Results 61 to 70 of about 2,045,808 (218)
Gas-phase Molecules in Protoplanetary Nebulae with the 21 μm Emission Feature
The Astronomical JournalIt has been more than 30 years since the enigmatic 21 μ m emission feature was first discovered in protoplanetary nebulae (PPNs). Although dozens of different dust carrier candidates have been proposed, there is as yet no widely accepted one.
Jian-Jie Qiu +8 more
doaj +1 more source
Synthesis of organic compounds in the circumstellar environment [PDF]
, 2008 Through the techniques of millimeter-wave and infrared spectroscopy, over 60 species of gas-phase molecules and a variety of inorganic and organic solids have been detected in the short phase of stellar evolution between the asymptotic giant branch and ...
Kwok, S
core +1 more source
Effect of Matter Accretion on Lithium Enhancement of Giants
The Astrophysical JournalA subset of low-mass giants (
Xue-Feng Li +5 more
doaj +1 more source
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin +11 more
wiley +1 more source
Commentary on the role of polyoxometalates in nature cybernetic loop
Natural Sciences, Volume 4, Issue 2-3, June-July 2024.Polyoxometalates (POMs) are both synthetic and naturally occurring coordination compounds. In the biosphere, POMs can participate in many different life‐determining geochemical and biological processes. Future interdisciplinary research on POMs may reveal their potential for prebiotic and abiotic chemistry, as well as for the development of artificial ...
Kirill Yu. Monakhov
wiley +1 more source
The Astrophysical JournalWe present Very Large Array observations of 16 Type IIn and Type II-L supernovae (SNe IIn and SNe II-L) at ≈1000–7000 days after explosion, probing circumstellar matter (CSM) at distances >10 ^16 cm from the progenitor. At these radii, the data directly
Charles D. Kilpatrick +5 more
doaj +1 more source
Evolutionary Aspects of Circumstellar Matter in Binary Systems [PDF]
Symposium - International Astronomical Union, 1973 Several groups of close binary stars are considered in an attempt to explain their present state as a consequence of a large-scale mass transfer or mass loss in the past: Algol-like semidetached binaries, some shell stars (AX Mon), some binary X-ray sources (Cen X-3, Her X-1), the recurrent nova T CrB, helium-rich binaries v Sgr and KS Per, and the ...
openaire +1 more source
The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring
Astronomische Nachrichten, Volume 345, Issue 4, May 2024.Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux +2 more
wiley +1 more source
SN 2022jox: An Extraordinarily Ordinary Type II SN with Flash Spectroscopy
The Astrophysical JournalWe present high-cadence optical and ultraviolet (UV) observations of the Type II supernova (SN), SN 2022jox which exhibits early spectroscopic high-ionization flash features of H i , He ii , C iv , and N iv that disappear within the first few days after ...
Jennifer E. Andrews +22 more
doaj +1 more source
Supernova interactions with aspherical circumstellar material
Astronomy & AstrophysicsWe present upgraded detailed numerical calculations of supernova (SN) interactions with significantly aspherical circumstellar matter (CSM), primarily formed as a disc or bipolar lobes.
Kurfürst P. +7 more
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