Results 31 to 40 of about 1,072 (156)
The impact of envelope binding energies on the merger rate density of binary compact objects
Astronomy & AstrophysicsThe common envelope (CE) phase plays a key role in the formation of binary compact object systems. Its final outcome strongly depends on the envelope binding energy, but this quantity is often estimated using fitting formulas that are not fully ...
Sgalletta Cecilia +10 more
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Hot subluminous stars: Highlights from the MUCHFUSS and Kepler missions
EPJ Web of Conferences, 2013 Research into hot subdwarf stars is progressing rapidly. We present recent important discoveries. First we review the knowledge about magnetic fields in hot subdwarfs and highlight the first detection of a highly-magnetic, helium-rich sdO star.
Geier S., Heber U., Gaensicke B.
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Dynamical He Flashes in Double White Dwarf Binaries
The Astrophysical Journal, 2023 The detonation of an overlying helium layer on a 0.8–1.1 M _⊙ carbon–oxygen (CO) white dwarf (WD) can detonate the CO WD and create a thermonuclear supernova (SN).
Tin Long Sunny Wong, Lars Bildsten
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Evolution of Low-mass Population III Stars: Convection, Mass Loss, Nucleosynthesis, and Neutrinos
The Astrophysical JournalThe first stars likely formed from pristine clouds, marking a transformative epoch after the dark ages by initiating reionization and synthesising the first heavy elements.
Thiago Ferreira +3 more
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Type Ia supernova feedback effects on globular clusters of different masses
Astronomy & AstrophysicsThrough 3D hydrodynamical simulations, we explore the impact of Type Ia supernova (SN) explosions on the star formation history and chemical properties of second-generation (SG) stars in young globular clusters with masses of 105−106M⊙.
Lacchin E. +5 more
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Observations of the Ultraviolet-bright Star III-60 in the Globular Cluster NGC 6723
The Astrophysical JournalWe have analyzed archival far-ultraviolet spectra of the UV-bright star III-60 in the globular cluster NGC 6723 obtained with the Far Ultraviolet Spectroscopic Explorer and the Cosmic Origins Spectrograph. We find that the star's photospheric parameters (
William V. Dixon
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Astronomy & AstrophysicsAims. The formation mechanisms of spectrally diverse hot subdwarfs remain unclear. While existing mass distribution analyses suggest additional channels beyond helium white dwarf (He-WD) mergers contribute to He-rich subdwarf formation, these conclusions
Feng Mengqi +6 more
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A Rare Population of Intermediate-mass Helium Stars between Hot Subdwarfs and Wolf–Rayet Stars
The Astrophysical JournalHelium stars stripped of their hydrogen envelopes represent pivotal phases in binary evolution, yet their origins, particularly within the intermediate-mass range of 2–8 M _⊙ , still remain poorly understood.
Gui-Yu Wang +5 more
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He-star donor pathway for the hypervelocity star D6-2
Astronomy & AstrophysicsType Ia supernovae are thermonuclear explosions of white dwarfs, yet the nature of their progenitor systems remains uncertain. Recent discoveries of hypervelocity stars provide unique constraints, as these stars likely represent the surviving companions ...
Rajamuthukumar Abinaya Swaruba +4 more
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LTE model atmospheres for hot, helium-rich degenerate stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1990 Une nouvelle grille de modeles d'atmospheres ETL chaudes et a gravite elevee est developpee pour l'analyse des observations RX par le satellite EXOSAT d'etoiles degenerees riches en helium. Les flux emergents sont presentes pour tous les modeles calcules et l'effet de la gravite de surface et de la composition chimique sur les flux emergents est ...
openaire +1 more source