Sunspot chromospheres and their relation to the chromospheres of late main sequence stars

Details Sunspot chromospheres and their relation to the chromospheres of late main sequence stars Sunspot chromospheres and their relation to the chromospheres of late main sequence stars

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93...20m&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 20-26.

Astronomy and Astrophysics

Astrophysics

6

Chromosphere, H Lines, K Lines, Late Stars, Main Sequence Stars, Stellar Spectra, Sunspots, Emission Spectra, Line Spectra, Stellar Luminosity, Stellar Temperature

Scientific paper

The sunspot umbra parameters such as spectral type, effective temperature, and chromospheric Ca II H and K line emission are related to the same parameters of luminosity class V stars of spectral type G 8 to M 2. The sunspots follow the Wilson-Bappu relation. It is concluded that the strong magnetic fields in umbrae may control the nonradiative energy supply of the sunspot chromosphere; however, the heating mechanism is not reflected in the average appearance of the H and K line cores.

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