Mass loss from the A-type supergiant alpha Cygni

Details Mass loss from the A-type supergiant alpha Cygni Mass loss from the A-type supergiant alpha Cygni

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.279..445l&link_type=abstract

(Royal Society, Discussion on Astronomy in the Ultraviolet, London, England, Apr. 9, 10, 1974.) Royal Society (London), Philosop

Astronomy and Astrophysics

Astronomy

12

A Stars, Atmospheric Models, Line Spectra, Stellar Atmospheres, Stellar Mass Ejection, Supergiant Stars, Frequency Shift, Magnesium, Mass Transfer, Resonance, Spectrum Analysis, Stellar Spectra

Scientific paper

Twenty-two spectral scans by the Orbiting Stellar Spectrometer S-59 are used to analyze the Mg II resonance lines at 2795.5 and 2802.7 A in alpha Cyg (Deneb). The cores of these lines are found to be shifted toward the shorter wavelengths by -130 km/s, while the shorter-wavelength side of the cores is shifted by about -350 km/s. The lines are compared with theoretical profiles based on an expanding model atmosphere, and a mass-loss rate is estimated. It is shown that the atmosphere may be accelerated up to a velocity of 300 km/s, which is probably due to the near-UV resonance lines of singly ionized metals.

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