Results 31 to 40 of about 1,181,220 (330)
Instabilities and Solitons in Minimal Strips [PDF]
Physical Review Letters, 2016 We show that highly twisted minimal strips can undergo a nonsingular transition, unlike the singular transitions seen in the Möbius strip and the catenoid. If the strip is nonorientable, this transition is topologically frustrated, and the resulting surface contains a helicoidal defect.
Machon, Thomas J +3 more
openaire +4 more sources
Gaia-derived luminosities ofKeplerA/F stars and the pulsator fraction across the δ Scuti instability strip [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We study the fraction of stars in and around the {\delta} Scuti instability strip that are pulsating, using {\em Gaia} DR2 parallaxes to derive precise luminosities. We classify a sample of over 15,000 {\em Kepler} A and F stars into {\delta} Sct and non-
S. Murphy +3 more
semanticscholar +1 more source
Erratum: Candidates for non-pulsating stars located in the Cepheid instability strip in the Large Magellanic Cloud based on Strömgren photometry [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We present candidates for non-pulsating stars lying in the classical Cepheid instability strip based on the Optical Gravitational Lensing Experiment (OGLE) photometric maps combined with Strömgren photometry obtained with the 4.1-m Southern ...
W. Narloch +16 more
semanticscholar +1 more source
A Theoretical γ Doradus Instability Strip
The Astrophysical Journal, 2003 In this paper, we present the first theoretical γ Doradus instability strip. We find that our model instability strip agrees very well with the previously established, observationally based, instability strip of Handler & Shobbrook. We stress, as do Guzik et al., that the convection zone depth plays the major role in the determination of our ...
P. Warner, A. B. Kaye, J. Guzik
semanticscholar +2 more sources
A New Instability Strip for Hot Degenerates [PDF]
International Astronomical Union Colloquium, 1980 A completely new kind of variable star has recently been discovered (McGraw, et. al. 1979). Designated as PG1159-035 (hereafter PG) this star is distinguished not only by the complete lack of hydrogen in its spectrum but also by an effective temperature that exceeds 8 × 104 K (McGraw, private communication).
Starrfield, S. G. +2 more
openaire +2 more sources
Instability Condition Derivation for Hydraulic AGC System under Pressure Closed-Loop Control
Shock and Vibration, 2021 In strip rolling, hydraulic automatic gauge control (HAGC) system is the key element to guarantee the precision of strip gauge. The stability of the kernel pressure closed loop (PCL) in the HAGC system plays an essential role in guaranteeing the rolling ...
Yong Zhu +6 more
doaj +1 more source
Homing in on Polaris: A 7 M⊙ first-overtone Cepheid entering the instability strip for the first time [PDF]
, 2018 A recently presented HST/FGS parallax measurement of the Polaris system has been interpreted as evidence for the Cepheid Polaris Aa to be pulsating in the second overtone.
R. Anderson
semanticscholar +1 more source
Synthetic Nonlinear RR Lyrae Instability Strips [PDF]
International Astronomical Union Colloquium, 2002 AbstractA recently recognized problem is revisited, namely the discrepancy between the structure of the theoretical and the empirical, observationally derived RR Lyrae instability strips. The essence of the discrepancy is that the slope of the empirical fundamental-mode blue edge is much less steep than its theoretical counterpart.
R. Szabó +3 more
openaire +1 more source
High-resolution spectroscopy and abundance analysis of δ Scuti stars near the γ Doradus instability strip [PDF]
, 2017 $\delta$ Scuti stars are remarkable objects for asteroseismology. In spite of decades of investigations, there are still important questions about these pulsating stars to be answered, such as their positions in $\log$$T_{\rm eff}$ $-$ $\log g$ diagram ...
F. Aliçavuş +9 more
semanticscholar +1 more source
Stability Analysis of Box Tunnel Working Face under Non-Uniform Support Pressure
Applied Sciences, 2023 For rectangular section tunnel construction, soil bin pressure fluctuates under biaxial emergence conditions. Support pressure is difficult to uniformly distribute, and it can easily cause instability of the tunneling face.
Xuanyang Zhang +4 more
doaj +1 more source