Results 131 to 140 of about 191,657 (282)
Meteoritics &Planetary Science, EarlyView.Abstract Meteorites are easily contaminated at the Earth's surface by microbial activity. Here, DNA extracts from two meteorite specimens and samples from curation laboratory surfaces are analyzed with amplicon sequencing, to understand microbial communities that contaminate meteorites and that may be resident in curation facilities.
Libby D. Tunney +4 more
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 +59 more
core +2 more sources
Abundances in Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1989 Good progress has been made since the last Symposium on the determination of planetary nebulae (PN) abundances. Notable features for modern abundance determinations include the availability of good collision strengths and transition probabilities (reviewed by C.
openaire +2 more sources
Magnesium phosphate in the Cold Bokkeveld (CM2) carbonaceous chondrite
Meteoritics &Planetary Science, EarlyView.Abstract Hydrous Mg‐phosphate was first described from astromaterials in particles returned from the C‐type asteroid Ryugu, and has subsequently been found in samples of the B‐type asteroid Bennu and CI1 carbonaceous chondrites. This phase may have been highly significant as a source of bioessential compounds for early Earth.
Martin R. Lee +2 more
wiley +1 more source
The morphology of dust emission in Planetary Nebulae and proto-Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1997 This review covers recent results from ground based mid-infrared (mid–IR; 8–25μm) imaging of thermal dust emission. The mid–IR images of proto–PNe show evidence for axially symmetric superwinds. In young PNe, the dust appears to be well mixed with the gas in the ionized gas regions.
openaire +2 more sources
Orbis Litterarum, EarlyView.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
The Planetary Nebulae Luminosity Function and distances to Virgo, Hydra I and Coma clusters
, 2012 The luminosity function of planetary nebulae populations in galaxies within 10-15 Mpc distance has a cut-off at bright magnitudes and a functional form that is observed to be invariant in different galaxy morphological types.
Arnaboldi, Magda +3 more
core +1 more source
Spectroscopy of Planetary Nebulae with Herschel: A Beginners Guide
Galaxies, 2018 A brief overview of the Herschel Space Telescope PACS and SPIRE spectrographs is given, pointing out aspects of working with the data products that should be considered by anyone using them.
Katrina Exter
doaj +1 more source
The Planetary Nebula Luminosity Function [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractAlthough the method has no theoretical explanation, the [Oiii]λ5007Å planetary nebula luminosity function (PNLF) is an extremely valuable tool for obtaining accurate (< 10%) extragalactic distances out to ~ 18 Mpc. Because the PNLF works in large galaxies of all Hubble types, it is one of the best tools we have for cross-checking the results
openaire +5 more sources
Imaging the transition between pre-planetary and planetary nebulae: integral field spectroscopy of hot post-AGB stars with NIFS [PDF]
, 2014 We present 2 to 2.4 micron integral field spectroscopy of a sample of hot post-AGB stars with early-B spectral types, using the NIFS instrument on Gemini North. These stars are just beginning to ionize their immediate environments and turn into planetary
T. Gledhill, K. Forde
semanticscholar +1 more source