منابع مشابه
The dust disk of HR 4049 Another brick in the Wall
We present the Spectral Energy Distribution of HR 4049 based on literature data and new continuum measurements at 850 μm. The SED shows variable absorption in the UV, and a large IR excess, both caused by circumstellar dust. The shape of the IR excess from 1 μm all the way down to 850 μm can be nearly perfectly fitted with a single blackbody function at T ≈ 1150 K or alternatively with a sum of...
متن کاملSpectral variability of the binary HR 4049 ⋆ ⋆ ⋆
The C I, Na I D, and Hα lines of the postAGB binary HR 4049 have been studied. Na I D variability results from a photospheric absorption component ([Na/H]=−1.6 ± 0.2) which follows the velocity of the primary and a stationary, non-photospheric component. An emission component is attributed to the circumbinary disc, and an absorption component to mass-loss from the system with a velocity of 5.3±...
متن کاملThe Dust and Gas Content of a Disk around the Young Star HR 4796A
We have used the James Clerk Maxwell Telescope in Hawaii to search at submillimeter wavelengths for continuum emission from dust, and spectral line emission from carbon monoxide (CO) gas, in the neighborhood of HR 4796A. This young star has a dusty disk with a central cavity, where planets may have formed. We detect the dust component at a wavelength of 850 μm, and the inferred mass of solid ma...
متن کاملVINCI - VLTI measurements of HR 4049 : the physical size of the circumbinary envelope ⋆
We present the first detection of the envelope which surrounds the post-AGB binary source HR 4049. VINCI-VLTI K-band interferometric observations of this source imply the existence of a large structure with a Gaussian angular FWHM 22.4 ± 1.4 mas or uniform disk diameter of 34.9 ± 1.9 mas. With the Hipparcos parallax of 1.50 ± 0.64 mas these values correspond to a physical size of 14.9 −7.0 AU, ...
متن کاملThe Debris Disk around Hr 8799
We have obtained a full suite of Spitzer observations to characterize the debris disk around HR 8799 and to explore how its properties are related to the recently discovered set of three massive planets orbiting the star. We distinguish three components to the debris system: (1) warm dust (T ∼ 150 K) orbiting within the innermost planet; (2) a broad zone of cold dust (T ∼ 45 K) with a sharp inn...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021478