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Classical Cepheids Require Enhanced Mass Loss
Hilding R. Neilson, Norbert Langer, Scott G. Engle +2
Measurements of rates of period change of Classical Cepheids probe stellar physics and evolution. Additionally, better understanding of Cepheid structure and evolution provides gre…
X-Ray, UV and Optical Observations of Classical Cepheids: New Insights into Cepheid Evolution, and the Heating and Dynamics of Their Atmospheres
Scott G. Engle, Edward F. Guinan
To broaden the understanding of classical Cepheid structure, evolution and atmospheres, we have extended our continuing secret lives of Cepheids program by obtaining XMM/Chandra X-…
Asteroseismology of the Nearby SN-II Progenitor Rigel Part II. ε-Mechanism Triggering Gravity-Mode Pulsations?
Ehsan Moravveji, Andres Moya, Edward F. Guinan
The cores of luminous B and A-type (BA) supergiant stars are the seeds of later core collapse supernovae. Thus, constraining the near-core conditions in this class of stars can pla…
The period change of the Cepheid Polaris suggests enhanced mass loss
Hilding R. Neilson, Scott G. Engle, Ed Guinan +3
Polaris is one of the most observed stars in the night sky, with recorded observations spanning more than 200 years. From these observations, one can study the real-time evolution…
Asteroseismology of the Nearby SN-II Progenitor: Rigel Part I. The MOST High Precision Photometry and Radial Velocity Monitoring
Ehsan Moravveji, Edward F. Guinan, Matt Shultz +2
Rigel (beta Ori, B8 Ia) is a nearby blue supergiant displaying alpha Cyg type variability, and is one of the nearest type-II supernova progenitors. As such it is an excellent test…