Excess calcium emission flux and the Rossby number

Details Excess calcium emission flux and the Rossby number Excess calcium emission flux and the Rossby number

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..273s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 273-278. Research supported by Polska Akademia Nau

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23

Calcium, Cool Stars, Emission Spectra, Main Sequence Stars, Rossby Regimes, Chromosphere, Computational Astrophysics, Dwarf Stars, Stellar Color, Stellar Rotation, Stellar Temperature

Scientific paper

It is demonstrated that the excess calcium flux listed by Rutten (1987) for many main sequence stars with known or inferred rotation period correlates well with the Rossby number. Empirically determined turnover times agree within the accuracy of determination with theoretical values for B-V of less than 0.8 but for B-V of greater than 0.8 a constant value of the turnover time equal to 20.5 + or - 1.0 days is obtained. A single relation connecting the excess calcium emission flux and stellar parameters for main sequence stars of different spectral types and rotation rates is empirically obtained and compared with a similar relation for the relative net calcium emission flux obtained by Noyes et al. (1984). The consequences of both formulas for the heating theory of stellar chromospheres by mechanical waves are briefly discussed.

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