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Coronal Structures in Cool Stars: XMM-NEWTON Hybrid Stars and Coronal EvolutionThis program addresses the evolution of stellar coronas by comparing a solar-like corona in the supergiant Beta Dra (G2 Ib-IIa) to the corona in the allegedly more evolved state of a hybrid star, alpha TrA (K2 II-III). Because the hybrid star has a massive wind, it appears likely that the corona will be cooler and less dense as the magnetic loop structures are no longer closed. By analogy with solar coronal holes, when the topology of the magnetic field is configured with open magnetic structures, both the coronal temperature and density are lower than in atmospheres dominated by closed loops. The hybrid stars assume a pivotal role in the definition of coronal evolution, atmospheric heating processes and mechanisms to drive winds of cool stars. We are attempting to determine if this model of coronal evolution is correct by using XMM-NEWTON RGS spectra for the 2 targets we were allocated through the Guest Observer program.
Document ID
20030020874
Acquisition Source
Headquarters
Document Type
Contractor or Grantee Report
Authors
Dupree, Andrea K.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Mushotzky, Richard
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
March 1, 2003
Subject Category
Astrophysics
Report/Patent Number
SAO-16613321
Funding Number(s)
CONTRACT_GRANT: NAG5-9977
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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