Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121...59f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 59-68.
Astronomy and Astrophysics
Astronomy
13
A Stars, H Lines, K Lines, Magnesium, Spaceborne Astronomy, Stellar Spectrophotometry, Ultraviolet Astronomy, Abundance, Angular Velocity, Atmospheric Models, Balloon-Borne Instruments, Chromosphere, Oao 3, Spectral Resolution, Stellar Models
Scientific paper
High resolution h (2802.7 A) and k (2795.5 A) lines Mg II obtained for the star Vega (Alpha Lyr, A0V) with Copernicus satellite and a balloon-borne ultraviolet stellar spectrometer (BUSS) are interpreted by means of theoretical NLTE line profiles in the frame work of complete (CR) and partial (PR) redistribution hypothesis. The PR profiles are remarkably coincident with the observed ones for a magnesium abundance Mg/H = 0.00001 and a projected rotation velocity v sin i = 17 km/s. LTE and NLTE atmospheric models with a temperature plateau or with temperature rises (depending on whether the atmosphere is in radiative equilibrium or not) are used to account for the possible presence of a chromosphere on Vega. The possible presence of an interstellar Mg II absorption line superimposed on the stellar ones is also discussed.
Ferrero Rubens Freire
Gouttebroze Pierre
Kondo Yoshihiko
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