Spectra of plages on the sun and stars. I - CA II H and K lines.

Details Spectra of plages on the sun and stars. I - CA II H and K lines. Spectra of plages on the sun and stars. I - CA II H and K lines.

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...62..229l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 62, Sept. 1986, p. 229-239.

Astronomy and Astrophysics

Astrophysics

23

Faculae, Solar Spectra, Stellar Activity, Stellar Magnetic Fields, Stellar Spectra, Calcium, Emission Spectra, Metallicity, Photosphere, Potassium, Stellar Gravitation, Stellar Temperature

Scientific paper

Spectra of solar plages are used to define indices of plage properties in the Ca II H and K line region. Chromospheric and photospheric emission is examined and the details of height structure are noted. It is found that: (1) all spectral lines are weakened in plages except those of H I, He I, and some ionized metals; (2) the irradiation contribution from a plage is roughly constant throughout its disk passage; and (3) plage emission distorts spectral and photometric measures of stellar gravity, metallicity, and temperature.

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