Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..432s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 432-448.
Astronomy and Astrophysics
Astrophysics
32
Chromosphere, Cool Stars, Late Stars, Stellar Activity, Stellar Coronas, X Ray Sources, Exosat Satellite, Iue, Main Sequence Stars, Metal Ions
Scientific paper
The flux-flux relationships of cool stars are studied on the basis of nearly simultaneous measurements of Ca II H+K, Mg II h+k, and soft X-ray fluxes. A linear relationship is derived between IUE Mg II h+k fluxes and Mount Wilson Ca II H+K fluxes which were obtained within 36 hr of each other for a sample of 26 F5-K3 main-sequence stars. Nearly simultaneous EXOSAT soft X-ray fluxes are compared with Ca II H+K fluxes for a sample of 20 dwarfs and gaints with spectral types ranging from F6 to K2, and 72 additional cool stars for which noncontemporaneous Ca II H+K and EINSTEIN soft X-ray fluxes are available are compared. It is confirmed that a nonradiatively heated chromosphere exists on even the least active main-sequence stars. This basal chromosphere is probably independent of stellar magnetic activity.
Dobson Andrea K.
Radick Richard R.
Schrijver Carolus J.
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