Results 121 to 130 of about 3,169 (205)

A circumstellar journey-physics and chemistry of AGB stellar winds

, 2008
The physics and chemistry of the envelopes of gas and dust that surround stars on the asymptotic giant branch are the subjects of this review. Estimates of stellar mass-loss rates in this phase, as determined through observations and modelling of ...
Olofsson, Hans,, Olofsson, Hans
core   +1 more source

Mid-infrared JWST Spectra of Carbon Stars in the Large Magellanic Cloud

The Astrophysical Journal
Mid-infrared spectra from the Medium Resolution Spectrometer (MRS) on the James Webb Space Telescope have revealed the molecular chemistry of carbon stars in the Large Magellanic Cloud with better resolution and sensitivity than previously possible.
G. C. Sloan, B. Aringer, Kathleen E. Kraemer, J. Cami, K. Eriksson, S. Höfner, K. Justtanont, E. Lagadec, Paola Marigo, M. Matsuura, I. McDonald, E. J. Montiel, R. Sahai, A. A. Zijlstra   +13 more
doaj   +1 more source

Infrared Spectral Energy Distribution Modeling of Velocity Excess in Maser Sources: Identifying Incipient Water Fountain Candidates

The Astrophysical Journal
We investigated whether “velocity excess” in circumstellar maser lines can diagnose the earliest evolutionary phases of water fountains (WFs). Here, we define “velocity excess” as maser emission (e.g., H _2 O 22.235 GHz or OH 1665/1667 MHz) detected at ...
Jia-Yong Xie, Jun-ichi Nakashima, Yong Zhang   +2 more
doaj   +1 more source

Searching for Imprints of Circumstellar Material in the Ultraviolet Spectra of Type Ia Supernovae [PDF]

, 2015
Type Ia supernovae (SNe Ia), having large and standard luminosities, are our primary dark energy probe. Although we believe that SNe Ia are produced by white dwarfs (WDs) in binary systems, the type of companion star is still unclear.
Foley, Ryan J., Beaudoin, Aaron T.
core  

A Theoretical Study of Carbon Nanotube Formation: Carriers of the Diffuse Interstellar Bands?

The Astrophysical Journal
Density functional theory (DFT) calculations have been conducted to probe the formation of carbon nanotubes (CNTs) from graphitic sheets in the presence of a simulated circumstellar shock wave.
A. Thakur, P. J. Lohr, J. J. Bernal, A. Asaduzzaman, K. Muralidharan, T. J. Zega, L. M. Ziurys   +6 more
doaj   +1 more source

Thermal Structure and Millimeter Emission from a Protoplanetary Disk with Embedded Protoplanets from Radiative Transfer Modeling

The Astrophysical Journal
The discovery of protoplanets and circumplanetary disks provides a unique opportunity to characterize planet formation through observations. Massive protoplanets shape the physical and chemical structure of their host circumstellar disk by accretion ...
Felipe Alarcón, Edwin A. Bergin
doaj   +1 more source

Final Moments. II. Observational Properties and Physical Modeling of Circumstellar-material-interacting Type II Supernovae

The Astrophysical Journal
We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early time ( δ t < 2 days) spectra show transient, narrow emission lines from shock ionization of confined ( r < 10 ^15 cm) circumstellar material
W. V. Jacobson-Galán, L. Dessart, K. W. Davis, C. D. Kilpatrick, R. Margutti, R. J. Foley, R. Chornock, G. Terreran, D. Hiramatsu, M. Newsome, E. Padilla Gonzalez, C. Pellegrino, D. A. Howell, A. V. Filippenko, J. P. Anderson, C. R. Angus, K. Auchettl, K. A. Bostroem, T. G. Brink, R. Cartier, D. A. Coulter, T. de Boer, M. R. Drout, N. Earl, K. Ertini, J. R. Farah, D. Farias, C. Gall, H. Gao, M. A. Gerlach, F. Guo, A. Haynie, G. Hosseinzadeh, A. L. Ibik, S. W. Jha, D. O. Jones, D. Langeroodi, N LeBaron, E. A. Magnier, A. L. Piro, S. I. Raimundo, A. Rest, S. Rest, R. Michael Rich, C. Rojas-Bravo, H. Sears, K. Taggart, V. A. Villar, R. J. Wainscoat, X-F. Wang, A. R. Wasserman, S. Yan, Y. Yang, J. Zhang, W. Zheng   +54 more
doaj   +1 more source

Observations and Radiative Transfer Simulations of the Carbon-rich AGB Star V Oph with VLTI/MATISSE

The Astrophysical Journal
Carbon-rich asymptotic giant branch (AGB) stars are among the most important contributors of enriched materials to the interstellar medium due to their strong stellar winds.
Jon Hulberg, Gioia Rau, Markus Wittkowski   +2 more
doaj   +1 more source

Observing CO in Circumstellar Disks

, 2010
This dissertation includes high-resolution, near-infrared spectroscopy to study CO in circumstellar disks around Herbig Ae/Be stars. The velocity-resolved spectra was used to measure the distribution of gas in the circumstellar disk and thus determine ...
Troutman, Matthew
core  

Dust dynamics in planet-forming discs in binary systems. [PDF]

Eur Phys J Plus, 2023
Zagaria F, Rosotti GP, Alexander RD, Clarke CJ.   +3 more
europepmc   +1 more source