Results 61 to 70 of about 1,535 (206)
On the Origin of the North Celestial Pole Loop
The Astrophysical Journal, 2023 The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early-stage precursors of star formation. Uncovering its origin is key to understanding the dynamical mechanisms that control the evolution of its contents. In this study,
Antoine Marchal, Peter G. Martin
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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
Dust models post- Planck : constraining the far-infrared opacity of dust in the diffuse interstellar medium [PDF]
, 2015 International audienceAims: We compare the performance of several dust models in reproducing the dust spectral energy distribution (SED) per unit extinction in the diffuse interstellar medium (ISM).
Ysard, N. +17 more
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The Chocolate Chip Cookie Model: Dust-to-metal Ratio of H ii Regions
The Astrophysical Journal Letters, 2023 Using a sample of face-on star-forming galaxies selected from the Sloan Digital Sky Survey, we statistically derive the typical optical depth τ _cl of individual H ii regions based on the “Chocolate Chip Cookie” model of Lu et al. (2022).
Jiafeng Lu +3 more
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Limitations of the modified blackbody fit method for determining molecular cloud properties
Astronomische Nachrichten, Volume 345, Issue 4, May 2024.Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley +1 more source
Extinction Curves, Distances, and Clumpiness of Diffuse Interstellar Dust Clouds
The Astronomical Journal, 1999 22 pages, 13 figures (postscript, gif, jpg). Accepted for publication in the Astronomical Journal, scheduled for the May 1999 issue. Full resolution postscript versions of all figures are available at http://www.ucolick.org/~arpad/
Szomoru, Arpad, Guhathakurta, Puragra
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Extinction and dust properties in a clumpy medium [PDF]
, 2015 The dust content of the universe is primarily explored via its interaction with stellar photons, which are absorbed or scattered by the dust, producing the effect known as interstellar extinction. However, owing to the physical extension of the observing
R. Siebenmorgen, P. Scicluna
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Chiroptical properties of membrane glycerophospholipids and their chiral backbones
Chirality, Volume 36, Issue 3, March 2024.Examination of the interaction of glycerophospholipids with circularly polarized light suggests that direct induction of symmetry breaking to membrane lipids by chiral photons is unlikely. However, anisotropy spectra of certain analogs indicate potential alternative mechanisms for the origins of membrane lipid homochirality, providing insights into the
Jana Bocková +4 more
wiley +1 more source
Observational constraints on interstellar dust models [PDF]
, 1989 No single model has been able to account for all of the observed spectroscopic properties of interstellar or circumstellar dust. The reason for this is that, despite the agreement that the grains are composed of silicaceous/metal oxide and carbonaceous ...
Hackwell, James A. +2 more
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Extinction by stratified interstellar dust grains
, 2010 We compute the optical properties of spherical dust grains composed of hollow silicate cores coated with two carbonaceous layers, the inner layer of mostly graphitic sp2 carbon and the outer layer of sp3 polymeric amorphous carbon, and explore the consequences on modelled interstellar extinction curves.
M. A. Iatì +6 more
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