Astrophys. J., 837, 122-122 (2017/March-2)
A modern search for Wolf-Rayet stars in the Magellanic Clouds. III. A third year of discoveries.
MASSEY P., NEUGENT K.F. and MORRELL N.
Abstract (from CDS):
For the past three years we have been conducting a survey for Wolf-Rayet (WR) stars in the Large and Small Magellanic Clouds (LMC, SMC). Our previous work resulted in the discovery of a new type of WR star in the LMC, which we are calling WN3/O3. These stars have the emission-line properties of a WN3 star (strong N V, but no N IV), plus the absorption-line properties of an O3 star (Balmer hydrogen plus Pickering He II, but no He I). Yet, these stars are 15 times fainter than an O3 V star, ruling out the possibility that WN3/O3s are WN3+O3 binaries. Here we report the discovery of two more members of this class, bringing the total number of these objects to 10, 6.5% of the LMC's total WR population. The optical spectra of nine of these WN3/O3s are virtually indistinguishable from each other, but one of the newly found stars is significantly different, showing a lower excitation emission and absorption spectrum (WN4/O4-ish). In addition, we have newly classified three unusual Of-type stars, including one with a strong C III λ4650 line, and two rapidly rotating "Oef" stars. We also "rediscovered" a low mass X-ray binary, RX J0513.9-6951, and demonstrate its spectral variability. Finally, we discuss the spectra of 10 low priority WR candidates that turned out to not have He II emission. These include both a Be star and a B[e] star.
© 2017. The American Astronomical Society. All rights reserved.
galaxies: individual: (LMC, SMC) - galaxies: stellar content - Local Group - stars: evolution - stars: Wolf-Rayet - stars: Wolf-Rayet
Tables 1-3: [MNM2015] LMCeNNN-N N=14 added, [MNM2015] SMCeNNN-N N=2 added.
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