Results 11 to 20 of about 14,221 (195)
On the Persistence of Small Regions of Vorticity in the Protoplanetary Nebula [PDF]
The Astrophysical Journal, 2000 The fate of small regions of vorticity in a barotropic model of the protoplanetary nebula is investigated over thousands of years using a finite difference model. It is found that the coherence time for a small island of vorticity depends on its size, strength, orientation, and radial location in the nebula. Anticyclonic vorticity retains its coherence
Sanford S. Davis +2 more
openaire +3 more sources
Igneous processes in the small bodies of the Solar System II: Small satellites and dwarf planets [PDF]
iScienceSummary: Evidence of hot and cold igneous processes has been reported in small satellites and dwarf planets of the Solar System. Olivine and pyroxenes were detected in the spectral bands of both small satellites and dwarf planets.
Giovanni Leone, Hiroyuki Tanaka
doaj +2 more sources
Polarimetry of the protoplanetary nebula AFGL 2688 [PDF]
Astronomy Reports, 2004 Our spectroscopic (with resolution R=75 000) and spectropolarimetric (R=15 000) observations with the 6-m telescope of the Special Astrophysical Observatory have enabled us to distinguish photospheric and circumstellar features in the optical spectrum of the bipolar protoplanetary nebula AFGL 2688 for the first time.
M. V. Yushkin +4 more
openaire +3 more sources
Dynamics and Growth of Dust Grains in the Protoplanetary Nebula [PDF]
Publications of the Astronomical Society of the Pacific, 2002 In the standard scenario of planet formation, the planetesimals grow from primordial dust grains of interstellar origin embedded in a gas disk, the so-called protoplanetary nebula. Large-scale gaseous structures, such as spiral waves and vortices, are likely to survive for a large number of rotation periods and can strongly influence the dynamics and ...
C. de la Fuente Marcos
openaire +3 more sources
Trigonometric parallax of the protoplanetary nebula OH 231.8+4.2 [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractWe report trigonometric parallx measurements for H2O masers around the protoplanetary nebula OH 231.8+4.2 carried out with the Very Long Baseline Array. Based on astrometric monitoring for 1 year, we measured a trigonometric parallax of 0.89 ± 0.04 mas, corresponding to a distance of 1.12+0.05−0.05 kpc.
Choi +7 more
+6 more sources
Condensation Front Migration in a Protoplanetary Nebula [PDF]
The Astrophysical Journal, 2005 Condensation front dynamics are investigated in the mid-solar nebula region. A quasi-steady model of the evolving nebula is combined with equilibrium vapor pressure curves to determine evolutionary condensation fronts for selected species. These fronts are found to migrate inwards from the far-nebula to final positions during a period of 10(exp 7 ...
Sanford S. Davis
openaire +4 more sources
Evidence for Magnetically‐Driven Accretion in the Distal Solar System
AGU AdvancesPaleomagnetic measurements of meteorites indicate that magnetic fields existed in the inner solar nebula capable of driving accretion at rates similar to those observed for young stellar objects with protoplanetary disks.
Elias N. Mansbach +11 more
doaj +2 more sources
Chondrule Survivability in the Solar Nebula [PDF]
The Astrophysical JournalThe lifetime of millimeter-sized dust grains, such as chondrules, in the nominal solar nebula model is limited to ∼10 ^5 yr, due to an inward drift driven by gas drag.
Tetsuo Taki, Shigeru Wakita
doaj +2 more sources
UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS [PDF]
Galaxies, 2018 Collimated outflows and jets play a critical role in shaping planetary nebulae (PNe), especially in the brief transition from a spherical AGB envelope to an aspherical PN, which is called the protoplanetary nebula (pPN) phase.
Xuan Fang +5 more
doaj +2 more sources
Molecules in the Carbon-rich Protoplanetary Nebula CRL 2688 [PDF]
The Astrophysical Journal Supplement Series, 2022 Abstract We present observations of the carbon-rich protoplanetary nebula CRL 2688 made with the Institut de Radioastronomie Millimétrique 30 m telescope in the 3 and 2 mm bands. In total, 196 transition lines belonging to 38 molecular species and isotopologues are detected, among which, to the best of our knowledge, 153 transition lines
Jian-Jie 建杰 Qiu 邱 +3 more
openaire +3 more sources