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A survey of chromospherically active stars

1986; Institute of Physics; Volume: 60; Linguagem: Inglês

10.1086/191097

1538-4365

Francis C. Fekel, T. J. Moffett, Gregory W. Henry,

History and Developments in Astronomy

view Abstract Citations (248) References (112) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Survey of Chromospherically Active Stars Fekel, F. C. ; Moffett, T. J. ; Henry, G. W. Abstract 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. Publication: The Astrophysical Journal Supplement Series Pub Date: February 1986 DOI: 10.1086/191097 Bibcode: 1986ApJS...60..551F Keywords: 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; Astronomy; CA II EMISSION; STARS: CHROMOSPHERES; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 9746; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 17144; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 27536; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 31993; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 34198; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 203251; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (51) MAST (1)