About: Two Wolf-Rayet stars at the heart of colliding-wind binary Apep

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An Entity of Type : schema:ScholarlyArticle, within Data Space : covidontheweb.inria.fr associated with source document(s)

Attributes	Values
type	Academic Article research paper schema:ScholarlyArticle
isDefinedBy	Covid-on-the-Web dataset
has title	Two Wolf-Rayet stars at the heart of colliding-wind binary Apep
Creator	Han, Y Williams, P Callingham, J Crowther, P Marcote, B Pope, B Tuthill, P
Source	ArXiv
abstract	Infrared imaging of the colliding-wind binary Apep has revealed a spectacular dust plume with complicated internal dynamics that challenges standard colliding-wind binary physics. Such challenges can be potentially resolved if a rapidly-rotating Wolf-Rayet star is located at the heart of the system, implicating Apep as a Galactic progenitor system to long-duration gamma-ray bursts. One of the difficulties in interpreting the dynamics of Apep is that the spectral composition of the stars in the system was unclear. Here we present visual to near-infrared spectra that demonstrate that the central component of Apep is composed of two classical Wolf-Rayet stars of carbon- (WC8) and nitrogen-sequence (WN4-6b) subtypes. We argue that such an assignment represents the strongest case of a classical WR+WR binary system in the Milky Way. The terminal line-of-sight wind velocities of the WC8 and WN4-6b stars are measured to be $2100 /pm 200$ and $3500 /pm 100$ km s$^{-1}$, respectively. If the mass-loss rate of the two stars are typical for their spectral class, the momentum ratio of the colliding winds is expected to be $/approx$ 0.4. Since the expansion velocity of the dust plume is significantly smaller than either of the measured terminal velocities, we explore the suggestion that one of the Wolf-Rayet winds is anisotropic. We can recover a shock-compressed wind velocity consistent with the observed dust expansion velocity if the WC8 star produces a significantly slow equatorial wind with a velocity of $/approx$530 km s$^{-1}$. Such slow wind speeds can be driven by near-critical rotation of a Wolf-Rayet star.
has issue date	2020-05-01(xsd:dateTime)
bibo:doi	10.1093/mnras/staa1244
has license	arxiv
sha1sum (hex)	983ad6288fa838c9038e4367fa155d701aa7fb8b
schema:url	https://doi.org/10.1093/mnras/staa1244
resource representing a document's title	Two Wolf-Rayet stars at the heart of colliding-wind binary Apep
resource representing a document's body	covid:983ad6288fa838c9038e4367fa155d701aa7fb8b#body_text
is schema:about of	named entity 'speeds' named entity 'heart' named entity 'composed' named entity 'ratio' named entity 'driven' named entity 'ROTATING' named entity 'DRIVEN' named entity '921' named entity 'MASS' named entity 'SUGGESTION' named entity 'ONE OF' named entity 'RATE' named entity 'WINDS' named entity 'RECOVER' named entity 'NITROGEN' named entity 'EQUATORIAL' named entity 'CLASS' named entity 'CLASSICAL' named entity 'TYPICAL' named entity 'RESOLVED' named entity 'BINARY' named entity 'CENTRAL' named entity 'BURSTS' named entity 'STAR' covid:arg/983ad6288fa838c9038e4367fa155d701aa7fb8b named entity 'stars' named entity 'measured' named entity 'expected' named entity 'system' named entity 'explore' named entity 'The terminal' named entity 'assignment' named entity 'Wolf-Rayet stars' named entity 'classical' named entity 'dust' named entity 'stars' named entity 'plume' named entity 'consistent' named entity 'line-of-sight' named entity 'produces' named entity 'colliding-wind binary' named entity 'physics' named entity 'Wolf-Rayet star' named entity 'spectral composition' named entity 'Apep' named entity 'colliding winds' named entity 'Wolf-Rayet stars' named entity 'Apep' named entity 'velocity' named entity 'velocity' named entity 'internal' named entity 'VLBI' named entity 'near-infrared' named entity 'visible wavelengths' named entity '1.2' named entity 'kinematic' named entity 'gamma-ray burst' named entity 'weak lines' named entity '1.2' named entity 'spectral resolution' named entity 'supergiant' named entity 'WR 137' named entity 'WR stars' named entity 'terminal velocities' named entity 'stellar wind' named entity 'dust grains' named entity 'extinction' named entity 'VLBI' named entity 'sodium' named entity '5.15' named entity 'luminosities' named entity 'Apep' named entity 'kpc' named entity 'nitrogen' named entity 'P Cygni' named entity 'anisotropic' named entity 'kpc' named entity 'extinction' named entity 'distance modulus'

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