Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..185b&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 185-18
Astronomy and Astrophysics
Astrophysics
3
Eclipsing Binary Stars, Stellar Atmospheres, Stellar Structure, Interstellar Extinction, Iue, Stellar Spectra, Ultraviolet Spectra
Scientific paper
IUE ultraviolet investigations of the eclipsing binary FF Aquarii (G8 III+sdOB, P = 9d.2) reveal intense and extreme chromospheric activity in the cool star. The giant star's ultraviolet spectrum can be observed during total eclipse of the subdwarf. IUE spectra obtained during ingress and egress of the total eclipse show that some absorption lines in the subdwarf spectrum, for example, C II and C IV are doubled in strength relative to quadrature. This excess absorption is likely caused by a geometrically extended atmosphere of the G8 III star and the enhancements are present at least to 1.5 stellar radii above the surface of the G8 III star. Since the enhancements have persisted for three years, they cannot be transient phenomena.
Baliunas Sallie L.
Dorren David J.
Guinan Edward F.
Loesser J. G.
Raymond John C.
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