Results 61 to 70 of about 772 (182)

MODELS OF CIRCUMSTELLAR MASERS IN BIPOLAR OUTFLOWS

Odessa Astronomical Publications, 2017
Sources of molecular maser radio emission in envelopes of late-type variable stars (red giants and supergiants) are considered. Radio and optical data on asymmetry of mass loss process in red giants are briefly reviewed.
G. M. Rudnitskij
doaj   +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

Penetration of Interstellar Dust Aggregates Into Circumstellar Dust Disks [PDF]

Symposium - International Astronomical Union, 2004
Interstellar dust particles, which are supposedly aggregates, penetrate dust disks around stars because of the star's motion relative to the surrounding interstellar medium (ISM). We discuss the interrelation of the physical properties of local interstellar dust, the relative motion of the star and the surrounding ISM, and the evolution of the ...
Hiroshi Kimura, Ingrid Mann
openaire   +1 more source

JWST Nebular Spectroscopy of SN 2023qov: Circumstellar Dust Emission in a Normal Type Ia Supernova

The Astrophysical Journal
We present panchromatic observations of the Type Ia supernova (SN Ia) 2023qov, ranging from ∼2 weeks before to ∼1 yr after maximum light. JWST near- and mid-infrared spectra at +276 and +363 days show ∼400 K dust emission that cools by ∼75 K between ...
Colin W. Macrie, Conor Larison, Huei Sears, Lindsey A. Kwok, Saurabh W. Jha, Mi Dai, Joel Johansson, Stéphane Blondin, Moira Andrews, K. Auchettl, Carles Badenes, Barnabás Barna, K. Azalee Bostroem, Thomas G. Brink, Kyle W. Davis, Joseph R. Farah, Alexei V. Filippenko, Ori D. Fox, Or Graur, Saarah Hall, D. Andrew Howell, Griffin Hosseinzadeh, Anders Jerkstrand, Réka Könyves-Tóth, C. Lidman, Keiichi Maeda, Kate Maguire, Bailey Martin, Adam Miller, Megan Newsome, Estefania Padilla Gonzalez, Abigail Polin, Armin Rest, Zoe A. Rosenberg, David J. Sand, Michaela Schwab, Matthew R. Siebert, Mridweeka Singh, Tamás Szalai, Tea Temim, Jacco H. Terwel, Brad E. Tucker, József Vinkó, Lingzhi Wang, Xiaofeng Wang, WeiKang Zheng   +45 more
doaj   +1 more source

A catalogue of high angular resolution and contrast polarimetric maps of 45 nearby AGB stars with SPHERE/ZIMPOL

Astronomy & Astrophysics
Aims. We present the largest catalogue of asymptotic giant branch (AGB) stars, 45 targets in total, observed in polarized light at high angular resolution (~20 milliarcsec).
Badolo Nekolgne Aymard, Lagadec Eric, N’Diaye Mamadou, Kam Sié Zacharie, McDonald Iain, Matter Alexis, Koulidiati Jean, Abe Lyu, Carbillet Marcel, Fusco Thierry   +9 more
doaj   +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, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source

Evidence for Dust Grain Growth in Young Circumstellar Disks [PDF]

Science, 2001
Hundreds of circumstellar disks in the Orion nebula are being rapidly destroyed by the intense ultraviolet radiation produced by nearby bright stars. These young, million-year-old disks may not survive long enough to form planetary systems. Nevertheless, the first stage of planet formation—the growth of dust grains into larger particles—may have begun ...
Throop, Henry B., Bally, John, Esposito, Larry W., McCaughrean, Mark J.   +3 more
openaire   +3 more sources

Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge

The Astrophysical Journal
We have detected the 10 μ m silicate feature and the 11.3 μ m crystalline forsterite feature in absorption in 21 oxygen-rich asymptotic giant branch stars in the Galactic bulge.
Steven R. Goldman, Jacco Th. van Loon, Olivia C. Jones, Joris A. D. L. Blommaert, Martin A. T. Groenewegen   +4 more
doaj   +1 more source

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

Dust-evacuated Zones near Massive Stars: Consequences of Dust Dynamics on Star-forming Regions

The Astrophysical Journal
Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics is frequently overlooked, with the common assumption being a constant ...
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić   +2 more
doaj   +1 more source