Results 31 to 40 of about 2,045,808 (218)

Multi-periodic photospheric pulsations and connected wind structures in HD64760 [PDF]

, 2006
We report on the results of an extended optical spectroscopic monitoring campaign on the early-type B supergiant HD 64760 (B0.5 Ib) designed to probe the deep-seated origin of spatial wind structure in massive stars.
A. Kaufer, Stahl, O., R. K. Prinja, Prinja, R.K., D. Witherick, Witherick, D., O. Stahl, Kaufer, A.   +7 more
core   +1 more source

Circumstellar H2O in M-type AGB stars

, 2008
Surprisingly high amounts of H2O have recently been reported in the circumstellar envelope around the M-type AGB star W Hya. However, substantial uncertainties remain, as the required radiative transfer modelling is difficult due to high optical depths ...
Olofsson, Hans,, Maercker, Matthias, Schöier, Fredrik L., Maercker, Matthias,, Olofsson, Hans, Schöier, Fredrik, Sch\uf6ier, Fredrik   +6 more
core   +2 more sources

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS)

Astronomy & Astrophysics
Context. Asymmetries in debris discs provide unique clues to understand the evolution and architecture of planetary systems. Previous studies of debris discs at (sub)millimetre wavelengths have suggested the presence of asymmetries in a wide variety of ...
Lovell J. B., Hales A. S., Kennedy G. M., Marino S., Olofsson J., Hughes A. M., Mansell E., Matthews B. C., Pearce T. D., Sefilian A. A., Wilner D. J., Zawadzki B., Booth M., Bonduelle M., Brennan A., del Burgo C., Carpenter J. M., Cataldi G., Chiang E., Fehr A., Han Y., Henning Th., Krivov A. V., Luppe P., Marshall J. P., Mac Manamon S., Milli J., Moór A., Wyatt M. C., Ertel S., Jankovic M. R., Kóspál Á., MacGregor M. A., Matrà L., Pérez S., Weber P.   +35 more
doaj   +3 more sources

Radiative Acceleration of Dense Circumstellar Material in Interacting Supernovae

The Astrophysical Journal, 2023
Early-time light curves/spectra of some hydrogen-rich supernovae (SNe) provide solid evidence of the existence of confined, dense circumstellar matter (CSM) surrounding dying massive stars. We numerically and analytically study the radiative acceleration
Daichi Tsuna, Kohta Murase, Takashi J. Moriya   +2 more
doaj   +1 more source

Rings, Shells, and Arc Structures Around B[e] Supergiants. I. Classical Tools of Nonlinear Hydrodynamics

The Astrophysical Journal
Structures in circumstellar matter reflect both fast processes and quasi-equilibrium states. A geometrical diversity of emitting circumstellar matter is observed around evolved massive stars, in particular around B[e] supergiants.
Dieter H. Nickeler, Michaela Kraus
doaj   +1 more source

Diagnostic of the Symbiotic Stars Environment by Thomson, Raman and Rayleigh Scattering Processes

Acta Polytechnica CTU Proceedings, 2015
Symbiotic stars are long-period interacting binaries consisting of a cool giant as the donor star and a white dwarf as the acretor. Due to acretion of the material from the giant’s stellar wind, the white dwarf becomes very hot and luminous.
M. Sekeráš, A. Skopal
doaj   +1 more source

Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity

Small Structures, Volume 7, Issue 3, March 2026.
The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley   +1 more source

Diurnal Variability Modulates Episodic Convection in Hothouse Climates Over Ocean and Swamp‐Like Surface Conditions

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 2, February 2026.
Abstract Hot and moist “hothouse” climates occurred in Earth's past and are expected in Earth's far future climate, driven by increasing solar luminosity. In hothouse climate regimes, precipitation transitions from a quasi‐steady state, as in present‐day tropical convection, to an “episodic deluge” or relaxation‐oscillator (RO) regime where ...
Namrah Habib, Guy Dagan, Nathan Steiger
wiley   +1 more source

Exploring the Effects of Reduced Gravitational Field Impacts on Convective Heat Transfer: A Comprehensive Review

Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.
ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey, Muhammad Ashraf, A. M. Rashad, Ali J. Chamkha   +3 more
wiley   +1 more source

Jacobi Hofschauspieler als Mephisto / [fotografiert von:] Gebrüder Matter [PDF]

, 1870
JACOBI HOFSCHAUSPIELER ALS MEPHISTO / [FOTOGRAFIERT VON:] GEBRÜDER MATTER [Künstlerfotografien zum Faustthema : Darsteller und Darstellerinnen des "Faust"] (-) Jacobi Hofschauspieler als Mephisto / [fotografiert von:] Gebrüder Matter (63) (1)
Matter
core