Results 41 to 50 of about 4,999 (221)
Gaia DR2 Distances to Planetary Nebulae
Galaxies, 2020 The aim of this work is to examine distances to planetary nebulae (PNe) together with other properties that were derived from them, using the astrometry of Gaia Data Release 2 (DR2).
Iker González-Santamaría +4 more
doaj +1 more source
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
wiley +1 more source
The Search for Binaries in Post-Asymptotic Giant Branch Stars: Do Binary Companions Shape the Nebulae? [PDF]
Journal of Astronomy and Space Sciences, 2012 Binary companions are often invoked to explain the axial and point symmetry seen in the majority of planetary nebulae and proto-planetary nebulae (PPNs).
Bruce J. Hrivnak
doaj +1 more source
Molecular Envelopes of Planetary Nebulae and Proto-Planetary Nebulae [PDF]
International Astronomical Union Colloquium, 1994 As stars evolve up the asymptotic giant branch (AGB), they begin to lose mass at a high rate, and in the process they create extended circumstellar molecular envelopes. Since the transition from AGB to planetary nebula stages is of the order of 1000 yr, the remnant of such molecular envelopes should still be observable in pro to-planetary nebulae (PPN)
openaire +1 more source
Emerging Minds Journal for Student Research, 2023 This project compares two planetary nebulae (NGC 1514 and NGC 40) and studies the difference between them in their chemical composition. Observations of the two planetary nebulae were done at Clanfield Observatory with the 24-inch Ritchey-Chrétien telescope.
openaire +1 more source
Noble gases and nitrogen in material from asteroid Bennu
Meteoritics &Planetary Science, EarlyView.Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty +7 more
wiley +1 more source
The morphology and 3-D structures of the ionized, molecular, and dust components of planetary nebulae [PDF]
, 2009 The morphology of the ionized, molecular, and dust components of planetary nebulae can be traced by optical, infrared and mm/submm observations. Recent progresses in mm/submm interferometry, mid-infrared imaging with active optics, and optical imaging ...
Kwok, S
core
Radio morphologies of planetary nebulae [PDF]
, 1996 We have examined the morphologies of planetary nebulae observed in the recent very large array (VLA) surveys. The high angular resolution of the VLA has allowed the.extension of morphological classification to a much more compact population than before ...
Kwok, S, Aaquist, OB
core +1 more source
Proposed nomenclature for extragalactic planetary nebulae
, 2006 The ability to identify and distinguish between the wide variety of celestial objects benefits from application of a systematic and logical nomenclature.
Acker, A, Parker, QA
core +2 more sources
Millimetre Observations of Maser-Emitting Planetary Nebulae
Galaxies, 2022 Observations in the millimetre bands of maser-emitting planetary nebulae (PNe) are crucial to study their circumstellar molecular gas at the beginning of the PN phase.
Lucero Uscanga +9 more
doaj +1 more source