Bispectrum speckle interferometry observations and radiative transfer modelling of the red supergiant NML Cyg
نویسندگان
چکیده
منابع مشابه
ASTRONOMY AND ASTROPHYSICS Diffraction - limited Speckle - Masking Interferometry of the Red Supergiant VY CMa ⋆
We present the first diffraction-limited images of the mass-loss envelope of the red supergiant star VY CMa. The two-dimensional optical and NIR images were reconstructed from 3.6 m telescope speckle data using bispectrum speckle interferometry. At the wavelengths ∼ 0.8 µm (RG 780 filter), 1.28 µm, and 2.17 µm the diffraction-limited resolutions of 46 mas, 73 mas, and 124 mas were achieved. All...
متن کاملDiffraction-limited speckle-masking interferometry of the red supergiant VY CMa
We present the first diffraction-limited images of the mass-loss envelope of the red supergiant star VY CMa. The twodimensional optical and NIR images were reconstructed from 3.6 m telescope speckle data using bispectrum speckle interferometry. At the wavelengths ∼ 0.8 μm (RG 780 filter), 1.28 μm, and 2.17 μm the diffraction-limited resolutions of 46 mas, 73 mas, and 124 mas were achieved. All ...
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The hypergiant IRC +10 420 is a unique object for the study of stellar evolution since it is the only object that is believed to be witnessed in its rapid transition from the red supergiant stage to the Wolf-Rayet phase. Its effective temperature has increased by 1000–2000 K within only 20 yr. We present the first speckle observations of IRC +10 420 with 73 mas resolution. A diffraction-limited...
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We present the results of bispectrum speckle interferometry of the B[e] star MWC 349A obtained with the SAO 6m telescope. Our diffraction-limited J-, H-, and K-band images (resolutions 43–74 mas) suggest the star is surrounded by a circumstellar disk seen almost edge-on. The observed visibility shape is consistent with a two-component elliptical disk model, probably corresponding to the gaseous...
متن کاملThe ISO-SWS spectrum of NML Cyg
The high resolution spectrum of NML Cyg observed with the ISO-SWS in its slow-speed grating mode (2.4-45 m) shows a wealth of features never seen before in previous observations. These include ro-vibrational lines of H2O at 2.7 and 6.2 m, of OH between 3 and 3.5 m and a deep absorption band of CO2 at 4.26 m. We also report on the detection of pure rotational emission lines of H2O between 35 and...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20010095