Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..101d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 1, Nov. 1985, p. 101-106.
Astronomy and Astrophysics
Astrophysics
14
B Stars, Stellar Mass Ejection, Stellar Spectrophotometry, Stellar Temperature, Stellar Winds, Ultraviolet Spectra, Abundance, Balmer Series, Metallicity, Stellar Envelopes, Stellar Models
Scientific paper
Ultraviolet observations of the B/e/ star HD 87643 have revealed the presence of a wind in low ionization species with outflow velocities of up to 800 km/s in the Mg II doublet. The dominating species in the spectrum are the once-ionized metals, mostly Fe II. The P Cyg profiles of the Mg II lines have a structure similar to that of the Balmer lines. The behavior of the Fe II lines is complex, with profiles ranging from an almost pure emission to an almost pure absorption. P Cyg profiles are represented in the first UV multiplets. The observed properties of the Fe II lines can be explained in terms of a resonance fluorescence mechanism plus optical depth effects in an expanding medium. The mass-loss rate derived after a detailed evaluation of the ionization equilibrium throughout the envelope is about 10 to the -7th solar mass per year. A semiqualitative model for the outer layers, consisting of four different regions, is proposed.
de Freitas Pacheco José Antonio
Faria Lopes D.
Landaberry S. C.
Selvelli Pier Luigi
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