Magnetic structure in cool stars. V - Chromospheric and transition-region emission from giants

Details Magnetic structure in cool stars. V - Chromospheric and transition-region emission from giants Magnetic structure in cool stars. V - Chromospheric and transition-region emission from giants

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110...30o&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 1, June 1982, p. 30-36. Research supported by the Nederlandse Organisatie voor Zuiver

Astronomy and Astrophysics

Astrophysics

46

Chromosphere, Cool Stars, Giant Stars, Spectral Emission, Stellar Coronas, Stellar Magnetic Fields, Stellar Temperature, Binary Stars, Iue, K Stars, Late Stars, Stellar Spectra, Ultraviolet Spectra

Scientific paper

The outer atmospheres of giants at larger heights than the low chromosphere, where the Ca II H and K lines are formed, are studied. In particular, the coupling between the upper chromosphere and the transition region is investigated. G and early K-type giants of different Ca II H and K line-core flux were selected for observations with the IUE. The transition-region flux, defined as the sum of fluxes in the lines of Si IV, C IV, and N V are plotted against the chromospheric flux, defined as the sum of the fluxes in lines of O I and Si II. A surprisingly tight relation is found between transition-region and chromospheric flux which extends over two orders of magnitude in the chromospheric flux and three orders in the transition-region flux. This relation holds for all stars in the sample, including giants, main-sequence stars, and close binaries. The results are discussed in terms of discrete solar-like magnetic structure.

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