Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..182w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 182-190.
Astronomy and Astrophysics
Astrophysics
9
Early Stars, High Dispersion Spectrographs, O Stars, Stellar Spectrophotometry, Wolf-Rayet Stars, Emission Spectra, Iue, Line Spectra, Mass Flow Rate, Stellar Mass Ejection, Stellar Winds
Scientific paper
The Of/WN stars R 84 and S 61 of the LMC have been studied with high-dispersion spectroscopy in the optical and satellite-UV range. The high resolution and high S/N spectra in the optical range are particularly distinguished by strong emission lines of H, He I and [N II]. The comparison of R 84 with S 61 shows that the peculiar emission line spectrum is not caused by the previously found late type companion of R 84. It is found that the UV spectra of both stars closely resemble those of late O-supergiants but all absorption lines are violet-shifted. The absorption lines are stronger than in normal O-type stars. The UV-resonance lines indicate low terminal wind velocities of ≈900 km s-1 only. Unlike to normal O-type stars the Al III-resonance lines also show pronounced P Cygni profiles with an even lower edge velocity. The mass loss rates are comparable to rates found in normal luminous hot stars. It is suggested that the Of/WN transition type stars are the hotter counterparts of the early B-type P Cygni stars.
Seifert Werner
Stahl Otmar
Wolf Bernd
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