Results 131 to 140 of about 1,537 (221)

Locating extrema on the potential energy surface of a reacting system methyl and fluorenyl via quantum chemical methods

Вестник Самарского университета: Естественнонаучная серия
The study of aromatic and resonance-stabilized radicals reaction mechanisms has a key importance for understanding the processes of molecular mass growth of polycyclic aromatic hydrocarbons (PAHs) and carbon nanoparticles in various astrophysical ...
V. S. Krasnoukhov, P. S. Pivovarov, V. N. Azyazov   +2 more
doaj   +1 more source

Circumstellar rings, flat and flaring discs

, 2006
3 pages ; to appear in the proceedings of the Sapporo meeting on active OB stars ; ASP Conference Series ; eds: S. Stefl, S. Owocki and A. OkazakiEmission lines formed in the circumstellar envelopes of several type of stars can be modeled using first ...
Arias, M.L., Frémat, Y., Zorec, J.
core  

Millimeter-wavelength spectral line surveys of evolved circumstellar envelopes

, 2013
Evolved stars including asymptotic giant branch stars, proto-planetary nebulae and planetary nebulae are well known to be sources of molecules for the interstellar medium.
Chau, Wayne C, 周穎鏘
core   +1 more source

Investigating Asymmetry Development from SiO to H2O Maser Regions in VX Sagittarii

The Astronomical Journal
Simultaneous very-long-baseline interferometry monitoring observations of H _2 O and SiO masers toward VX Sagittarii were conducted from 2014 February to 2019 January.
Dong-Hwan Yoon, Se-Hyung Cho, Youngjoo Yun, Haneul Yang, Jaeheon Kim   +4 more
doaj   +1 more source

EP Aquarii: A New Picture of the Circumstellar Envelope

Research in Astronomy and Astrophysics
Abstract New analyses of earlier ALMA observations of oxygen-rich AGB star EP Aquarii are presented, which complete a previously published analysis and offer a different interpretation of the morpho-kinematics of the circumstellar envelope.
Pham T. Nhung, Do T. Hoai, Pierre Darriulat, Pham Tuan-Anh, Pham N. Diep, Nguyen B. Ngoc, Tran T. Thai   +6 more
openaire   +2 more sources

The abundance of HCN in circumstellar envelopes of AGB stars of different chemical type

, 2013
Aims. A multi-transition survey of HCN (sub-) millimeter line emission from a large sample of asymptotic giant branch (AGB) stars of different chemical type is presented. The data are analysed and circumstellar HCN abundances are estimated.
H. Olofsson, Lindqvist, Michael, Bieging, J. H.,, Olofsson, Hans, F. L. Schöier, Olofsson, H., Ramstedt, Sofia,, Schöier, Fredrik, Sch\uf6ier, Fredrik, Ramstedt, S., Bieging, J. H., Schöier, Fredrik,, M. Lindqvist, Olofsson, Hans,, Marvel, K. B.,, K. B. Marvel, S. Ramstedt, J. H. Bieging, Marvel, K. B., Lindqvist, Michael,, Ramstedt, S.,, Lindqvist, M.   +21 more
core   +1 more source

The Protostars in Orion: Characterizing the Properties of Their Magnetized Envelopes

The Astrophysical Journal
We present a study connecting the physical properties of protostellar envelopes to the morphology of the envelope-scale magnetic field. We used the Atacama Large Millimeter/submillimeter Array (ALMA) polarization observations of 61 young protostars at 0 ...
Bo Huang, Josep M. Girart, Ian W. Stephens, Manuel Fernández López, Philip C. Myers, Qizhou Zhang, John J. Tobin, Paulo Cortes, Nadia M. Murillo, Sarah Sadavoy, Hector G. Arce, John M. Carpenter, Woojin Kwon, Valentin J. M. Le Gouellec, Zhi-Yun Li, Leslie W. Looney, Tom Megeath, Erin G. Cox, Nicole Karnath, Dominique Segura-Cox   +19 more
doaj   +1 more source

Polarization and SEDs From Microlensing of Circumstellar Envelopes

, 2008
Microlensing surveys have proven to be tremendously fruitful in providing valuable data products for many fields of astrophysics, from eclipse lightcurves for substellar candidates to limb darkening in stellar atmospheres.
Bunker, Christina, Bjorkman, Jon E., Ignace, Richard   +2 more
core  

The mystery of unidentified infrared emission bands. [PDF]

Astrophys Space Sci, 2022
Kwok S.
europepmc   +1 more source

Gas-phase preparation of azulene (C₁₀H₈) and naphthalene (C₁₀H₈) via the reaction of the resonantly stabilized fulvenallenyl and propargyl radicals. [PDF]

Chem Sci, 2023
Li W, Yang J, Zhao L, Couch D, Marchi MS, Hansen N, Morozov AN, Mebel AM, Kaiser RI.   +8 more
europepmc   +1 more source