Results 21 to 30 of about 717 (184)
RR Tel: Determination of Dust Properties During Minimum Obscuration
Open Astronomy, 2012 the ISO infrared spectra and the SAAO long-term JHKL photometry of RR Tel in the epochs during minimum obscuration are studied in order to construct a circumstellar dust model.
Jurkić T., Kotnik-Karuza D.
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Dust Echoes from Luminous Fast Blue Optical Transients
The Astrophysical Journal, 2023 Luminous fast blue optical transients (LFBOTs) such as AT2018cow form a rare class of engine-powered explosions of uncertain origin. A hallmark feature of these events is radio/millimeter synchrotron emission powered by the interaction of fast ≳0.1 c ...
Brian D. Metzger, Daniel A. Perley
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Dust distribution in circumstellar shells [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractWe present numerical simulations of the hydrodynamical interactions that produce circumstellar shells. These simulations include several scenarios, such as wind-wind interaction and wind-ISM collisions. In our calculations we have taken into account the presence of dust in the stellar wind. Our results show that, while small dust grains tend to
van Marle, Allard Jan +3 more
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Circumstellar Dust Shells [PDF]
Symposium - International Astronomical Union, 1975 The optical properties of circumstellar graphite particle shells are considered. In the case of the optically thin shell (e.g. the shell of a RCB star after minimum), the temperature of the grains is calculated. It is shown that the dust shell always has a sharp inner border. The RCB phenomenon may be considered as a sudden moving of this border toward
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The Astrophysical Journal, 2023 ASASSN-21qj is a distant Sun-like star that recently began an episode of deep dimming events after no prior recorded variability. Here we examine archival and newly obtained optical and near-infrared data of this star.
Jonathan P. Marshall +8 more
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Molecular catastrophes and the formation of circumstellar dust [PDF]
Symposium - International Astronomical Union, 1987 Radiative instabilities due to simple molecules may convert chromospheric material into masering molecules and dust capable of being removed from the star by radiation pressure.
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The Astrophysical Journal, 2023 Dust coagulation in protoplanetary disks is not straightforward and is subject to several slowdown mechanisms, such as bouncing, fragmentation, and radial drift to the star.
Vitaly Akimkin +4 more
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Dust in circumstellar disks [PDF]
, 2006 This thesis presents observational and theoretical studies of the size and spatial distribution of dust particles in circumstellar disks. Using millimetre interferometric observations of optically thick disks around T Tauri stars, I provide conclusive evidence for the presence of millimetre- to centimetre-sized dust aggregates.
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Characteristics of Interstellar and Circumstellar Dust [PDF]
International Astronomical Union Colloquium, 1991 Abstract: This paper reviews our current knowledge of interstellar and circumstellar dust from an observational point of view. It is concluded that interstellar dust is highly heterogenous. It consist of a large number of different materials formed in a great variety of stellar birthsites under varying conditions and each with a highly isotopically ...
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Laboratory Astrophysics of Circumstellar Dust [PDF]
Symposium - International Astronomical Union, 1999 This paper summarizes laboratory investigations of Stardust analogue materials with special emphasis on the spectroscopic behaviour of silicates and carbonaceous materials. The review will also deal with the identification of the observed features in the dust spectra of AGB stars.
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