Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...133...57m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 133, no. 1, April 1984, p. 57-62. Research supported by the Ministero della Pu
Astronomy and Astrophysics
Astrophysics
34
Chromosphere, Late Stars, Main Sequence Stars, Stellar Coronas, Stellar Radiation, Stellar Rotation, Data Reduction, K Lines, Ultraviolet Spectra, X Rays
Scientific paper
Data from ground and space observations (IUE and Einstein Observatories) of Ca2, C4, UV and X-ray emission from late main sequence stars F7-M2 are discussed. The relation between rotation and emission in the chromospheres, transition regions, and coronae is examined and compared to relations derived from previous measurements. It is shown that the Lk, L4 and Lx emission luminosities of main stars decrease exponentially when the rotational period increases, regardless of the spectral type of the stars. Coefficients in the correlation are found to be in good agreement with observed power-law relations between C4 and X-ray emission and chromospheric emission. The effect of rotation period on dynamo-generated magnetic field is briefly discussed.
Catalano Santo
Marilli Ettore
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