Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339.1059b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 1059-1072.
Astronomy and Astrophysics
Astrophysics
46
Binary Stars, Chromosphere, K Stars, Magnetic Stars, Pre-Main Sequence Stars, Stellar Activity, Emission Spectra, H Alpha Line, Line Spectra, Lithium, Magnetic Flux, Radial Velocity, Stellar Orbits, Ultraviolet Spectra
Scientific paper
The sixth-magnitude K star HD 17433 (VY Ari) is shown to be an active-chromosphere binary with an orbital period of 13.198 days. A photometric (rotational) period of 17.4 days is indicated by the existing photometry, implying that HD 17433 is not in synchronous rotation. In the optical, H-alpha is seen in emission, with variable profile and intensity; He I lambda-5876 is present in absorption. IUE observations show chromospheric and transition-region emission lines with surface fluxes up to 200 times greater than those observed in the quiet sun. The luminosity and radius are appropriate for a subgiant, and the kinematics suggest Pleiades group membership. The presence of a lithium absorption feature indicates it may either be a young object, possibly a pre-main sequence star or an evolved spotted RS CVn system. Interpretations from the optical measurement of the magnetic field strength of HD 17433 are given.
Allen Morgan
Ambruster Carol
Barden Samuel C.
Bopp Bernard William
Dempsey Robert
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