Results 41 to 50 of about 1,072 (156)

The Asteroseismological Richness of RCB and dLHdC Stars

The Astrophysical Journal
RCB stars are L ≈ 10 ^4 L _⊙ solar-mass objects that can exhibit large periods of extinction from dust ejection episodes. Many exhibit semi-regular pulsations in the range of 30–50 days with semi-amplitudes of 0.05–0.3 mag.
Tin Long Sunny Wong, Lars Bildsten
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A comprehensive grid of massive binary evolution models for the Galaxy: Surface properties of post-mass-transfer stars

Astronomy & Astrophysics
Context. Massive stars often evolve in binary systems, and the interactions of these systems significantly affect their evolution. Massive stars in the Galaxy serve as valuable test beds for such interactions due to their proximity. Aims. We computed the
Jin Harim, Langer Norbert, Ercolino Andrea, de Mink Selma E.   +3 more
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The Impact of Breathing Pulses during Core Helium Burning on the Core Chemical Structure and Pulsations of Hydrogen-rich Atmosphere White Dwarfs

The Astrophysical Journal
Breathing pulses are mixing episodes that could develop during the core helium-burning phase of low- and intermediate-mass stars. The occurrence of breathing pulses is expected to bear consequences on the formation and evolution of white dwarfs ...
Alejandro H. Córsico, Leandro G. Althaus   +1 more
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Adiabatic Mass Loss in Binary Stars. IV. Low- and Intermediate-mass Helium Binary Stars

The Astrophysical Journal Supplement Series
The unstable mass transfer situation in binary systems will asymptotically cause the adiabatic expansion of the donor star and finally lead to the common envelope phase.
Lifu Zhang, Hongwei Ge, Xuefei Chen, Zhanwen Han   +3 more
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Type Ib supernovae are bluer than Type Ic supernovae

Astronomy & Astrophysics
Type Ib and Ic supernovae (SNe Ib/Ic) are the bright finale of massive stars that have lost their hydrogen envelopes, making them powerful probes of mass stripping in massive star evolution.
Jin Harim, de Mink Selma E., Holzner Sebastian, Klencki Jakub, Csörnyei Géza, Yoon Sung-Chul, Arcavi Iair, Kerzendorf Wolfgang E.   +7 more
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Detection of Enhanced Germanium in a New Cool Extreme Helium Star A980: Insights and Implications

The Astrophysical Journal
A fine abundance analysis of a recently discovered hydrogen-deficient carbon (HdC) star, A980, is presented. Based on the observed high-resolution optical spectrum, we ascertain that A980 is a cool extreme helium (EHe) star and not an HdC star.
Ajay Kumar Saini, Gajendra Pandey
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A joint JWST and HST view of Omega Centauri: Multiple stellar populations and their kinematics

Astronomy & Astrophysics
We combine F115W and F277W images collected with the Near Infrared Camera of the James Webb Space Telescope with multiband, multi-epoch Hubble Space Telescope observations of ω Centauri to investigate its multiple stellar populations and internal ...
Ziliotto T., Milone A. P., Cordoni G., Marino A. F., Legnardi M. V., Dondoglio E., Bortolan E., Muratore F.   +7 more
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ε-mechanism driven pulsations in hot subdwarf stars with mixed H-He atmospheres

Open Astronomy, 2017
The ε mechanism is a self-excitation mechanism of stellar pulsations which acts in regions where nuclear burning takes place. It has been shown that the ε mechanism can excite pulsations in hot pre-horizontal branch stars before they settle into the ...
Battich Tiara, Bertolami Marcelo M. Miller, Córsico Alejandro H., Althaus Leandro G.   +3 more
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The Stripped-star Ultraviolet Magellanic Cloud Survey (SUMS): The Ultraviolet Photometric Catalog and Stripped-star Candidate Selection

The Astrophysical Journal
Most massive stars (∼8–25 M _⊙ ) interact with a binary companion during their lifetimes. These interactions can remove the hydrogen-rich envelope, producing intermediate-mass (∼2–8 M _⊙ ) and helium-rich stars.
B. Ludwig, M. R. Drout, Y. Götberg, D. Lang, A. Laroche   +4 more
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Nuclear reactions in AGB nucleosynthesis: the 19F(α, p)22Ne at energies of astrophysical relevance

EPJ Web of Conferences, 2017
The abundance of 19F in the universe is strictly related to standard and extra-mixing processes taking place inside AGB-stars, that are considered to be the most important sites for its production.
D’Agata G., Pizzone R. G., La Cognata M., Indelicato I., Spitaleri C., Blagus S., Cherubini S., Figuera P., Grassi L., Guardo G. L., Gulino M., Hayakawa S., Kshetri R., Lamia L., Lattuada M., Mijatović T., Milin M., Miljanić Ð., Prepolec L., Rapisarda G. G., Romano S., Sergi M. L., Soić N., Tokić V., Tumino A., Uroić M.   +25 more
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