Non-stoichiometric amorphous magnesium-iron silicates in circumstellar dust shells. Dust growth in outflows from supergiants [PDF]
Astronomy & Astrophysics, 2020 Aims. We study the growth of dust in oxygen-rich stellar outflows in order to find out to which extent dust growth models can quantitatively reconcile with the quantities and nature of dust as derived from observations of the infrared emission from ...
H. P. Gail +3 more
openalex +3 more sources
Early evolution of viscous and self-gravitating circumstellar disks with a dust component [PDF]
Astronomy & Astrophysics, 2018 Context. Aims. The long-term evolution of a circumstellar disk starting from its formation and ending in the T Tauri phase was simulated numerically with the purpose of studying the evolution of dust in the disk with distinct values of the viscous α ...
Eduard I. Vorobyov +4 more
openalex +3 more sources
ON ABSORPTION BY CIRCUMSTELLAR DUST, WITH THE PROGENITOR OF SN 2012aw AS A CASE STUDY [PDF]
, 2012 We use the progenitor of SN 2012aw to illustrate the consequences of modeling circumstellar dust using Galactic (interstellar) extinction laws that (1) ignore dust emission in the near-IR and beyond, (2) average over dust compositions, and (3 ...
C. Kochanek +8 more
semanticscholar +3 more sources
Imaging the circumstellar dust around AGB stars with PolCor [PDF]
, 2011 Aims. The aim of this paper is to investigate how the new imaging Polarimeter and Coronograph (PolCor) at the Nordic Optical Telescope** (NOT) can be used in the study of circumstellar structures around AGB stars. The purpose is to prepare for a study of
S. Ramstedt +4 more
openalex +3 more sources
Circumstellar dust shells of hot post-AGB stars [PDF]
, 2004 Using a radiative transfer code (DUSTY) parameters of the circumstellar dust shells of 15 hot post-AGB stars have been derived. Combining the optical, near and far-infrared (ISO, IRAS) data of the stars, we have reconstructed their spectral energy ...
G. Gauba, M. Parthasarathy
openalex +3 more sources
Is Phenylnitrene a Missing Link in the Formation of Polycyclic Aromatic Nitrogen Heterocycles? [PDF]
Angew Chem Int Ed EnglA 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 +6 more
europepmc +2 more sources
Observing dust settling and coagulation in circumstellar discs: Selected constraints from high resolution imaging [PDF]
, 2010 Circumstellar discs are expected to be the nursery of planets. Grain growth within such discs is the first step in the planet formation process in the core-accretion gas-capture scenario.
Juergen Sauter, S. Wolf
openalex +3 more sources
Laboratory measurement of optical constants of solid SiO and application to circumstellar dust [PDF]
, 2013 Context. Silicate minerals belong to the most abundant solids that form in cosmic environments. Their formation requires that a suffi cient number of oxygen atoms per silicon atom is freely available.
Steffen Wetzel +4 more
openalex +3 more sources
CIRCUMSTELLAR DUST AROUND AGB STARS AND IMPLICATIONS FOR INFRARED EMISSION FROM GALAXIES [PDF]
, 2015 Stellar population synthesis (SPS) models are used to infer many galactic properties including star formation histories, metallicities, and stellar and dust masses.
Alexa Villaume +2 more
openalex +3 more sources
The first 8–13μm spectra of globular cluster red giants: circumstellar silicate dust grains in 47 Tucanae (NGC 104) [PDF]
, 2006 We present 8-13 micron spectra of eight red giants in the globular cluster 47 Tucanae (NGC 104), obtained at the European Southern Observatory 3.6m telescope. These are the first mid-infrared spectra of metal-poor, low-mass stars.
J. Th. van Loon +7 more
openalex +3 more sources