Results 31 to 40 of about 590 (185)
A study of four multipolar planetary nebulae in the Galactic bulge
Astronomy & AstrophysicsWe present infrared (IR) spectroscopic and optical morphological analyses of four multipolar young planetary nebulae (PNe) located in the Galactic bulge (GB) to investigate their dust characteristics and complex multi-lobed structures.
Wen Shi-Bo +5 more
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Analysis of Multiple Shell Planetary Nebulae Based on HST/WFPC2 Extended 2D Diagnostic Diagrams
Galaxies, 2018 The investigation of gaseous nebulae, emitting in forbidden lines, is often based extensively on diagnostic diagrams. The special physics of these lines often allows for disentangling with a few line ratios normally coupled thermodynamic parameters like ...
Daniela Barría, Stefan Kimeswenger
doaj +1 more source
Spectroscopy of Faint Emission Line Nebulae [PDF]
, 2002 6 pages, 3 figures, to be published in "Scientific Drivers for ESO Future VLT/VLTI Instrumentation", ESO Workshop ...
openaire +2 more sources
Xenoliths in meteorites: Insights into the dynamics of material exchange between asteroids
Meteoritics &Planetary Science, EarlyView.Abstract A minor fraction of meteorites contains xenoliths, that is, clasts that were formed on a different parent body than that of the host lithology. The occurrence of xenoliths is direct evidence for the exchange of material between asteroids, including exchanges between asteroids from the carbonaceous (CC) and non‐carbonaceous (NC) reservoirs ...
J. Gattacceca +17 more
wiley +1 more source
An Ensemble Study of Turbulence in Extended QSO Nebulae at z ≈ 0.5–1
The Astrophysical JournalTurbulent motions in the circumgalactic medium play a critical role in regulating the evolution of galaxies, yet their detailed characterization remains elusive. Using two-dimensional velocity maps constructed from spatially extended [O ii ] and [O iii ]
Mandy C. Chen +11 more
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On the Radio Emission of Hydrogen Nebulae [PDF]
Australian Journal of Physics, 1958 The interpretation of radio-frequency observations of H II regions is discussed with particular regard for the possible effects of random variations in the electron density and electron temperature through the nebulae. It is shown that such variations serve to alter the optical depth and that the conventional definition of the "emission measure ...
openaire +1 more source
Thermal history of an amoeboid olivine aggregate in the early solar nebula
Meteoritics &Planetary Science, EarlyView.Abstract Carbonaceous chondrites commonly contain amoeboid olivine aggregates (AOAs). Here, we investigated an AOA in the CR chondrite Y‐793261. This AOA contains an unstable assemblage of forsterite and quartz. We found a rare occurrence of enstatite and quantitatively discuss its formation process.
M. Kimura +3 more
wiley +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Apatite is often the most rare earth element (REE)‐enriched mineral in chondritic meteorites. REE enrichment and fractionation levels in apatite grains can give insight into the aqueous fluids in which they formed and the conditions prevailing within the host body. In this study, we applied synchrotron X‐ray fluorescence (SXRF) spectroscopy to
B. J. Tkalcec +17 more
wiley +1 more source
A Review of the Impact of Radiation Damage on the Mechanical Properties of Borosilicate Glasses
International Journal of Ceramic Engineering &Science, Volume 8, Issue 6, November 2026.Under irradiation, borosilicate glasses are modified at the atomic scale, including the formation of undercoordinated ions, that lead to changes in macroscopic properties. Decades of research have illuminated many aspects of the effects of radiation damage, but the complexity of these glasses leaves several unanswered questions.
Blas Pedro Uberuaga +2 more
wiley +1 more source
Circumgalactic Environments Around Distant Quasars 3C 9 and 4C 05.84
The Astrophysical JournalWe present results from the Quasar hosts Unveiled by high Angular Resolution Techniques survey studying the circumgalactic medium (CGM) by observing rest-frame UV emission lines Ly α , C iv , and He ii around two radio-loud quasars, 3C 9 ( z = 2.02) and ...
Sanchit Sabhlok +8 more
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