Abstract
view Abstract Citations (51) References (68) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Multiwavelength Study of the Magnetically Active T Tauri Star HD 283447 Feigelson, Eric D. ; Welty, Alan D. ; Imhoff, Catherine ; Hall, Jeffrey C. ; Etzel, Paul B. ; Phillips, Robert B. ; Lonsdale, Colin J. Abstract We observed the luminous T Tauri star HD 283447 = V773 Tauri simultaneously at X-ray, ultraviolet, optical photometric and spectroscopic, and radio wavelengths for several hours on UT 1992 September 11. ROSAT, IUE, Very Large Array (VLA) and an intercontinental Very Long Baseline Interferometry (VLBI) network, and three optical observatories participated in the campaign. The star is known for its unusually high and variable nonthermal radio continuum emission. High levels of soft X-ray and Mg II line emission are discovered, with luminosity Lx = 5.5 x 1030 ergs/s (0.2 - 2 keV) and LMg II = 1 x 1029 ergs/s, respectively. Optically, the spectrum exhibits rather weak characteristics of `classical' T Tauri stars. A faint, broad emission line component, probably due to a collimated wind or infall, is present. During the campaign, the radio luminosity decreased by a factor of 4, while optical/UV lines and X-ray emission remained strong but constant. The large gyrosynchrotron-emitting regions are therefore decoupled from the chromospheric and coronal emission. Five models for the magnetic geometry around the star are discussed; solar-type activity, dipole magnetosphere, star-disk magnetic coupling, disk magnetic fields, and close binary interaction. The data suggest that two magnetic geometries are simultaneously present: complex multipolar fields like those on the Sun, and a large-scale field possibly associated with the circumstellar disk. Publication: The Astrophysical Journal Pub Date: September 1994 DOI: 10.1086/174575 Bibcode: 1994ApJ...432..373F Keywords: Emission Spectra; Light (Visible Radiation); Line Spectra; Magnesium; Radio Astronomy; Radio Spectra; Stellar Magnetic Fields; T Tauri Stars; Ultraviolet Astronomy; Ultraviolet Spectra; Visible Spectrum; X Ray Astronomy; X Ray Spectra; Astronomical Photometry; Astronomical Spectroscopy; Centimeter Waves; Iue; Rosat Mission; Superhigh Frequencies; Very Large Array (Vla); Very Long Base Interferometry; Astronomy; RADIO CONTINUUM: STARS; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HDE 283572; STARS: PRE--MAIN-SEQUENCE; ULTRAVIOLET: STARS; X-RAYS: STARS full text sources ADS | data products SIMBAD (2) MAST (1) INES (1) HEASARC (1)
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