Magnetic structure in cool stars. VIII - The MG II H and K surface fluxes in relation to the Mt. Wilson photometric CA II H and K measurements

Details Magnetic structure in cool stars. VIII - The MG II H and K surface fluxes in relation to the Mt. Wilson photometric CA II H and K measurements Magnetic structure in cool stars. VIII - The MG II H and K surface fluxes in relation to the Mt. Wilson photometric CA II H and K measurements

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147..265o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 2, June 1985, p. 265-272. Research supported by the Stichting Astrono

Astronomy and Astrophysics

Astrophysics

28

Chromosphere, Cool Stars, H Lines, K Lines, Stellar Magnetic Fields, Stellar Spectra, Calcium, Giant Stars, Iue, K Stars, Late Stars, Main Sequence Stars, Subgiant Stars, Supergiant Stars

Scientific paper

Data from IUE observations of 14 F, G, and K stars of luminosity II-V in the Mg II h + k lines are presented in tables and compared with published Mt. Wilson photometry of the Ca II H + K lines, and empirical relations are derived to facilitate the use of Ca II H + K data in investigating the chromospheric structure of cool stars. The results are presented in graphs, and consideration is given to the Vaughan-Preston gap for main-sequence stars; the (B-V)-dependent flux minima for main-sequence (LC V) stars, LC IV subgiants, and LC III giants (consistent with a dynamo model with magnetic braking and tidal synchronization); the very large fluxes of FK Com stars; and the positions of the LC II bright giants and LC I supergiants on the chromospheric-flux/color diagram.

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