WR 2-1 is the first unambiguous intermediate-mass stripped star in the Milky Way: a 3-6 solar mass, 60 kK helium-rich companion in a 5.94-day binary with a rapidly rotating O-star.
The Galactic WN stars: Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation
9 Pith papers cite this work. Polarity classification is still indexing.
9
Pith papers citing it
abstract
CONTEXT: Very massive stars pass through the Wolf-Rayet (WR) stage before they finally explode. Details of their evolution have not yet been safely established, and their physics are not well understood. Their spectral analysis requires adequate model atmospheres, which have been developed step by step during the past decades and account in their recent version for line blanketing by the millions of lines from iron and iron-group elements. However, only very few WN stars have been re-analyzed by means of line-blanketed models yet. AIMS: The quantitative spectral analysis of a large sample of Galactic WN stars with the most advanced generation of model atmospheres should provide an empirical basis for various studies about the origin, evolution, and physics of the Wolf-Rayet stars and their powerful winds. METHODS: We analyze a large sample of Galactic WN stars by means of the Potsdam Wolf-Rayet (PoWR) model atmospheres, which account for iron line blanketing and clumping. The results are compared with a synthetic population, generated from the Geneva tracks for massive star evolution. RESULTS: We obtain a homogeneous set of stellar and atmospheric parameters for the Galactic WN stars, partly revising earlier results. CONCLUSIONS: Comparing the results of our spectral analyses of the Galactic WN stars with the predictions of the Geneva evolutionary calculations, we conclude that there is rough qualitative agreement. However, the quantitative discrepancies are still severe, and there is no preference for the tracks that account for the effects of rotation. It seems that the evolution of massive stars is still not satisfactorily understood.
representative citing papers
A hierarchical Bayesian fit to GWTC-5.0 constrains BBH merger efficiencies, favoring a suppression of the isolated-channel efficiency by O(10) and a dynamically-formed channel efficiency about 16 to 30 times larger than the isolated one.
Rotating massive stars with optically-thick winds produce C/O-rich ejecta that drive a fast N/O-to-normal transition, reproducing the abundance patterns of three high-z WR galaxies.
GN-z11's UV continuum and P-Cygni profiles are best explained by massive stars, and its extreme nitrogen ratio likely arises in dense gas locally enriched by Wolf-Rayet winds.
Population synthesis from binary evolution models predicts periodic neutron star-companion interactions in more than half of surviving hydrogen-poor core-collapse supernovae, with periods peaking at 20-50 days and lasting 0.5-10 years.
SPHEREx spectrophotometry confirms 13 new Galactic Wolf-Rayet stars plus 3 probable Wolf-Rayet-type planetary nebula central stars from machine-learning Gaia XP candidates.
Theoretical predictions for local BBH merger rates exceed observations by a factor >10 under conservative SFRD and metallicity assumptions, indicating need for revisions in stellar evolution.
A review article synthesizing observations, models, and supernova-progenitor relevance of Wolf-Rayet colliding wind binaries.
A review chapter maps giant, supergiant, and hypergiant luminosity classes to stellar evolutionary pathways, from massive supernova progenitors to low-mass white dwarf precursors.
citing papers explorer
-
A Galactic intermediate-mass stripped star with a Wolf-Rayet-like wind
WR 2-1 is the first unambiguous intermediate-mass stripped star in the Milky Way: a 3-6 solar mass, 60 kK helium-rich companion in a 5.94-day binary with a rapidly rotating O-star.
-
Shaping binary black hole merger efficiency with gravitational wave observations
A hierarchical Bayesian fit to GWTC-5.0 constrains BBH merger efficiencies, favoring a suppression of the isolated-channel efficiency by O(10) and a dynamically-formed channel efficiency about 16 to 30 times larger than the isolated one.
-
N/O-enhanced chemical enrichment by massive stars: the interplay of optically-thick winds and rotation
Rotating massive stars with optically-thick winds produce C/O-rich ejecta that drive a fast N/O-to-normal transition, reproducing the abundance patterns of three high-z WR galaxies.
-
Why is GN-z11 Bright, Compact, and Nitrogen Enhanced? Insights from UV Absorption and Emission Diagnostics
GN-z11's UV continuum and P-Cygni profiles are best explained by massive stars, and its extreme nitrogen ratio likely arises in dense gas locally enriched by Wolf-Rayet winds.
-
Neutron star-companion interaction in core collapse supernovae. Population synthesis based on detailed binary evolution models
Population synthesis from binary evolution models predicts periodic neutron star-companion interactions in more than half of surviving hydrogen-poor core-collapse supernovae, with periods peaking at 20-50 days and lasting 0.5-10 years.
-
Detection of new Galactic Wolf-Rayet stars with SPHEREx
SPHEREx spectrophotometry confirms 13 new Galactic Wolf-Rayet stars plus 3 probable Wolf-Rayet-type planetary nebula central stars from machine-learning Gaia XP candidates.
-
Can current models predict the local black hole merger rate?
Theoretical predictions for local BBH merger rates exceed observations by a factor >10 under conservative SFRD and metallicity assumptions, indicating need for revisions in stellar evolution.
-
Wolf-Rayet Colliding Wind Binaries
A review article synthesizing observations, models, and supernova-progenitor relevance of Wolf-Rayet colliding wind binaries.
-
Giants, Supergiants and Hypergiants
A review chapter maps giant, supergiant, and hypergiant luminosity classes to stellar evolutionary pathways, from massive supernova progenitors to low-mass white dwarf precursors.