Rapid expansion of red giant stars during core helium flash by waves propagation to the envelope and implications to exoplanets

Autor: Ealeal Bear, Yarden Arad, Noam Soker, Ariel Merlov

We assume that the strong convection during core helium flash of low mass red giant branch (RBG) stars excite waves that propagate to the envelope, and find that the energy that these waves deposit in the envelope causes envelope expansion and bright

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::783415fe8fe7ed7ca4932733702e85c7
http://arxiv.org/abs/2106.00582

Asteroseismic Observations of Hot Subdwarfs

Autor: A. E. Lynas-Gray

Publikováno v: Frontiers in Astronomy and Space Sciences, Vol 8 (2021)

There are a number of reasons for studying hot subdwarf pulsation; the most obvious being that these stars remain a poorly understood late-stage of stellar evolution and knowledge of their interior structure, which pulsation studies reveal, constrain

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::052cb1e715b3a40071102e3425cdc7d2
https://doi.org/10.3389/fspas.2021.576623

Evolutionary status of W Vir pulsating variables

Autor: Yu. A. Fadeyev

Stellar evolution calculations for population II stars with initial composition $Y_0=0.25$, $Z_0=10^{-3}$ and the initial stellar mass $M_0 = 0.82M_\odot$ were carried out from the main sequence to the white dwarf stage. Twelve AGB and post--AGB evol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bfc1407fae00ec19a02f7d4b3a1f84aa

Lithium Evolution of Giant Stars Observed by LAMOST and Kepler

Autor: C. K. Li, Jianrong Shi, Jinghua Zhang, Xianfei Zhang, Hong-Liang Yan, Yaguang Li, Yan Li, Shaolan Bi, Shuai Liu, Qi Gao, Gang Zhao

Publikováno v: Zhang, J, Shi, J R, Yan, H L, Li, Y, Gao, Q, Li, C Q, Zhang, X, Liu, S, Bi, S, Zhao, G & Li, Y 2021, ' Lithium Evolution of Giant Stars Observed by LAMOST and Kepler ', Astrophysical Journal Letters, vol. 919, no. 1, L3 . https://doi.org/10.3847/2041-8213/ac224c

Mapping lithium evolution for evolved stars will provide restrictions and constraints on the fundamental stellar interior physical processes, which further shed light on our understanding of the theory of stellar structure and evolution. Based on a s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b6d9d9a1f72c62433712af47861d8bc
https://doi.org/10.3847/2041-8213/ac224c

A Red Giant Branch Common-envelope Evolution Scenario for the Exoplanet WD 1856 b

Autor: Ealeal Bear, Ariel Merlov, Noam Soker

Publikováno v: The Astrophysical Journal Letters. 915:L34

We propose a common envelope evolution (CEE) scenario where a red giant branch (RGB) star engulfs a planet during its core helium flash to explain the puzzling system WD 1856+534 where a planet orbits a white dwarf (WD) of mass 0.52Mo with an orbital

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::542321552a0dedc5b5060512d4f28150
https://doi.org/10.3847/2041-8213/ac0f7d