A study of the dependence of MG II emission on the rotational periods of main-sequence stars

Details A study of the dependence of MG II emission on the rotational periods of main-sequence stars A study of the dependence of MG II emission on the rotational periods of main-sequence stars

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..778h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 778-784.

Astronomy and Astrophysics

Astrophysics

79

Dwarf Stars, Late Stars, Main Sequence Stars, Stellar Rotation, Stellar Spectra, Calcium, Chromosphere, F Stars, G Stars, Iue, K Stars, Magnesium, Metallic Stars, Ultraviolet Spectra

Scientific paper

International Ultraviolet Explorer satellite measurements of the Mg II chromospheric emission from a sample of late-type dwarfs with known rotational periods are presented. The ratio of chromospheric to photospheric luminosity for the late-G and K type stars in this sample can be fitted within the probable errors by a single function of rotational period. The chromospheric emission of early-G and F dwarfs appears to depend upon rotation in a qualitatively different way, which suggests that the rapid variation of convective zone properties in this spectral range affects the dissipation of energy in the chromosphere. Mg II h and k emission correlates fairly well with Ca II emission. However, the data sample is not large enough at present to show conclusively that Mg II emission exhibits precisely the same dependence on rotation and spectral type as the Ca II H and K line fluxes.

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