Wolf-Rayet
Metallicity Dependent Wolf-Rayet Winds
... At solar metallicity, single star models predict that the core is spun down either during the red supergiant (via a magnetic dynamo) or Wolf-Rayet (via mass-loss) phases. The tendency of GRBs to originate ...
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A survey of the Wolf-Rayet population of the barred, spiral galaxy NGC 1313
... Wolf–Rayet (WR) stars are evolved, He-burning stars that are de- scended from the most massive O stars. They have a profound influ- ence on their surroundings since intense stellar winds continually ...
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Spitzer Space Telescope Infrared Spectrograph (IRS) spectroscopy of the prototype Wolf-Rayet star EZ Canis Majoris (HD 50896)
... prototype Wolf- Rayet star EZ CMa (HD 50896 = WR 6 in the catalog of van der Hucht 2001) has been studied extensively at nearly all wavelengths accessible with ground-based facilities and space ...
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The Wolf-Rayet population of the nearby barred spiral galaxy NGC 5068 uncovered by the Very Large Telescope and Gemini
... Massive stars (>8 M ) dominate the radiative ionizing budget of star-forming galaxies, and contribute significantly to the mechanical energy budget via their powerful stellar winds and ultimate death as core-collapse ...
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Spectral models for binary products: Unifying subdwarfs and Wolf-Rayet stars as a sequence of stripped-envelope stars
... Stripped stars are thought to be very hot objects, emitting the majority of their photons in the extreme ultraviolet (Götberg et al. 2017). This, in combination with the prediction that they form frequently and are ...
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Properties of hot stars in the Wolf-Rayet galaxy NGC5253 from ISO-SWS spectroscopy
... Guest Observer programme. NGC 5253 contains several very young super-star clusters, no older than a few million years (Walsh & Roy 1989; Beck et al. 1996). It has been the focus of many recent studies (e.g. Gorjian ...
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Investigating the origin of the spectral line profiles of the Hot Wolf-Rayet Star WR 2
... Classical Wolf-Rayet (WR) stars are the chemically evolved descendants of O stars, possessing a unique spectroscopic signature of strong, broad emission lines, arising within their fast, dense winds ...
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IC 4663: the first unambiguous [WN] Wolf-Rayet central star of a planetary nebula
... massive Wolf–Rayet (WR) stars and they are classified into either [WO] or [WC] types, the brackets distinguishing them apart from massive stars (van der Hucht 2001), depending on which emission lines are ...
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Uncovering multiple Wolf-Rayet star clusters and the ionized ISM in Mrk 178: the closest metal-poor Wolf-Rayet H ii galaxy
... metal-poor Wolf– Rayet (WR) galaxy Mrk 178 to examine the spatial correlation between its WR stars and the neighbouring ionized interstellar medium ...
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How extreme are the Wolf-Rayet clusters in NGC 3125?
... We reinvestigate the massive stellar content of the irregular dwarf galaxy NGC 3125 (Tol 3) us- ing Very Large Telescope (VLT)/FORS1 imaging and spectroscopy, plus archival VLT/ISAAC, Hubble Space Telescope (HST)/FOC and ...
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A study of variability in the ultraviolet spectra of galactic Wolf-Rayet stars
... of Wolf-Rayet (W R) stars, there are so m any features th a t it is often difficult to distinguish a continuum level and m any of the observed features do not have a secure ...
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Anisotropic winds in a Wolf-Rayet binary identify a potential gamma-ray burst progenitor
... As discussed in the main body, our toy geometrical model for the Apep plume, presented in Figure 4, results from a spiral with a full opening angle of 120◦ implying a nearly-equal moment[r] ...
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Quantitative studies of Wolf-Rayet stars in Local Group galaxies
... Up until recently th e com pactness of th e central ionizing cluster, HD 97950, and large in terstellar extinction tow ards N G C3603 prevented detailed studies of its stellar con te n t. H ofm ann, Seggewiss & ...
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Hydrogen in the atmosphere of the evolved WN3 Wolf-Rayet star WR 3: defying an evolutionary paradigm?
... If WR 3 is indeed a single WN3 star, then the presence of relatively strong absorption lines in the optical spectrum points to relatively high hydrogen content.. This leads us to classif[r] ...
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Cool Wolf-Rayet central stars and their planetary nebulae
... Table 6.1 lists various observational results for our program m e stars, which are taken m ostly from C hapter 5. Observed visual magnitudes are taken from our spectropho to m etry which are within 0.1 mag of near-sim ...
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Do Wolf Rayet stars have similar locations in hosts as type Ib/c supernovae and long gamma ray bursts?
... If the fractional fluxes are measured in the original images, considerably higher values are obtained and the WR distributions become skewed towards brighter pixels, even brighter than f[r] ...
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Model atmosphere studies of Wolf-Rayet stars
... In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted.. Copyright of the Dissertation is held by the Au[r] ...
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Spatial distribution of Galactic Wolf–Rayet stars and implications for the global population
... Apparently single WN stars and those with an insignificant companion contribution at IR wavelengths of known distance used to calibrate near-IR absolute magnitudes by spectral type.. New[r] ...
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Narrow band photometry of Wolf-Rayet stars
... 3 The emission lines of the Of star in the spectroscopic binary, 29 Can Maj, indicate a mean velocity which is 66 km/sec greater than that obtained from the absorption lines originating [r] ...
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Howling about wolf control in Minnesota
... Dick Lecocq, the president-elect of the MSCA, asserts that the depredation problem is far worse than what is perceived.49 He believes based on the number of cattle missing from his herd and the loss of aborted calves ...
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