Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994isua.conf...57n&link_type=abstract
In NASA. Marshall Space Flight Center, The Second Annual International Space University Alumni Conference p 57-65 (SEE N94-31425
Astronomy and Astrophysics
Astronomy
H Alpha Line, Infrared Astronomy, Infrared Astronomy Satellite, Protoplanets, Rosat Mission, Sky Surveys (Astronomy), Spectral Energy Distribution, Stellar Envelopes, T Tauri Stars, Temperature Profiles, Atmospheric Attenuation, Atmospheric Boundary Layer, Cosmic Dust, Emission Spectra, Far Infrared Radiation, Infrared Spectra, Near Infrared Radiation
Scientific paper
Infrared emission of circumstellar dust was observed for almost one hundred T Tauri stars. This dust is interpreted to be part of a protoplanetary disk orbiting the central star. T Tauri stars are young stellar objects and evolve into solar type stars. Planets are believed to form in these disks. The spectral energy distribution of a disk depends on its temperature profile. Different disk regions emit at different wavelengths. The disk-star boundary layer is hot and emits H(alpha) radiation. Inner disk regions at around 1 AU with a temperature of a few hundred Kelvin can be probed in near infrared wavelength regimes. Outer disk regions at around 100 AU distance from the star are colder and emit far infrared and sub-millimeter radiation. Also, X-ray emission from the stellar surface can reveal information on disk properties. Emission from the stellar surface and the boundary layer may be shielded by circumstellar gas and dust. T Tauri stars with low H(alpha) emission, i.e. no boundary layer, show stronger X-ray emission than classical T Tauri stars, because the inner disk regions of weak emission-line T Tauri stars may be clear of material. In this paper, first ROSAT all sky survey results on the X-ray emission of T Tauri stars and correlations between X-ray luminosity and properties of T Tauri disks are presented. Due to atmospheric absorption, X-ray and most infrared observations cannot be carried out on Earth, but from Earth orbiting satellites (e.g. IRAS, ROSAT, ISO) or from lunar based observatories, which would have special advantages such as a stable environment.
Neuhaeuser Ralph
Schmidt-Kaler Theodor
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