Results 91 to 100 of about 4,353 (222)

Molecules, Dust and the Structure of Circumstellar Envelopes

, 2007
. Radio continuum and spectral line emission from the photospheres and circumstellar shells of evolved cool giant stars trace their size, shape and mass loss history.
G. R. Knapp
core  

Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514

The Astrophysical Journal Letters
We report the discovery of CO _2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remains stable over
Kate Y. L. Su, Attila Moór, Chengyan Xie, Ilaria Pascucci, George H. Rieke, Ágnes Kóspál, Mark C. Wyatt, Péter Ábrahám, Luca Matrà, Zoe Roumeliotis, D. J. Wilner   +10 more
doaj   +1 more source

The dusty envelopes of asymptotic giant branch stars with ultraviolet excesses

Astronomy & Astrophysics
Context. Roughly spherical envelopes around asymptotic giant branch (AGB) stars transform into the highly asymmetric morphologies observed in planetary nebulae.
Alonso-Hernández J., Sánchez Contreras C., Sahai R., Sanz-Forcada J.   +3 more
doaj   +1 more source

Warping, dust settling and dynamics of protoplanetary disks

, 2009
The research presented in this thesis investigates several aspects of the evolutionary processes of T Tauri stars and their accompanying circumstellar disks.
O'Sullivan, Mark George
core  

Circumstellar gas and dust in 68 Ophiuchi (A0IVe) [PDF]

, 1995
We present photometry and spectroscopy of the A0IVe star 68 Ophiuchi, for which Vidal-Madjar et al. (1993) suspected the presence of a circumstellar disc of material similar to that found around beta Pic.
Sandell, G., Bontekoe, T.R., Oudmaijer, R.D., Waters, L.B.F.M., Bontekoe, Tj. R., Geballe, T.R., Grady, C. A., Vega, R., van den Ancker, M. E., Waters, L. B. F. M., Oudmaijer, R. D., Baas, F., van Winckel, H., van den Ancker, M.E., van der Bliek, N.S., Thé, P. S., Kester, D.J.M., Geballe, T. R., Grady, C.A., Kester, D. J. M., van der Bliek, N. S., The, P.S.   +21 more
core   +1 more source

A Possible Indication of Metallic Iron in White Dwarf Dusty Disks from Their “Dirtiness”

The Astrophysical Journal
Polluted white dwarfs provide unique constraints on the elemental compositions of planetary bodies. The tidal disruption of accreting bodies is thought to form circumstellar dusty disks, whose emission spectra could offer additional insights into the ...
Ayaka Okuya, Satoshi Okuzumi, Aki Takigawa, Hanako Enomoto   +3 more
doaj   +1 more source

Circumstellar dust around FU Orionis stars [PDF]

Symposium - International Astronomical Union, 1987
It is immediately apparent from IRAS and other far infrared data (figure 1) that all known FU Orionis stars, or fuors, are associated with substantial amounts of cool circumstellar dust.The pre-outburst magnitudes for V1057 Cyg indicate that this star was immersed in circumstellar dust already before its flare-up in 1969–1970, and hence that this dust ...
openaire   +1 more source

SpS1-Circumstellar disks & their evolution: Dust

, 2009
Circumstellar disks are an intrinsic part of star formation and are also where planets form, migrate, and where the materials capable of producing life-bearing worlds are produced.
Carol A. Grady
core   +1 more source

The Morphology of the Asteroidal Dust around White Dwarf Stars: Optical and Near-infrared Pulsations in G29-38

The Astrophysical Journal
More than 36 yr have passed since the discovery of the infrared excess from circumstellar dust orbiting the white dwarf G29-38, which at 17.5 pc it is the nearest and brightest of its class.
Ted von Hippel, J. Farihi, J. L. Provencal, S. J. Kleinman, J. E. Pringle, A. Swan, G. Fontaine, J. J. Hermes, J. Sargent, Z. Savery, W. Cooper, V. Kim, V. Kozyreva, M. Krugov, A. Kusakin, A. Moss, W. Ogloza, Erika Pakštienė, A. Serebryanskiy, Eda Sonbas, B. Walter, M. Zejmo, S. Zola   +22 more
doaj   +1 more source

Very Late-time JWST and Keck Spectra of the Oxygen-rich Supernova 1995N

The Astrophysical Journal
We present new JWST/MIRI Medium Resolution Spectroscopy and Keck spectra of SN 1995N obtained in 2022–2023, more than 10,000 days after the supernova (SN) explosion. These spectra are among the latest direct detections of a core-collapse SN, both through
Geoffrey C. Clayton, R. Wesson, Ori D. Fox, Melissa Shahbandeh, Alexei V. Filippenko, Bryony Nickson, Michael Engesser, Schuyler D. Van Dyk, WeiKang Zheng, Thomas G. Brink, Yi Yang, Tea Temim, Nathan Smith, Jennifer Andrews, Chris Ashall, Ilse De Looze, James M. Derkacy, Luc Dessart, Michael Dulude, Eli Dwek, Ryan J. Foley, Suvi Gezari, Sebastian Gomez, Shireen Gonzaga, Siva Indukuri, Jacob Jencson, Joel Johansson, Mansi Kasliwal, Zachary G. Lane, Ryan Lau, David Law, Anthony Marston, Dan Milisavljevic, Richard O’Steen, Justin Pierel, Armin Rest, Arkaprabha Sarangi, Matthew Siebert, Michael Skrutskie, Lou Strolger, Tamás Szalai, Samaporn Tinyanont, Qinan Wang, Brian Williams, Lin Xiao, Szanna Zsíros   +45 more
doaj   +1 more source