Results 81 to 90 of about 55,649 (206)
The ultraviolet extinction in M-supergiant circumstellar envelopes [PDF]
, 1986 Using International Ultraviolet (IUS) archival low-dispersion spectra, ultraviolet spectral extinctions were derived for the circumstellar envelopes of two M supergiants: HD 60414 and HD 213310.
Buss, R. H., Jr., Snow, T. P., Jr.
core
The excitation of circumstellar C
, 2013 Context. Observations of the circumstellar envelopes of post-asymptotic giant branch (post-AGB) stars provide information about their mass-loss history during the AGB phase and about the chemistry inside envelopes after that phase. Aims.
M. Pułecka +3 more
core +1 more source
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
The circumstellar envelope of IRC +10216
The Astrophysical Journal, 1977 The circumstellar envelope of IRC+10216, a late-type carbon star, is modeled, and theoretical calculations of CO, /sup 13/CO, HCN, and H/sup 13/CN emission are compared with observations. A steady mass loss from the star is assumed. The gas temperature in the flow is determined from considerations of the cooling due to free expansion and molecular ...
J. Kwan, F. Hill
openaire +1 more source
Variability in the Circumstellar Envelope of Be Stars [PDF]
Symposium - International Astronomical Union, 1994 A progress report will be given on recent studies of circumstellar variability of Be stars, their implications on the formation process, the dynamics, the structure and the morphology of the envelope. The following points are discussed: recurrence of outbursts, simultaneous infall and outflow events, variability in hot regions versus variability in the
openaire +1 more source
The abundance of SiS in circumstellar envelopes around AGB stars
, 2007 Aims.Given their photospheric origin and refractive nature, SiS molecules can provide major constraints on the relative roles of dust condensation and non-equilibrium processes in regulating the chemistry in circumstellar envelopes around evolved stars.
H. Olofsson +8 more
core +1 more source
The Astrophysical JournalRecent high-resolution observations have enabled detailed investigations of the circumstellar environments around Class 0/I protostars. Several studies have reported that the infall velocity of the envelope is a few times smaller than the freefall ...
Shingo Hirano +2 more
doaj +1 more source
Open Astronomy, 2017 Ongoing studies of different groups of stars result in improving our knowledge of their fundamental parameters and evolutionary status. Also, they result in finding new phases of stellar evolution, which require theoretical explanation. At the same time,
Miroshnichenko Anatoly S. +9 more
doaj +1 more source
Multiple Protostellar Outflows from a Single Protostar with a Misaligned Disk
The Astrophysical JournalWe investigate how misalignment between the core angular momentum and the large-scale magnetic field affects protostellar outflows, and whether a single protostellar system can drive multiple outflow components.
Shingo Hirano +2 more
doaj +1 more source
Journal of Saudi Chemical Society, 2016 The ring expansion reaction mechanisms between cyclopropenylidene and cyclic CnH2nO (n = 2, 3) compounds have been systematically investigated employing the second-order Møller-Plesset perturbation theory (MP2) method in order to better understand the ...
Xiaojun Tan, Weihua Wang, Ping Li
doaj +1 more source