Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..261b&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 2, July 1978, p. 261-265.
Astronomy and Astrophysics
Astrophysics
24
Binary Stars, Magellanic Clouds, Stellar Spectrophotometry, Wolf-Rayet Stars, Companion Stars, Hot Stars, Nebulae, Radial Velocity, Star Clusters, Stellar Luminosity, Stellar Spectra
Scientific paper
Preliminary results are reported for a spectroscopic study of four Wolf-Rayet stars in the Small Magellanic Cloud (Sanduleak 41, 78, 108, and 188). Echelle spectrograms covering the wavelength range from 3700 to 5500 A are examined which were obtained with a dispersion of 124 A/mm in the blue. Intensity tracings and radial-velocity measurements are discussed along with the spectral features observed and the spectral classification of each star. It is found that all four of these Wolf-Rayet stars in the SMC are associated with nebulae and show direct or indirect evidence of having an O-type stellar companion. The WR component is classified as WN3 for both Sk 78 and 108, while the companions are estimated to have absolute magnitudes of -7.6 and -6.9, respectively. Sk 41 is classified as WN4.5. It is suggested that Sk 188 may be in a stage of nebula production and that the development of the nebula has not yet been completed.
Breysacher Jacques
Westerlund Bengt E.
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