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Planetary influence on a stellar convective shell can result in a periodic modulation of stellar dynamo drivers. Similar modulation can arise in stellar binary systems. Using the Parker low-mode dynamo model we investigate the properties of nonlinear parametric resonance. This model is a system of four ordinary differential equations and, in the first approximation, describes the processes of generation and oscillation of large-scale magnetic fields in stellar systems. In the absence of nonlinear suppression effects, the problem, by analogy with a system of harmonic oscillations, allows an asymptotic selection of multiple resonant frequencies. Despite the fact that at first glance at these frequencies it is reasonable to expect an increase in the amplitude, the behavior of the system can be just the opposite. All this stuff deserves a systematic analysis of swing excitation in the dynamo sistems in comparison with classical swing excitation in the framework of the Mathieu equation.
An accurate description of the center-to-limb variation (CLV) of stellar spectra is becoming an increasingly critical factor in both stellar and exoplanet characterization. In particular, the CLV of spectral lines is extremely challenging as its characterization requires highly detailed knowledge of the stellar physical conditions. To this end, we present the Numerical Empirical Sun-as-a-Star Integrator (NESSI) as a tool for translating high-resolution solar observations of a partial field of view into disk-integrated spectra that can be used to test common assumptions in stellar physics.
In the early 1990s the two fragments of black stone making up the Tower of Babylon stele with pictures of the ziggurat in Babylon and the king Nebuchadnezzar II were found in the large open trench from the German excavations of Amran in 1900. The findspot was about 20 m north of the Esagil temple in Babylon, but the level where it was discovered is not Neo-Babylonian but later, possibly Parthian. The archaeological and historical background of the stele is discussed, and the image of the Ziggurat on the stele is considered. After 28 years in the Schøyen Collection Oslo, the stele is now in the Iraq Museum in Baghdad.
Our students ought to know about the history of formal hospital segregation and desegregation. To that end, this article urges those who teach foundational health law and policy courses to do three things. First, to teach the Simkins case. Second, to swap out the usual Medicare signing ceremony picture for one that includes W. Montague Cobb, M.D., Ph.D. Third, to highlight how the implementation of that program for the elderly led, in a matter of months, to the desegregation of hospitals throughout the country.