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- W2063647571 abstract "The Mg ii resonance lines in a Cygni (A2Ia) are studied from 22 spectral scans obtained by the experiment S59. The cores of the resonance lines are shifted by — 130 km/s and the short wavelength side of the core is shifted by about — 350 km/s. The lines are compared with predicted profiles in an expanding atmosphere. This comparison suggests a rate of mass loss of 3 x 10-10 ^®/year. The atmosphere seems to be accelerated up to a velocity of 300 km/s. The acceleration might be produced by the near-u.v. resonance lines of singly ionized metals. The observations of the near-u.v. spectrum of A-type supergiants with a high spectral resolution is recommended." @default.
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- W2063647571 date "1975-07-31" @default.
- W2063647571 modified "2023-09-28" @default.
- W2063647571 title "A Discussion on astronomy in the ultraviolet - Mass loss from the A-type supergiant α Cygni" @default.
- W2063647571 doi "https://doi.org/10.1098/rsta.1975.0079" @default.
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