Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..445w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 445-457.
Other
39
Absorption Spectra, Helium, Line Spectra, Stellar Spectra, Wolf-Rayet Stars, Carbon, Early Stars, Spectrum Analysis, Ultraviolet Spectra
Scientific paper
New 2-micron spectra of eight Wolf-Rayet stars are presented, showing He I 2s1S-2p 1P(0) absorption lines displaced by velocities of about 0.7 of the terminal velocities derived conventionally. It is argued that these lines are formed in the outermost regions of the winds and give more accurate representations of the terminal velocities than do the violet edges of the P Cygni profiles of C IV observed in the UV. Consequently, mass loss rates derived for these stars using the C IV profiles must be reduced in proportion. From the similarity of their displacement velocities to those of the He I lines, it is suggested that the narrow Fe III absorption lines observed in WC 9 stars are also formed in the asymptotic region and are neither related to the NACs seen in other luminous early-type stars nor formed in distant wind deceleration zones.
Eenens Philippe R. J.
Williams Peredur M.
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