Results 41 to 50 of about 55,496 (241)
SIZE AND SURFACE AREA OF ICY DUST AGGREGATES AFTER A HEATING EVENT AT A PROTOPLANETARY NEBULA [PDF]
, 2013 S. Sirono
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LINKING CHEMISTRY AND KINEMATICS IN THE MOLECULAR GAS OF PROTOPLANETARY NEBULA M1-92
Proceedings of the 2023 International Symposium on Molecular Spectroscopy, 2023 . Protoplanetary nebulae (PPNe) play a significant role in the evolution of low and intermediate mass stars, serving as the link between the asymptotic giant branch (AGB) and planetary nebulae phases.
Katherine Gold, Lucy Ziurys
semanticscholar +1 more source
Protoplanetary Disks in the Orion Nebula Cluster: Gas-disk Morphologies and Kinematics as Seen with ALMA [PDF]
Astrophysical Journal, 2020 We present Atacama Large Millimeter Array CO(3 − 2) and HCO+(4 − 3) observations covering the central 1.′5 × 1.′5 region of the Orion Nebula Cluster (ONC).
R. Boyden, J. Eisner
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Chemistry in Protoplanetary Nebulae [PDF]
Symposium - International Astronomical Union, 1992 We have investigated gas-phase chemistry in a remnant red giant wind, during transition to a planetary nebula, using the interacting stellar winds model. Rapid destruction by UV of most existing molecules is predicted, within ~ 100 yrs of the core star heating up, suggesting that the large molecules in CRL 618 may be destroyed within decades.
Tom J. Millar +2 more
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The Planetary Science Journal, 2023 Converging lines of evidence show that protoplanetary disks are complex environments hosting spatial and temporal variability at multiple scales.
Roger R. Fu +5 more
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The Companion to the Central Mira Star of the Protoplanetary Nebula OH 231.8+4.2
, 2004 C. Sánchez Contreras +2 more
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Chemistry in a protoplanetary nebula [PDF]
Monthly Notices of the Royal Astronomical Society, 1992 The gas-phase chemistry in the remnant superwind of a carbon-rich red giant star, during its transition to a planetary nebula, is investigated. The interacting stellar winds model is used. It is found that during the first few hundred years of transition, significant abundances of a few small molecules and ions (e.g. CH + , CH + 2 , CH + 3 , CH, CH 2
Howe, D.A., Millar, TJ, Williams, D.A.
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The Astrophysical Journal, 2023 Using self-consistent models of turbulent particle growth in an evolving protoplanetary nebula of solar composition, we find that recently proposed local metallicity and Stokes number criteria necessary for the streaming instability to generate ...
Paul R. Estrada, Orkan M. Umurhan
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HST STIS UV Spectroscopic Observations of the Protoplanetary Nebula Hen3-1475 [PDF]
Astrophysical Journal, 2018 We present UV spectra of the protoplanetary nebula (pPN) Hen 3-1475 obtained with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). Our deep, low-dispersion spectroscopy enables monochromatic imaging of Hen 3-1475
X. Fang, A. Castro, J. Toalá, A. Riera
semanticscholar +1 more source
The chemistry of protoplanetary nebulae [PDF]
Astronomy & Astrophysics, 2003 We describe the chemistry occurring in a dense slab of outwardly expanding gas in the post-AGB phase of stellar evolution. Despite the high flux of UV photons from the central star, the intrinsic dust extinction in the slab prevents rapid photodissociation and allows chemical reactions to make a variety of gas-phase species, some complex.
Albert A. Zijlstra +4 more
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