Results 101 to 110 of about 386,435 (271)

The Type II SN 2025pht in NGC 1637: A Red Supergiant with Carbon-rich Circumstellar Dust as the First JWST Detection of a Supernova Progenitor Star

The Astrophysical Journal Letters
We present follow-up imaging and spectroscopy and pre-explosion imaging of SN 2025pht located in NGC 1637 at 12 Mpc. Our spectroscopy shows that SN 2025pht is a Type II supernova (SN) with broad lines of hydrogen and with minimal line-of-sight extinction
Charles D. Kilpatrick, Aswin Suresh, Kyle W. Davis, Maria R. Drout, Ryan J. Foley, Alexander Gagliano, Wynn V. Jacobson-Galán, Ravjit Kaur, Kirsty Taggart, Jason Vazquez   +9 more
doaj   +1 more source

AKARI Mission Program: Excavating Mass Loss History in Extended Dust Shells of Evolved Stars (MLHES) I. Far-IR Photometry

, 2018
We performed a far-IR imaging survey of the circumstellar dust shells of 144 evolved stars as a mission programme of the AKARI infrared astronomical satellite using the Far-Infrared Surveyor (FIS) instrument.
Izumiura, Hideyuki, Takita, Satoshi, Tomasino, Rachael L., Torres, Andrew J., Ueta, Toshiya, Yamamura, Issei   +5 more
core   +1 more source

AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362 [PDF]

, 2007
We report on preliminary results of AKARI observations of two globular clusters, NGC 104 and NGC 362. Imaging data covering areas of about 10×10 arcmin 2 centered on the two clusters were obtained with the Infrared Camera (IRC) at 2.4, 3.2, 4.1, 7.0, 9.0,
Y. Ita, T. Tanabé, N. Matsunaga, Y. Nakada, M. Matsuura, T. Onaka, H. Matsuhara, T. Wada, N. Fujishiro, D. Ishihara, H. Kataza, Woojung Kim, T. Matsumoto, H. Murakami, Y. Ohyama, F. Usui, S. Oyabu, I. Sakon, T. Takagi, K. Uemizu, M. Ueno, H. T. I. O. Space, Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, J. I. O. Astronomy, Graduate School of Science, T. U. O. Tokyo, Tokyo, Japan Japan, Mitaka, J. I. O. Astronomy, J. D. O. Physics, Japan Science, Astronomy, Graduate School of Arts, Sciences, Japan Office of Space Applications, Ibaraki, Japan.   +39 more
semanticscholar   +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

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

Strong dust processing in circumstellar discs around 6 RV Tauri stars. Are dusty RV Tauri stars all binaries?

, 2005
We present extended Spectral Energy Distributions (SEDs) of seven classical RV Tauri stars, using newly obtained submillimetre continuum measurements and Geneva optical photometry supplemented with literature data.
Alcock, Bessell, Bujarrabal, C. Dominik, Cardelli, Close, Dawson, Dominik, Gehrz, Gehrz, Giridhar, Goldsmith, H. Dejonghe, H. Van Winckel, Hakkila, Hildebrand, Holland, Jura, Jura, Jura, Kurucz, L. B. F. M Waters, , Lloyd Evans, Lloyd Evans, Maas, Matsuura, Neckel, Pollard, Pollard, S. De Ruyter, Savage, Shenton, Sopka, Sánchez Contreras, Van Winckel, Van Winckel, Van Winckel, Wahlgren, Waters   +38 more
core   +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

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

Dust Around T Tauri Stars [PDF]

Journal of Astronomy and Space Sciences, 2011
To reproduce the multiple broad peaks and the fine spectral features in the spectral energy distributions (SEDs) of T Tauri stars, we model dust around T Tauri stars using a radiative transfer model for multiple isothermal circumstellar dust shells. We
Kyung-Won Suh, Young-Joo Kwon
doaj   +1 more source

Morphological Properties of PPNs: Mid-IR and HST Imaging Surveys

, 2000
We will review our mid-infrared and HST imaging surveys of the circumstellar dust shells of proto-planetary nebulae. While optical imaging indirectly probes the dust distribution via dust-scattered starlight, mid-IR imaging directly maps the distribution
B Zuckerman, H Habing, Hrivnak, I Iben Jr, Meixner, S Kwok, SR Trammel   +6 more
core   +2 more sources