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Photoelectric measures of chromospheric H and K and H-epsilon in giant stars
Wilson, O. C.
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA)
Astrophysical Journal, Part 1, vol. 257, June 1, 1982, p. 179-192. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Chromosphere, Electrophotometry, Giant Stars, H Lines, K Lines, Late Stars, Radiant Flux Density, Calcium, Emission Spectra, Energy Transfer, M Stars, Main Sequence Stars, Star Clusters, Stellar Spectrophotometry, Telescopes
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The coude scanner of the 100-inch telescope was used to measure the fluxes at the centers of H and K of Ca II and at the position of H-epsilon, and its antiposition, in about 200 late-type giant stars. For the large majority of class III giants, it was found that the total chromospheric radiation of H and K and of H-epsilon is constant in amount for G8 to early M-type stars with respect to the energy in the V band, and that the two Ca II lines together emit about three times as much energy as does H-epsilon. In the Hyades main sequence the efficiency of the transfer of energy from the total outflow into the chromosphere increases from the bluer to the redder stars, whereas the converse is true in the normal giants. Evidence is given that main-sequence stars with H and K emission also have emission in H-epsilon that is considerably weaker, with respect to H and K, than in the giants.

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