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Titolo:
Diffraction-limited speckle-masking interferometry of the red supergiant VY CMa
Autore:
Wittkowski, M; Langer, N; Weigelt, G;
Indirizzi:
Max Planck Inst Radioastron, D-53121 Bonn, Germany Max Planck Inst Radioastron Bonn Germany D-53121 , D-53121 Bonn, Germany Univ Potsdam, Inst Phys, D-14415 Potsdam, Germany Univ Potsdam Potsdam Germany D-14415 Inst Phys, D-14415 Potsdam, Germany
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 2, volume: 340, anno: 1998,
pagine: L39 - L42
SICI:
0004-6361(199812)340:2<L39:DSIOTR>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
LATE-TYPE STARS; MASS-LOSS RATES; H-R DIAGRAM; EVOLVED STARS; HYPERGIANT IRC+10420; COOL HYPERGIANT; CANIS-MAJORIS; EMISSION; RESOLUTION; EVOLUTION;
Keywords:
techniques : interferometric; stars : supergiants; stars : late-type; stars : mass-loss; stars : individual : VY CMa;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Wittkowski, M Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, GermanyMax Planck Inst Radioastron Hugel 69 Bonn Germany D-53121 y
Citazione:
M. Wittkowski et al., "Diffraction-limited speckle-masking interferometry of the red supergiant VY CMa", ASTRON ASTR, 340(2), 1998, pp. L39-L42

Abstract

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 similar to 0.8 mu m (RG 780 filter), 1.28 mu m, and 2.17 mu m the diffraction-limited resolutions of 46 mas, 73 mas, and 124 mas were achieved. All images clearly show that the circumstellar envelope of VY CMa is non-spherical. The RG 780, 1.28 mu m, and 2.17mu m FWHM Gauss fit diameters are 67 mas x 83 mas, 80 mas x 116 mas and 138 mas x 205 mas, respectively, or 100 AU x 125 AU, 120 AU x 174 AU and 207 AU x 308 AU (for a distance of 1500 pc). We discuss several interpretationsfor the asymmetric morphology. Combining recent results about the angular momentum evolution of red supergiants and their pulsational properties, we suggest that VY CMa is an immediate progenitor of IRC +10 420, a post red supergiant during its transformation into a Wolf-Rayet star.

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Documento generato il 05/12/20 alle ore 23:57:42