Results 31 to 40 of about 308,331 (322)

Accretion variability of Herbig Ae/Be stars observed by X-Shooter. HD 31648 and HD 163296 [PDF]

, 2013
This work presents X-Shooter/VLT spectra of the prototypical, isolated Herbig Ae stars HD 31648 (MWC 480) and HD 163296 over five epochs separated by timescales ranging from days to months.
Brittain, S. D., Eiroa, C., Meeus, G., Mendigutía, I., Montesinos, B., Mora, A., Muzerolle, J., Oudmaijer, R. D., Rigliaco, E.   +8 more
core   +4 more sources

UV excess measures of accretion onto young very low-mass stars and brown dwarfs [PDF]

, 2008
Low-resolution spectra from 3000-9000 AA of young low-mass stars and brown dwarfs were obtained with LRIS on Keck I. The excess UV and optical emission arising in the Balmer and Paschen continua yields mass accretion rates ranging from 2e-12 to 1e-8 Mo ...
Baraffe I., Gregory J. Herczeg, Kurosawa R., Leinert C., Lynne A. Hillenbrand, Mauas P. J. D., Rucinski S. M., Schaefer G. H., Short C. I.   +8 more
core   +2 more sources

TERRAIN TECTONICS OF THE CENTRAL ASIAN FOLDED BELT

Геодинамика и тектонофизика, 2015
The terrain analysis concept envisages primarily a possibility of approximation of fragments / terrains of various geodynamic settings which belong to different plates. The terrain analysis can supplement the theory of plate tectonics in solving problems
M. M. Buslov
doaj   +1 more source

Chemical Evolution in VeLLOs [PDF]

, 2007
A new type of object called "Very Low Luminosity Objects (VeLLOs)" has been discovered by the Spitzer Space Telescope. VeLLOs might be substellar objects forming by accretion.
Lee, Jeong-Eun
core   +2 more sources

On the accretion flow geometry in A0535+26 [PDF]

, 2001
The geometry of accretion flow in the Be/X-ray transient A0535+26 is explored. It is shown that neither moderate nor giant X-ray flaring events observed in the system can be interpreted within the spherically symmetrical accretion model and hence the ...
Alpar, Anzer, Arons, Clark, Clark, Clark, Coe, Dal Fiume, de Loore, Eggleton, Elsner, Finger, Ghosh, Giovannelli, Haigh, Hanuschik, Ikhsanov, Kanno, Lamb, Lamers, Lee, Matsuda, Motch, N. G. Beskrovnaya, N. R. Ikhsanov, Negueruela, Okazaki, Porter, Rosenberg, Shakura, Taam, V. M. Larionov, van der Klis   +32 more
core   +2 more sources

Spectral and Temporal Properties of CXOUJ122956.7+075728 (ULX-1), an Ultraluminous X-Ray Source in NGC 4472

East European Journal of Physics
This report presents a comprehensive analysis of the spectral and temporal characteristics of a highly significant Ultraluminous X-ray Source (ULX) designated as CXOUJ122956.7+075728 (ULX-1) situated in the elliptical galaxy NGC 4472 within the Virgo ...
A. Senorita Devi
doaj   +1 more source

Self-Similar Solution of Hot Accretion Flow with Anisotropic Pressure

Universe, 2019
For the accretion flow in extremely low-luminosity active galactic nuclei, such as our Galactic center (Sgr A*) and M 87, the collisional mean-free path of ions may be much larger than its gyroradius.
De-Fu Bu, Pei-Yao Xu, Bo-Cheng Zhu
doaj   +1 more source

The Three Dimensional Structure of EUV Accretion Regions in AM Herculis Stars: Modeling of EUV Photometric and Spectroscopic Observations [PDF]

, 1998
We have developed a model of the high-energy accretion region for magnetic cataclysmic variables and applied it to {\it Extreme Ultraviolet Explorer} observations of 10 AM Herculis type systems.
Bailey J., Bailey J., Beuermann K., Cameron A. G. W., Cropper M. S., Ferrario L., Imamura J. N., King A. R., Kuijpers J., Martin M. Sirk, Mason K. O., Meggitt S. M. A., Ramsay G., Ramsay G., Rosen S. R., Schwope A. D., Schwope A. D., Schwope A. D., Schwope A. D., Steve B. Howell, Stockman H. S., Wickramasinghe D. T., Wickramasinghe D. T., Woelk U., Wu K.   +24 more
core   +3 more sources

Hot Accretion Flow in Two-Dimensional Spherical Coordinates: Considering Pressure Anisotropy and Magnetic Field

Universe, 2019
For systems with extremely low accretion rate, such as Galactic Center Sgr A* and M87 galaxy, the ion collisional mean free path can be considerably larger than its Larmor radius. In this case, the gas pressure is anisotropic to magnetic field lines.
Hui-Hong Deng, De-Fu Bu
doaj   +1 more source

A New Parameter In Accretion Disk Model

, 2000
Taking optically thin accretion flows as an example, we investigate the dynamics and the emergent spectra of accretion flows with different outer boundary conditions (OBCs) and find that OBC plays an important role in accretion disk model.
AF Illarionov, E Quataert, F Yuan, F Yuan, IV Igumenshchev, JF Lu, LS Sparke, MA Abramowicz, MA Abramowicz, NI Shakura, R Coker, R Matsumoto, R Narayan, R Narayan, R Narayan, X Chen, X Chen   +16 more
core   +1 more source