Zobrazeno 1 - 10
of 8 699
pro vyhledávání: '"RED-GIANT STARS"'
The robustness of inferred envelope and core rotation rates of red-giant stars from asteroseismology
Rotation is an important, yet poorly-modelled phenomenon of stellar structure and evolution. Accurate estimates of internal rotation rates are therefore valuable for constraining stellar evolution models. We aim to assess the accuracy of asteroseismi
Externí odkaz:
http://arxiv.org/abs/2411.05515
Autor:
Viswanathan, Akshara, Byström, Amanda, Starkenburg, Else, Foppen, Anne, Straat, Jill, Montelius, Martin, Sestito, Federico, Venn, Kim A., Navarrete, Camila, Matsuno, Tadafumi, Martin, Nicolas F., Thomas, Guillaume F., Ardern-Arentsen, Anke, Battaglia, Giuseppina, Fouesneau, Morgan, Navarro, Julio, Vitali, Sara
Context: In the context of Galactic archaeology, the outer halo remains relatively unexplored with respect to its metallicity distribution, merger debris, and the abundance of known very/extremely metal-poor ([Fe/H]<-2.5) stars. Aim: We utilize the P
Externí odkaz:
http://arxiv.org/abs/2408.17250
Publikováno v:
A&A 690, A217 (2024)
Recent measurements of magnetic field strength inside the radiative interior of red giant stars open the way towards the characterization of the geometry of stable large-scale magnetic fields. However, current measurements do not properly constrain t
Externí odkaz:
http://arxiv.org/abs/2405.20133
Making use of the APOGEE DR17 catalogue with high quality data for 143,509 red giant branch stars we explore the strength of different mechanisms that causes a star to radially migrate in the Milky Way stellar disk. At any position in the disk we fin
Externí odkaz:
http://arxiv.org/abs/2405.19089
Autor:
Dencs, Z., Derekas, A., Mitnyan, T., Andersen, M. F., Cseh, B., Grundahl, F., Hegedűs, V., Kovács, J., Kriskovics, L., Palle, P. L., Pál, A., Szigeti, L., Mészáros, Sz.
Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to probe the farthest parts of our Galaxy. Our goal is to determine the chemical composition
Externí odkaz:
http://arxiv.org/abs/2404.13176
Autor:
Roberts, John D., Pinsonneault, Marc H., Johnson, Jennifer A., Zinn, Joel C., Weinberg, David H., Vrard, Mathieu, Tayar, Jamie, Stello, Dennis, Mosser, Benoît, Johnson, James W., Cao, Kaili, Stassun, Keivan G., Stringfellow, Guy S., Serenelli, Aldo, Mathur, Savita, Hekker, Saskia, García, Rafael A., Elsworth, Yvonne P., Corsaro, Enrico
The surface [C/N] ratios of evolved giants are strongly affected by the first dredge-up (FDU) of nuclear-processed material from stellar cores. C and N also have distinct nucleosynthetic origins and serve as diagnostics of mixing and mass loss. We us
Externí odkaz:
http://arxiv.org/abs/2403.03249
Autor:
Zhou, Jianzhao, Bi, Shaolan, Yu, Jie, Li, Yaguang, Zhang, Xianfei, Li, Tanda, Long, Liu, Li, Mengjie, Sun, Tiancheng, Ye, Lifei
Based on all 2-minute cadence $TESS$ light curves from Sector 1 to 60, we provide a catalog of 8,651 solar-like oscillators, including frequency at maximum power ($\nu_{\rm max}$, with its median precision, $\sigma$=5.39\%), large frequency separatio
Externí odkaz:
http://arxiv.org/abs/2401.11134
The age and mass of red giants are essential for understanding the structure and evolution of the Milky Way. Traditional isochrone methods for these estimations are inherently limited due to overlapping isochrones in the Hertzsprung-Russell diagram,
Externí odkaz:
http://arxiv.org/abs/2401.04900
Autor:
Vitali, S., Slumstrup, D., Jofré, P., Casamiquela, L., Korhonen, H., Blanco-Cuaresma, S., Winther, M. L., Børsen-Koch, V. Aguirre
Publikováno v:
A&A 687, A164 (2024)
Given the massive spectroscopic surveys and the Gaia mission, the Milky Way has turned into a unique laboratory to be explored using abundance ratios that show a strong dependency with time. Within this framework, the data provided through asteroseis
Externí odkaz:
http://arxiv.org/abs/2401.02328
The success of galactic archaeology and the reconstruction of the formation history of our galaxy critically relies on precise ages for large populations of stars. For evolved stars in the red clump and red giant branch, the carbon to nitrogen ratio
Externí odkaz:
http://arxiv.org/abs/2310.19872