Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432..373f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 1, p. 373-385
Astronomy and Astrophysics
Astronomy
44
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
Scientific paper
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.
Etzel Paul B.
Feigelson Eric D.
Hall Jeffrey Clifton
Imhoff Catherine
Lonsdale Colin J.
No associations
LandOfFree
Multiwavelength study of the magnetically active T Tauri star HD 283447 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multiwavelength study of the magnetically active T Tauri star HD 283447, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiwavelength study of the magnetically active T Tauri star HD 283447 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1787871