Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...209.2921g&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #29.21
Astronomy and Astrophysics
Astronomy
Scientific paper
Observational evidence for ultra-low-amplitude (ULA) radial pulsations in Galactic yellow supergiant stars (YSGs) exists. A small survey conducted at the Missouri State University Baker Observatory has detected ULA pulsations in approximately 15% of the surveyed population of Galactic YSGs. This figure is in good agreement with statistical calculations based on large-scale surveys of the Magellanic Clouds. To date, little work has been done to explain such behavior in YSGs. Here we offer several treatments of varying difficulty and constraint with respect to physical mechanism. First, we test the mathematical viability of such behavior with an adiabatic approximation in the form of a linear adiabatic wave equation. This treatment recovers an arbitrary saturation amplitude. We then consider the physical mechanism with a linear stability analysis of the stellar equations of state. This proves the existence of continuous work integrands when summing over the entire stellar mass.
Gelven Grant
Patterson Roger
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