The dependence of H-alpha on chromospheric activity in G and K main-sequence stars

Details The dependence of H-alpha on chromospheric activity in G and K main-sequence stars The dependence of H-alpha on chromospheric activity in G and K main-sequence stars

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267l..61z&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 267, Apr. 1, 1983, p. L61-L63.

Astronomy and Astrophysics

Astrophysics

13

Chromosphere, G Stars, H Alpha Line, K Lines, K Stars, Main Sequence Stars, Solar Activity Effects, Stellar Spectra, Calcium, Emission Spectra, Spectral Line Width

Scientific paper

High-resolution echelle spectra have been obtained of H-alpha and Ca II K in main-sequence stars ranging from spectral type G2 to K5, including the integrated quiet sun. These stars display a variety of Ca II K emission strengths, indicative of different degrees of chromospheric activity. It is found that, among stars of similar spectral types, the central residual flux of H-alpha absorption increases with the strength of Ca II K emission. This result suggests that the H-alpha core may provide a viable diagnostic of chromospheric activity, such as the Ca II K emission has proved to be in past studies.

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