Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..668b&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 668-680. Research supported by Harvard University;
Astronomy and Astrophysics
Astrophysics
62
Binary Stars, Chromosphere, Solar Activity, Stellar Radiation, Stellar Temperature, Ultraviolet Spectra, Cool Stars, Iue, Light (Visible Radiation), Light Curve, Mass Flow, Stellar Winds
Scientific paper
To pursue the study of solar phenomena in cool stars, chromospheric activity in Lambda Andromedae (HD 222107 has been investigated). This binary, whose primary star is G7-G8 IV-III, shows strong chromospheric emissions and is related to the RS CVn-type systems. The first quantitative measurements of chromospheric and solar-type transition-region emissions as a function of the variable starspot and active-region phenomena in an RS CVn star are presented. The presence of optically darker starspots in Lambda And coincides with the brightening of both Ca II K emission and the ultraviolet transition-region lines. The ultraviolet and optical spectra show attributes of starspots, active regions, and mass flow. Analogies to solar activity are successful in explaining these observations.
Baliunas Sallie L.
Dupree Andrea K.
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