Results 51 to 60 of about 1,072 (156)
Forging Neon-distilling White Dwarfs in the Stellar Engulfments of Helium White Dwarfs
The Astrophysical JournalOnce carbon–oxygen white dwarfs cool sufficiently, they crystallize from the inside out. If the white dwarf is rich enough in ^22 Ne, these crystallized solids are buoyant and rapidly rise, efficiently liberating potential energy, which may halt the ...
Nicholas Z. Rui, Jim Fuller
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The Astrophysical JournalType Ibn supernovae (SNe Ibn) are rare stellar explosions powered primarily by interaction between the SN ejecta and H-poor, He-rich material lost by their progenitor stars.
C. Pellegrino +16 more
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The Astrophysical JournalWe present new JWST/NIRCam observations of the interacting dwarf galaxy system NGC 4485–NGC 4490 (aka Arp 269), obtained as part of the Cycle 1 Feedback in Emerging Extragalactic Star Clusters (FEAST) program. NGC 4485 and NGC 4490 form the closest known
Giacomo Bortolini +25 more
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The Astrophysical Journal Supplement SeriesWe conducted an analysis of the abundances of He, C, and N in 210 He-rich hot subdwarfs observed within both the Gaia Data Release 3 (DR3) and LAMOST DR7 data sets.
Yangping Luo +3 more
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A New Route to Massive Hot Subdwarfs: Common Envelope Ejection from Asymptotic Giant Branch Stars
The Astrophysical JournalThe hot subdwarf O/B stars (sdO/Bs) are known as extreme horizontal branch stars, which is of great importance in stellar evolution theory. The sdO/Bs are generally thought to have a helium-burning core and a thin hydrogen envelope ( M _env < 0.02 M _⊙ ).
Zhenwei Li +7 more
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Bumpy Superluminous Supernovae Powered by a Magnetar–Star Binary Engine
The Astrophysical Journal LettersWolf–Rayet stars in close binary systems can be tidally spun up by their companions, potentially leaving behind fast-spinning, highly magnetized neutron stars, known as “magnetars,” after core collapse.
Jin-Ping Zhu +6 more
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The Hα Emission of Helium-rich Stars
The Hα Emission of Helium-rich Starsapplication/pdf The circumstellar gas of helium-rich stars will be trapped in the outer region of stellar magnetosphere where the centrifugal force dominates. Only in rapidly rotating stars, the outer region can contain the gas much enough to emit the observed Hα emission energy flux.
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First stars as a possible origin for the helium-rich population in omega Centauri
, 2006 The most massive Galactic globular cluster omega Cen appears to have two, or perhaps more, distinct main sequences. Its bluest main sequence is at the centre of debate because it has been suggested to have an extremely high helium abundance of Y ~ 0.4.
Choi, Ena, Yi, Sukyoung K.
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Observations of the Ultraviolet-bright Star ZNG 1 in the Globular Cluster M5 (NGC 5904)
The Astronomical JournalWe have analyzed archival spectra of the hot UV-bright star ZNG 1 in the globular cluster M5 (NGC 5904) obtained with the Far Ultraviolet Spectroscopic Explorer and the Space Telescope Imaging Spectrograph.
William V. Dixon
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The Astrophysical JournalWe present deep Hubble Space Telescope imaging of the nearby Type Ia supernova (SN Ia) 2011fe obtained 11.5 yr after explosion. No emission is detected at the SN location to a 1 σ (3 σ ) limit of F555W > 30.2 (29.0) mag, or equivalently M _V > 1.2 (−0.1)
M. A. Tucker, B. J. Shappee
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