Results 81 to 90 of about 212,521 (235)
PAH formation in O-rich planetary nebulae [PDF]
, 2014 Polycyclic aromatic hydrocarbons (PAHs) have been observed in O-rich planetary nebulae towards the Galactic Bulge. This combination of oxygen-rich and carbon-rich material, known as dual-dust or mixed chemistry, is not expected to be seen around such ...
L. Guzman-Ramirez +4 more
semanticscholar +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 +3 more
doaj +1 more source
Catalog of Planetary Nebulae Detected by GALEX and Corollary Optical Surveys
The Astrophysical Journal Supplement Series, 2023 Planetary nebulae (PNs) consist of an ionized envelope surrounding a hot central star (CSPN) that emits mostly at ultraviolet (UV) wavelengths. UV observations, therefore, provide important information on both the CSPN and the nebula. We have matched the
M. A. Gómez-Muñoz +2 more
doaj +1 more source
Planetary nebulae and how to find them: A concise review
Frontiers in Astronomy and Space Sciences, 2022 This review provides useful background and information on how we find, vet and compile Planetary Nebulae (PNe) candidates and verify them. It presents a summary of the known Galactic PNe population and their curation in the Hong Kong/AAO/Strasbourg/Hα ...
Quentin A. Parker +1 more
doaj +1 more source
British Educational Research Journal, Volume 51, Issue 2, Page 826-847, April 2025.Abstract This study addresses the complex challenges of childhood obesity, food poverty and environmental degradation by developing a planetary health framework for school food in education. Drawing on Dewey's experiential learning philosophy, it adopts an integrative approach where school meals and food education converge.
Fatma Sabet, Steffen Böhm
wiley +1 more source
DUSTY DISKS AROUND CENTRAL STARS OF PLANETARY NEBULAE [PDF]
, 2014 Only a few percent of cool, old white dwarfs (WDs) have infrared excesses interpreted as originating in small hot disks due to the infall and destruction of single asteroids that come within the star's Roche limit.
G. Clayton +6 more
semanticscholar +1 more source
Irradiation Investigation: Exploring the Molecular Gas in NGC 7293
Galaxies, 2020 Background: Many planetary nebulae retain significant quantities of molecular gas and dust despite their signature hostile radiation environments and energetic shocks.
Jesse Bublitz +7 more
doaj +1 more source
Shock‐heated graphite in three IAB iron meteorites—Implications on the formation of diamond
Meteoritics &Planetary Science, Volume 60, Issue 4, Page 744-756, April 2025.Abstract Iron meteorites, originating from the deepest parts of their parent bodies and separated during major break‐up events, surprisingly rarely contain diamonds despite experiencing similar pressure–temperature conditions as diamond‐bearing ureilites. In this study, graphite from three non‐magmatic IAB iron meteorites Canyon Diablo, Campo del Cielo,
Oliver Christ +7 more
wiley +1 more source
Ionization correction factors for planetary nebulae – I. Using optical spectra [PDF]
, 2014 We compute a large grid of photoionization models that covers a wide range of physical parameters and is representative of most of the observed PNe. Using this grid, we derive new formulae for the ionization correction factors (ICFs) of He, O, N, Ne, S ...
G. Delgado-Inglada +6 more
semanticscholar +1 more source
Neutron-Capture Element Abundances in Planetary Nebulae
Galaxies, 2020 Nebular spectroscopy is a valuable tool for assessing the production of heavy elements by slow neutron(n)-capture nucleosynthesis (the s-process). Several transitions of n-capture elements have been identified in planetary nebulae (PNe) in the last few ...
N. C. Sterling
doaj +1 more source