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Nonthermal Radio Emission and the HR DiagramPerhaps the most reliable indicator of non-radiative heating/momentum in a stellar atmosphere is the presence of nonthermal radio emission. To date, 77 normal stellar objects have been detected and identified as nonthermal sources. These stellar objects are tabulated herein. It is apparent that non-thermal radio emission is not ubiquitous across the HR diagram. This is clearly the case for the single stars; it is not as clear for the binaries unless the radio emission is associated with their late-type components. Choosing to make this association, the single stars and the late-type components are plotted together. The following picture emerges: (1) there are four locations on the HR diagram where non-thermal radio stars are found; (2) the peak incoherent 5 GHz luminosities show a suprisingly small range for stars within each class; (3) the fraction of stellar energy that escapes as radio emission can be estimated by comparing the integrated maximum radio luminosity to the bolometric luminosity; (4) there are no apparent differences in L sub R between binaries with two cool components, binaries with one hot and one cool component, and single stars for classes C and D; and (5) The late-type stars (classes B, C, and D) are located in parts of the HR diagram where there is reason to suspect that the surfaces of the stars are being braked with respect to their interiors.
Document ID
19850009454
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gibson, D. M.
(New Mexico Inst. of Mining and Technology)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: NASA. Goddard Space Flight Center The Origin of Nonradiative Heating(Momentum in Hot Stars
Subject Category
Space Radiation
Accession Number
85N17763
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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