Results 1 to 10 of about 42,848 (232)
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
Jianjie Qiu +3 more
semanticscholar +6 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.
В. Г. Клочкова +3 more
semanticscholar +3 more sources
Trigonometric Parallax of the Protoplanetary Nebula OH 231.8+4.2 [PDF]
Proceedings of the International Astronomical Union, 2012 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.
Yoon Kyung Choi +3 more
semanticscholar +4 more sources
Igneous processes in the small bodies of the Solar System I. Asteroids and comets [PDF]
iScience, 2023 Summary: Igneous processes were quite widespread in the small bodies of the Solar System (SBSS) and were initially fueled by short-lived radioisotopes, the proto-Sun, impact heating, and differentiation heating.
Giovanni Leone, Hiroyuki K.M. Tanaka
doaj +2 more sources
Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula [PDF]
Nature Communications, 2023 The short-lived radionuclide aluminium-26 (26Al) isotope is a major heat source for early planetary melting. The aluminium-26 – magnesium-26 (26Al-26Mg) decay system also serves as a high-resolution relative chronometer.
Evgenii Krestianinov +11 more
doaj +2 more sources
The Integral Field View of the Orion Nebula [PDF]
Advances in Astronomy, 2014 This paper reviews the major advances achieved in the Orion Nebula through the use of integral field spectroscopy (IFS). Since the early work of Vasconcelos and collaborators in 2005, this technique has facilitated the investigation of global properties ...
Adal Mesa-Delgado
doaj +4 more sources
How unique is the protoplanetary nebula star HR 4049? [PDF]
Symposium - International Astronomical Union, 1987 The late B-supergiant HR 4049 is peculiar in different respects: (1) It is located far from the galactic plane (b = 23°); (2) It is a variable with a large amplitude and on a long time scale (Waelkens and Rufener, 1983); (3) It has a spectacular infrared excess (Lamers et al., 1986).
C. Waelkens, L. B. F. M. Waters
openalex +2 more sources
Destruction of protoplanetary discs in the Orion Nebula Cluster [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We use numerical N-body simulations of the Orion Nebula Cluster (ONC) to investigate the destruction of protoplanetary disks by close stellar encounters and UV radiation from massive stars. The simulations model a cluster of 4000 stars, and we consider separately cases in which the disks have fixed radii of 100 AU and 10 AU.
Aylwyn Scally, Charlotte Clarke
openalex +4 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
Abundant microchondrules in 162173 Ryugu suggest a turbulent origin for primitive asteroids [PDF]
Nature CommunicationsChondrules are a characteristic feature of primitive Solar System materials and are common in all primitive meteorites except the CI-chondrites. They are thought to form owing to melting of solid dust aggregates by energetic processing within the solar ...
Matthew J. Genge +7 more
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