Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.283m&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 283-286 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
7
Flux (Rate), Iue, Late Stars, Spaceborne Astronomy, Stellar Activity, Ultraviolet Astronomy, Ultraviolet Spectra, Dynamo Theory, Gravitational Effects, Stellar Coronas
Scientific paper
The analysis of a wide sample of stars including both main-sequence and evolved stars shows that while flux-flux correlations are the same for the whole sample, the flux-period relations show a lower dependence on period for evolved stars. A gravity dependence also enters the flux-period relation for evolved stars. The flux-flux and flux-period relations are combined with coronal parameters to express Pc, Tc, and Bc in terms of the period. All increase with decreasing period, as expected if dynamo action controls activity. Specific relations between observable quantities are found which could be tested from further observations. Calculations of the convective zone fields in mildly evolved stars suggest that a larger convective zone field results which could explain the greater emission from evolved stars for a given period.
Jordan Cathy
Montesinos Benjamin
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