Changes in Obscuration Along the Line of Sight Toward T Tau S

Details Changes in Obscuration Along the Line of Sight Toward T Tau S Changes in Obscuration Along the Line of Sight Toward T Tau S

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314703b&link_type=abstract

American Astronomical Society Meeting 203, #147.03; Bulletin of the American Astronomical Society, Vol. 36, p.592

Physics

Optics

Scientific paper

We present the results of our recent high spatial resolution imaging and spectroscopic observations of the T Tau multiple obtained with the Altair+NIRI adaptive optics system and the Michelle mid-infrared imager/spectrometer at the Gemini North Observatory. Our mid-infrared images and low resolution spectroscopy resolve the 0."7 T Tau N and S system at wavelengths from 8 to 18 microns, and our adaptive optics observations can spatially resolve the 0."1 Sa-Sb binary in the J, H and K near-infrared bands. Bound orbit models have determined that T Tau Sa is likely the most massive star in the triple, but we find that it was the faintest component in the system at all wavelengths during our observations. Our mid-infared spectra reveal that the brightness decrease of T Tau Sa was accompanied by a pronounced increase in the depth of the silicate absorption feature at 9.7 microns. Based on these data and results from our past observations, we have determined that a significant part of the infrared variability observed toward T Tau S must be caused by variations in the amount of circumstellar material along its line of sight.
Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).

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