Results 11 to 20 of about 650 (183)

The Circumstellar Matter of Cygnus X-3 [PDF]

Symposium - International Astronomical Union, 1998
X-ray source in Cyg X-3 is embedded in the photo-ionized circumstellar gas. Recombination edges and emission lines were detected by ASCA observation (Kawashima, Kitamoto 1996; Liedahl, Paerels 1996). The strength of the Kα line and the recombination edge are simply determined by the atomic process.
S. Kitamoto, K. Kawashima
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SN 2020bio: A Double-peaked, H-poor Type IIb Supernova with Evidence of Circumstellar Interaction

The Astrophysical Journal, 2023
We present photometric and spectroscopic observations of SN 2020bio, a double-peaked Type IIb supernova (SN) discovered within a day of explosion, primarily obtained by Las Cumbres Observatory and Swift.
C. Pellegrino, D. Hiramatsu, I. Arcavi, D. A. Howell, K. A. Bostroem, P. J. Brown, J. Burke, N. Elias-Rosa, K. Itagaki, H. Kaneda, C. McCully, M. Modjaz, E. Padilla Gonzalez, T. A. Pritchard, N. Yesmin   +14 more
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Star Formation and the Circumstellar Matter of Young Stellar Objects [PDF]

Symposium - International Astronomical Union, 1987
We propose that the formation of low mass stars in molecular clouds takes place in four stages. The first stage is the formation of slowly rotating cloud cores through the slow leakage of magnetic (and turbulent) support by ambipolar diffusion. These cores asymptotically approach quasistatic states resembling singular isothermal spheres, but such end ...
Frank H. Shu, Fred C. Adams
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NASA plans relevant to the study of circumstellar matter [PDF]

Symposium - International Astronomical Union, 1987
The Astrophysics program of the National Aeronautics and Space Administration of the United States emphasizes use of vehicles to obtain above-the-atmosphere observational advantages, including expanded electromagnetic frequency access, enhanced sensitivity resulting from reduced or eliminated atmospheric absorption of light and image smearing.
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Circumstellar matter as detected by IRAS - Some systematics [PDF]

Symposium - International Astronomical Union, 1987
Most of the sources noted by the Infrared Astronomical Satellite are, as expected, more or less normal cool giant stars, but a very large number of objects of earlier spectral type were also picked up. These cases must involve, in a variety of ways, circumstellar gas and dust.
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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

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

Circumstellar matter in the binary V Puppis

The Astrophysical Journal, 1976
Results are reported for Copernicus observations of the double-lined binary V Puppis in the wavelength region from 1155 to 1310 A with a resolution of 0.2 A. The sharp-lined UV absorption spectrum is found to provide a line of sight dominated by an apparently 'textbook' H II region in a Stromgren sphere surrounding the stars. Several characteristics of
D. G. York, B. Flannery, J. Bahcall
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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