Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..419w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 2, p. 419-432.
Astronomy and Astrophysics
Astrophysics
28
Andromeda Galaxy, Astronomical Spectroscopy, O Stars, Spiral Galaxies, Wolf-Rayet Stars, Emission Spectra, Massive Stars, Spectral Line Width, Stellar Luminosity, Stellar Spectra, Stellar Winds
Scientific paper
Optical spectra of 11 WR stars in M 33 and M 31 obtained with a faint object spectrograph (FOS) on the 4.2 m WHT are reported. Data presented confirm that there is a wide spread in the FWHM of C IV lambda 5800 for the WC 4-5 stars in M 33 from about 30 to 110 A. The FOS data provide the first measurements of the O VI lambda 3800 region of three of the five M 33 stars. These three stars are considered to be WN-CE, WC 4-5, and WC 4 stars. These considerations limit the known WO population in M 33 to less than or equal to two objects. One M 33 star, called MCA-1-B, is found to exhibit numerous narrow emission lines in H I, He I, N II, and N III, very similar to the optical spectrum of R 84 in the LMC which provides the first indication of a transition Ofp/WN 9 star in M 33.
Schild Hans
Smith Lleweilun J.
Willis Alan J.
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