Absolute flux calibration of the H and K lines of CA II - Chromospheric radiative losses in F and G-type stars

Astronomy and Astrophysics – Astrophysics

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F Stars, G Stars, Giant Stars, H Lines, K Lines, Line Spectra, Stellar Spectra, Calcium, Chromosphere, Stellar Luminosity, Stellar Rotation

Scientific paper

Ca II H and K spectra of 81 (mainly Southern) F and G stars are analyzed using two different calibration methods. It is shown that, for spectra of sufficiently high resolution, and for stars of relatively low rotation rates, the calibrations of Linsky et al. (1979) and of Pasquini et al. (1988) give essentially the same results. These calibrations are used to derive absolute surface fluxes in the H and K lines of Ca II for 64 stars. It is shown that several late-F and early-G giants and supergiants have Ca II H and K fluxes in excess of about 10 to the 6th erg/sq cm s, much larger than those typically observed for normal giants of later spectral types.

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