This document appears to be a citation to a solar physics paper published in 1990, but does not provide any other contextual information. It lists the same citation five times without any other text.
This document summarizes different instability regions in the upper Hertzsprung–Russell diagram for blueward evolving supergiants. It outlines three areas: 1) Where stars are dynamically unstable based on their generalized adiabatic exponent values. 2) Where the effective acceleration in the upper photosphere is negative. 3) Where the sonic point of stellar winds is inside the photosphere. It compares these results to actual star positions and finds evidence recent changes in a yellow hypergiant were due to negative effective acceleration. Instabilities in another star may relate to these three factors coinciding.
This document appears to be a citation to a 1992 astronomy and astrophysics journal article with a volume number of 264 and page number 147, as it is repeated multiple times without any other contextual information provided. The document itself does not contain much substantive content to summarize beyond the bibliographic citation information.
This document appears to be a citation to a solar physics paper published in 1990, but does not provide any other contextual information. It lists the same citation five times without any other text.
This document summarizes different instability regions in the upper Hertzsprung–Russell diagram for blueward evolving supergiants. It outlines three areas: 1) Where stars are dynamically unstable based on their generalized adiabatic exponent values. 2) Where the effective acceleration in the upper photosphere is negative. 3) Where the sonic point of stellar winds is inside the photosphere. It compares these results to actual star positions and finds evidence recent changes in a yellow hypergiant were due to negative effective acceleration. Instabilities in another star may relate to these three factors coinciding.
This document appears to be a citation to a 1992 astronomy and astrophysics journal article with a volume number of 264 and page number 147, as it is repeated multiple times without any other contextual information provided. The document itself does not contain much substantive content to summarize beyond the bibliographic citation information.