The active chromosphere binary HD 17433 (VY Arietis)
1989; IOP Publishing; Volume: 339; Linguagem: Inglês
10.1086/167360
ISSN1538-4357
AutoresB. W. Bopp, Steven H. Saar, C. W. Ambruster, P. A. Feldman, Robert C. Dempsey, Morgan Allen, Samuel C. Barden,
Tópico(s)Astro and Planetary Science
Resumoview Abstract Citations (52) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Active Chromosphere Binary HD 17433 (VY Arietis) Bopp, Bernard W. ; Saar, Steven H. ; Ambruster, Carol ; Feldman, Paul ; Dempsey, Robert ; Allen, Morgan ; Barden, Samuel C. Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1989 DOI: 10.1086/167360 Bibcode: 1989ApJ...339.1059B Keywords: 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; Astrophysics; STARS: BINARIES; STARS: CHROMOSPHERES; STARS: EMISSION-LINE; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 17433; STARS: INDIVIDUAL CONSTELLATION NAME: VY ARIETIS; STARS: MAGNETIC; STARS: PRE--MAIN-SEQUENCE full text sources ADS | data products SIMBAD (7) MAST (1) INES (1)
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