Outer atmospheres of cool stars. X - HR 1099 at quadrature

Details Outer atmospheres of cool stars. X - HR 1099 at quadrature Outer atmospheres of cool stars. X - HR 1099 at quadrature

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..168a&link_type=abstract

Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p. 168-174.

Astronomy and Astrophysics

Astronomy

23

Binary Stars, Chromosphere, Cool Stars, Iue, Late Stars, Stellar Spectra, Stellar Temperature, Data Reduction, G Stars, K Stars, Radial Velocity, Spaceborne Astronomy, Stellar Rotation, Ultraviolet Spectra

Scientific paper

IUE high-dispersion, far-UV spectra of the active-chromosphere RS CVn binary HR 1099 are reported. The emission features produced by such high-temperature species as C II and C IV are found to be very bright, to exhibit structure, change significantly in the one-week interval separating the two exposures, and generally follow the radial velocity motion of the K subgiant primary, while the less massive G dwarf secondary appears only weakly in the composite spectrum. It is concluded that chromospheric and transition region emission in RS CVn binaries is a stellar rather than system phenomenon, and the structure evident in some of the emission line shapes is interpreted as a patchy brightness distribution on and above the K star surface that is spread out in velocity by the rapid rotation.

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