ar X iv : a st ro - p h / 06 03 27 4 v 2 1 8 M ar 2 00 6 Properties of the δ Scorpii Circumstellar Disk from Continuum Modeling
نویسندگان
چکیده
We present optical WBVR and infrared JHKL photometric observations of the Be binary system δ Sco, obtained in 2000–2005, mid-infrared (10 and 18 μm) photometry and optical (λλ 3200–10500 Å) spectropolarimetry obtained in 2001. Our optical photometry confirms the results of much more frequent visual monitoring of δ Sco. In 2005, we detected a significant decrease in the object’s brightness, both in optical and near-infrared brightness, which is associated with a continuous rise in the hydrogen line strenghts. We discuss possible causes for this phenomenon, which is difficult to explain in view of current models of Be star disks. The 2001 spectral energy distribution and polarization are succesfully modeled with a three-dimensional non-LTE Monte Carlo code which Instituto de Astronomia, Geof́isica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, São Paulo, SP, 05508–900, Brazil Department of Physics and Astronomy, University of North Carolina at Greensboro, P.O. Box 26170, Greensboro, NC 27402–6170, USA Ritter Observatory, Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606– 3390, USA Sternberg Astronomical Institute, Universitetskij pr. 13, Moscow, Russia Fesenkov Astrophysical Institute, Kamenskoe plato, Almaty 480068, Kazakhstan South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa European Space Astronomy Centre, Research and Scientific Support Department of ESA, Villafranca del Castillo, Apartado de Correos 50727, E–28080 Madrid, Spain European Space Astronomy Centre, Villafranca del Castillo, Apartado de Correos 50727, E–28080 Madrid, Spain Observatorio Astronómico, Universidad de Valencia, 46100 Burjassot, Spain
منابع مشابه
ar X iv : a st ro - p h / 06 03 27 4 v 1 1 0 M ar 2 00 6 Properties of the δ Scorpii Circumstellar Disk from Continuum Modeling
We present optical WBVR and infrared JHKL photometric observations of the Be binary system δ Sco, obtained in 2000–2005, mid-infrared (10 and 18 μm) photometry and optical (λλ 3200–10500 Å) spectropolarimetry obtained in 2001. Our optical photometry confirms the results of much more frequent visual monitoring of δ Sco. In 2005, we detected a significant decrease in the object’s brightness, both...
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