Results 11 to 20 of about 772 (182)

Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Our Galaxy [PDF]

Open Research Europe
As we learn more about the multi-scale interstellar medium (ISM) of our Galaxy, we develop a greater understanding for the complex relationships between the large-scale diffuse gas and dust in Giant Molecular Clouds (GMCs), how it moves,
Pamela Klaassen, Alessio Traficante, Maria Beltrán, Kate Pattle, Mark Booth, Joshua Lovell, Jonathan Marshall, Alvaro Hacar, Brandt Gaches, Caroline Bot, Nicolas Peretto, Thomas Stanke, Doris Arzoumanian, Ana Duarte Cabral, Gaspard Duchêne, David Eden, Antonio Hales, Jens Kauffmann, Patricia Luppe, Sebastian Marino, Elena Redaelli, Andrew Rigby, Álvaro Sánchez-Monge, Eugenio Schisano, Dmitry Semenov, Silvia Spezzano, Mark Thompson, Friedrich Wyrowski, Claudia Cicone, Tony Mroczkowski, Martin Cordiner, Luca Di Mascolo, Doug Johnstone, Eelco van Kampen, Minju Lee, Daizhong Liu, Thomas Maccarone, Amélie Saintonge, Matthew Smith, Alexander Thelen, Sven Wedemeyer   +40 more
doaj   +4 more sources

NIKA2 observations around LBV stars Emission from stars and circumstellar material [PDF]

EPJ Web of Conferences, 2020
Luminous Blue Variable (LBV) stars are evolved massive objects, previous to core-collapse supernova. LBVs are characterized by photometric and spectroscopic variability, produced by strong and dense winds, mass-loss events and very intense UV radiation ...
Ricardo Rizzo J., Ritacco Alessia, Bordiu Cristobal   +2 more
doaj   +1 more source

Comets and Circumstellar Dust [PDF]

Highlights of Astronomy, 2002
AbstractSpectra obtained with the Infrared Space Observatory ISO of the dusty disks surrounding young stars display several characteristics which suggest the presence of large amounts of cometary material during these early stages. Of special interest are crystalline silicates and hydrated silicates, which surprisingly appear to be present already in ...
Waelkens, C., Waters, L.B.F.M.
openaire   +2 more sources

Yellow Supergiants and Post-red Supergiant Evolution in the Large Magellanic Cloud

The Astronomical Journal, 2023
The empirical evidence for an upper-mass limit for the red supergiant (RSG) progenitors of the Type II-P SNe at about 18 MSun, raises questions about the fate of the most luminous, most massive RSGs.
Roberta M. Humphreys, Terry J. Jones, John C. Martin   +2 more
doaj   +1 more source

Dust Disks Around Young Stellar Objects [PDF]

Journal of Astronomy and Space Sciences, 2016
To reproduce the spectral energy distributions (SEDs) of young stellar objects (YSOs), we perform radiative transfer model calculations for the circumstellar dust disks with various shapes and many dust species.
Kyung-Won Suh
doaj   +1 more source

Composite circumstellar dust grains [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
We calculate the absorption efficiencies of composite silicate grains with inclusions of graphite and silicon carbide in the spectral range 5--25$\rm μm$. We study the variation in absorption profiles with volume fractions of inclusions. In particular we study the variation in the wavelength of peak absorption at 10 and 18$\rm μm$.
Gupta, Ranjan, Vaidya, Dipak B., Dutta, Rajeshwari   +2 more
openaire   +2 more sources

AGB Stars and Their Circumstellar Envelopes. I. the VULCAN Code

Universe, 2021
The interplay between AGB interiors and their outermost layers, where molecules and dust form, is a problem of high complexity. As a consequence, physical processes like mass loss, which depend on the chemistry of the circumstellar envelope, are often ...
Sergio Cristallo, Luciano Piersanti, David Gobrecht, Lucio Crivellari, Ambra Nanni   +4 more
doaj   +1 more source

Is Phenylnitrene a Missing Link in the Formation of Polycyclic Aromatic Nitrogen Heterocycles? [PDF]

Angew Chem Int Ed Engl
A new formation pathway for polycyclic aromatic nitrogen heterocycles (PANHs) has been found. The reaction of phenylnitrene and the propargyl radical leads to quinoline, proving that nitrenes are suitable precursors for nitrogen incorporation mechanisms.
Arns R, McClish R, Hemberger P, Bodi A, Bouwman J, Kasper T, Schleier D.   +6 more
europepmc   +2 more sources

Dust Coagulation in Oxygen-rich Circumstellar Outflows

The Astrophysical Journal, 2023
We show that the inefficient growth of SiO molecules on (SiO) _x dust grains prolongs the period of maximum dust nucleation in circumstellar outflows resulting in a several orders-of-magnitude increase in the dust density near the star.
John A. Paquette, Joseph A. Nuth, Frank T. Ferguson   +2 more
doaj   +1 more source

Astromineralogy of Circumstellar Oxide Dust [PDF]

Publications of the Astronomical Society of the Pacific, 2005
Oxides are among the less abundant species of cosmic dust (as compared, e.g., to silicates). Nevertheless, they are of decisive importance for the first stages of the condensation process in oxygen-rich circumstellar shells of AGB stars. The present work gives an overview of oxygen dust species that have been examined so far by means of astronomical ...
openaire   +4 more sources