Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...60..551f&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 60, Feb. 1986, p. 551-576. NASA-supported research.
Other
213
Chromosphere, Late Stars, Stellar Activity, Stellar Spectrophotometry, Astronomical Catalogs, Calcium, Emission Spectra, Giant Stars, H Alpha Line, Radial Velocity, Stellar Magnitude, Stellar Rotation, Ubv Spectra
Scientific paper
Photometric and/or spectroscopic observations have been obtained of 52 late-type stars which are suspected or known to be chromospherically active. Although not all types of observations were obtained for each star, these observations include all-sky BVRI Johnson photometry, ultraviolet spectrograms, low-dispersion blue-wavelength spectrograms, and high-dispersion red-wavelength spectrograms. From the spectroscopic observations v sin i's, radial velocities, and the appearance of the Ca II H and K emission lines have been determined as well as the H-alpha line. The photometric observations indicate that chromospherically active stars have V - R and V - I color excesses. Such excesses will affect the surface fluxes determined with the surface brightness-color relationship. On the other hand all-sky BVRI photometry appears to be an excellent way to identify chromospherically active stars. A small group of moderately rapidly rotating, possibly single G8-K2 giants has been found. These stars have very modest chromospheric activity and so are not FK comae stars. A number of other unusual chromospherically active stars are identified.
Fekel Francis C.
Henry Gregory W.
Moffett Thomas Joseph
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