Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..110m&link_type=abstract
Astrophysical Journal, Part 1, vol. 257, June 1, 1982, p. 110-115. Research supported by the Natural Sciences and Engineering R
Other
17
Astronomical Spectroscopy, Binary Stars, Magellanic Clouds, Stellar Mass, Wolf-Rayet Stars, Absorption Spectra, B Stars, Balmer Series, Emission Spectra, Mass Ratios, O Stars, Radial Velocity, Spectral Line Width, Stellar Luminosity, Stellar Rotation
Scientific paper
Thirteen spectrograms of AB 6 were obtained during a one-week interval in December 1978 and January 1980, using the Carnegie image tube on the Yale 40 cm telescope at CTIO, Chile. The spectrum is dominated by the broad, moderately weak emission of He II A and the Balmer series absorption lines, for which radial velocities and a journal of observations are given. Moderate dispersion spectroscopy shows AB 6 to consist of a WN 3 star of about six solar masses or more in mutual 6.9 day orbit about a O7 type star of about 37 or more solar masses. The mass ratio, WR:OB, is low compared to galactic WN binaries of high ionization, although there are no binaries with WN components as hot as this known in the Galaxy. It is possible but unlikely that the low mass ratio may be caused by the inclusion of another unresolved OB star.
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