Results 21 to 30 of about 207,371 (176)
Planetary Nebulae as Sources of Chemical Enrichment of the Galaxy
Frontiers in Astronomy and Space Sciences, 2022 During the late asymptotic giant branch (AGB) phase of stellar evolution, the element carbon is created through the triple-α nuclear reaction. This is followed by the synthesis of other heavy elements via neutron capture in the core and the dredge-up of ...
Sun Kwok, Sun Kwok
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Chemical Synthesis in the Circumstellar Environment
GalaxiesWe discuss the spectral distinctions between B[e] stars and compact planetary nebulae. The differentiation between proto-planetary nebulae, transition objects between the asymptotic giant branch and planetary nebulae, and reflection nebulae in binary ...
Sun Kwok
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On the alignment of PNe and local magnetic field at the Galactic centre : magnetohydrodynamical numerical simulations [PDF]
, 2014 DFG thanks the European Research Council (ADG-2011 ECOGAL), and Brazilian agencies CNPq (no. 300382/2008-1), CAPES (3400-13-1) and FAPESP (no.2011/12909-8) for financial support.
Monteiro, H., Falceta-Gonçalves, D.
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Mining of the Milky Way Star Archive Gaia-DR2. Searching for Binary Stars in Planetary Nebulae
Proceedings, 2020 The aim of this work is to search for binary stars associated to planetary nebulae (ionized stellar envelopes in expansion), by mining the astronomical archive of Gaia DR2, that is composed by around 1.7 billion stellar sources.
Iker González-Santamaría +4 more
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Planetary Nebulae Embryo after a Common Envelope Event
Galaxies, 2018 In the centers of some planetary nebulae are found close binary stars. The formation of those planetary nebulae was likely through a common envelope event, which transformed an initially-wide progenitor binary into the currently observed close binary ...
Natalia Ivanova, Jose L. A. Nandez
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Planetary Nebulae and the Ionization of the Interstellar Medium in Galaxies
Frontiers in Astronomy and Space Sciences, 2022 We discuss the role of planetary nebulae and their progeny in galaxy context in terms of ionization of the galaxy interstellar medium. This regards ionized gas outside the disk of spiral galaxies, the diffuse ionized medium in spiral galaxies, and the ...
Grażyna Stasińska +2 more
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Imaging polarimetry of planetary and proto-planetary nebulae [PDF]
, 1997 Optical imaging polarimetry has been performed on a small sample of objects which are associated with that stage of stellar evolution occurring between the Asymptotic Giant Branch and full Planetary Nebula. Three such systems are considered, specifically,
Bowlzer, S.L., Bowlzer, S. L.
core
International Journal of Management Reviews, EarlyView.Abstract This comparative literature review explores how an expanding body of interdisciplinary post‐growth literature aligns, extends or challenges ecocentric Corporate Sustainability (eCS) research in management (i.e., rooted in systems thinking, emphasising planetary boundaries, ecological limits and embeddedness).
Gianluigi Narciso, Yanfei Hu
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Journal of Phycology, EarlyView.Abstract The genus Paulinella represents a rare, independent case of primary endosymbiosis, providing a unique system to study the early stages of organelle evolution. Here, we expand current understanding of primary plastid endosymbiosis through the discovery and characterization of two novel photosynthetic amoebae, Paulinella marae sp. nov.
Julia Van Etten +9 more
wiley +1 more source
Protoplanetary Nebulae Are Not the Precursors of Planetary Nebulae with Close Binary Central Stars
The Astronomical JournalProtoplanetary nebulae are considered to be the evolutionary link between asymptotic giant branch stars and planetary nebulae. They possess many of the physical characteristics expected of such a link and provide valuable information about the ...
Todd C. Hillwig +2 more
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