Lécuyer, Emilie Thomassot, Etienne Deloule, Charles Ojeimi   +4 more
wiley   +1 more source

Molecular Hydrogen Microstructures in Planetary Nebulae

Galaxies, 2020
Molecular hydrogen (H 2 ) emission is commonly detected in planetary nebulae (PNe), specially in objects with bipolar morphologies. New studies showed that H 2 gas is also packed in microstructures embedded in PNe of any morphological type.
Stavros Akras, Denise R. Gonçalves, Gerardo Ramos-Larios, Isabel Aleman   +3 more
doaj   +1 more source

Jungian categories as modes of reading: The case of Graham Greene's The Heart of the Matter and Aldous Huxley's Time Must Have a Stop

Orbis Litterarum, Volume 81, Issue 2, Page 89-110, April 2026.
Abstract This essay advocates renewed attention toward Jungian literary criticism, emphasizing its unique and creative perspectives on both fictional worlds and on reading. A fresh turn to Jungian criticism offers, in particular, valuable insight for texts on the peripheries of the canon.
Edsel Parke
wiley   +1 more source

Planetary nebulae, tracers of stellar nucleosynthesis

, 2006
We review the information that planetary nebulae and their immediate progenitors, the post-AGB objects, can provide to probe the nucleosynthesis and mixing in low and intermediate mass stars.
Balser, Balser, Becker, Burbidge, Charbonnel, Charbonnel, Charbonnel, Dinerstein, Forestini, G. Stasińska, Gustafsson, Górny, Górny, Hamann, Henry, Henry, Howard, Iben, Jacoby, Kingsburgh, Leisy, Leisy, Liu, Liu, Livio, Marigo, Marigo, Martín-Hernández, Moe, Napiwotzki, Palla, Palla, Peimbert, Peimbert, Perinotto, Peña, Prantzos, Péquignot, Rauch, Richer, Richer, Rubin, Sharpee, Soker, Stasińska, Stasińska, Sterling, Sterling, Sterling, Szczerba, Todt, Torres-Peinbert, Tovmassian, van den Hoek, Weidemann, Werner, Werner, Werner, Zhang, Zoccali   +59 more
core   +2 more sources