scholarly journals R-mode Stability of GW190814's Secondary Component as a Supermassive and Superfast Pulsar

2021 ◽  
Vol 910 (1) ◽  
pp. 62
Author(s):  
Xia Zhou ◽  
Ang Li ◽  
Bao-An Li
Keyword(s):  
Secondary Component ◽  
Mode Stability

scholarly journals Non-Adiabatic Seismic Study of The Thin Convective Envelope of δ Scuti Stars

2004 ◽  
Vol 193 ◽  
pp. 470-473
Author(s):  
M.-A. Dupret ◽  
A. Grigahcène ◽  
R. Garrido ◽  
J. Montalban ◽  
M. Gabriel ◽  
...  
Keyword(s):  
Instability Strip ◽  
Full Spectrum ◽  
Convective Envelope ◽  
Theoretical Predictions ◽  
Mode Stability ◽  
Different Color ◽  
Mixing Length Theory ◽  
Scuti Stars ◽  
Δ Scuti Stars ◽  
Phase Differences

AbstractFor δ Sct stars, the theoretical predictions of a non-adiabatic pulsation code are very dependent on the characteristics of the thin convective envelope of the models (Balona & Evers 1999). The treatment of the non-adiabatic interaction between convection and pulsation also has a significant impact on the results, particularly near the red edge of the instability strip. The non-adiabatic theoretical predictions can be tested upon observations by comparing them to the amplitude ratios and phase differences as observed in different color passbands (Dupret et al. 2003). In the first part of this paper, we compare the results obtained by adopting different treatments of convection in the interior and atmosphere models: mixing-length theory (MLT) and full spectrum of turbulence (FST) (Canuto et al. 1996, CGM). In the second part, we examine the problem of the interaction between convection and pulsation and compare the mode stability obtained with and without including time-dependent convection in our non-adiabatic code.

Gravity darkening of the secondary component of Algol

1970 ◽  
Vol 9 (3) ◽  
pp. 343-352 ◽  
Author(s):  
Edwin Budding ◽  
Zden?k Kopal
Keyword(s):  
Secondary Component

Effect of poloidal equilibrium flow and pressure gradient on the m/n = 2/1 tearing mode

2022 ◽  
Author(s):  
Yue Ming ◽  
Deng Zhou ◽  
Jinfang Wang
Keyword(s):  
Pressure Gradient ◽  
Stability Index ◽  
Plasma Pressure ◽  
Mode Number ◽  
Pressure Perturbation ◽  
Equilibrium Flow ◽  
Tearing Mode ◽  
Mode Instability ◽  
Mode Stability ◽  
Adverse Influence

Abstract The effect of equilibrium poloidal flow and pressure gradient on the m/n = 2/1 (m is the poloidal mode number and n is the toroidal mode number) tearing mode instability for tokamak plasmas is investigated. Based on the condition of ≠0 ( is plasma pressure), the radial part of motion equation is derived and approximately solved for large poloidal mode numbers (m). By solving partial differential equation (Whittaker equation) containing second order singularity, the tearing mode stability index Δ′ is obtained. It is shown that, the effect of equilibrium poloidal flow and pressure gradient has the adverse effect on the tearing mode instability when the pressure gradient is nonzero. The poloidal equilibrium flow with pressure perturbation partially reduces the stability of the classical tearing mode. But the larger pressure gradient in a certain poloidal flow velocity range can abate the adverse influence of equilibrium poloidal flow and pressure gradient. The numerical results do also indicate that the derivative of pressure gradient has a significant influence on the determination of instability region of the poloidal flow with pressure perturbation.

Influence of ridge geometry on lateral mode stability of (In/Al)GaN laser diodes

2005 ◽  
Vol 202 (2) ◽  
pp. 173-173 ◽  
Author(s):  
Ulrich T. Schwarz ◽  
Markus Pindl ◽  
Evi Sturm ◽  
Michael Furitsch ◽  
Andreas Leber ◽  
...  
Keyword(s):  
Laser Diodes ◽  
Mode Stability ◽  
Lateral Mode ◽  
Ridge Geometry

scholarly journals Measurement of the Resistive-Wall-Mode Stability in a Rotating Plasma Using Active MHD Spectroscopy

2004 ◽  
Vol 93 (13) ◽  
Author(s):  
H. Reimerdes ◽  
M. S. Chu ◽  
A. M. Garofalo ◽  
G. L. Jackson ◽  
R. J. La Haye ◽  
...  
Keyword(s):  
Resistive Wall Mode ◽  
Mode Stability ◽  
Resistive Wall

scholarly journals CHROMOSPHERIC ACTIVITY NATURE OF KIC 6044064

2021 ◽  
Vol 57 (2) ◽  
pp. 351-361
Author(s):  
E. Yoldaş
Keyword(s):  
Primary Component ◽  
Secondary Component ◽  
Migration Period ◽  
Chromospheric Activity ◽  
Spot Group ◽  
Kepler Mission ◽  
Phase Interval

This study presents results obtained from the data of KIC 6044064 (KOI 6652). KIC 6044064 was observed by the Kepler Mission for a total of 1384.254 days. 525 minima times were determined, 264 of which were primary minima and the rest were secondary minima. The OPEA model was derived and its parameters were obtained. On the secondary component, there are two different spot bands latitudinally outstretched, consisting of three spots located with a phase interval of 0.33. The average migration period was found to be 623.063±4.870 days (1.71±0.01 years) for the first spot group, while it was 1125.514±7.305 days (3.08±0.02 years) for the second group. The spectral types of the components seem to be G7V+K9V. Their masses and radii were determined to be 0.86Mʘ and 0.89Rʘ for the primary component and 0.54Mʘ and 0.62Rʘ for the secondary component.

scholarly journals Equilibrium and ballooning mode stability of an axisymmetric tensor pressure tokamak

1980 ◽  
Author(s):  
W.A. Cooper ◽  
G. Bateman ◽  
D.B. Nelson ◽  
T. Kammash
Keyword(s):  
Ballooning Mode ◽  
Mode Stability

scholarly journals The Radio Jet of Quasar 0153+744

1998 ◽  
Vol 164 ◽  
pp. 61-62
Author(s):  
C.A. Hummel
Keyword(s):  
Short Length ◽  
Secondary Component ◽  
Relativistic Beaming ◽  
Relativistic Jet

AbstractWe highlight a few aspects of the radio jet of quasar 0153+744. Some challenge the relativistic beaming model to explain a stationary jet of short length and ending in a bright secondary component, extreme bending of the jet, and the lack of any emission on the counter jet side. We discuss a model of a precessing mildly relativistic jet for 0153+744.

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