Relation between the (V-R) and (R-I) color indices and activity for solar-type stars

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Late Stars, Stellar Activity, Stellar Color, Stellar Spectra, Calcium, Dwarf Stars, Magnesium, Near Infrared Radiation, Subgiant Stars

Scientific paper

Bright moderately active stars with known Ca II or Mg II emission fluxes and with measured (V-R) and (R-I) color indices in the Cousins system have been checked for the presence of activity-related near-infrared excesses. With increased levels of activity, both colors show very weakly indicated excesses for subgiants and deficits for dwarfs. While the effect observed for subgiants may be related to large near-infrared excesses observed in RS CVn-type stars or other very active stars, the spectral distributions for dwarfs do not show any abnormality beyond what would be expected from the blanketing in (B-V), which was used as the reference color.

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