The Gaia-ESO Survey: empirical estimates of stellar ages from lithium equivalent widths (eagles)

Autor: R D Jeffries, R J Jackson, Nicholas J Wright, G Weaver, G Gilmore, S Randich, A Bragaglia, A J Korn, R Smiljanic, K Biazzo, A R Casey, A Frasca, A Gonneau, G Guiglion, L Morbidelli, L Prisinzano, G G Sacco, G Tautvaišienė, C C Worley, S Zaggia

Publikováno v: Monthly Notices of the Royal Astronomical Society. 523:802-824

We present an empirical model of age-dependent photospheric lithium depletion, calibrated using a large, homogeneously-analysed sample of 6200 stars in 52 open clusters, with ages from 2--6000 Myr and $-0.3
Accepted for publication in Monthly No

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac8292f25723f2a5ef1f6270a822e87f
https://doi.org/10.1093/mnras/stad1293

Convection Theory and Relevant Problems in Stellar Structure, Evolution, and Pulsational Stability I Convection Theory and Structure of Convection Zone and Stellar Evolution

Autor: Da-run Xiong

Publikováno v: Frontiers in Astronomy and Space Sciences, Vol 7 (2021)

A non-local and time-dependent theory of convection was briefly described. This theory was used to calculate the structure of solar convection zones, the evolution of massive stars, lithium depletion in the atmosphere of the Sun and late-type dwarfs,

Externí odkaz: https://doaj.org/article/8436a710bd5740788532209e7c7a35d2

The VLT/SPHERE view of the ATOMIUM cool evolved star sample I. Overview: Sample characterization through polarization analysis

Autor: M. Montargès, E. Cannon, A. de Koter, T. Khouri, E. Lagadec, P. Kervella, L. Decin, I. McDonald, W. Homan, L. B. F. M. Waters, R. Sahai, C. A. Gottlieb, J. Malfait, S. Maes, B. Pimpanuwat, M. Jeste, T. Danilovich, F. De Ceuster, M. Van de Sande, D. Gobrecht, S. H. J. Wallström, K. T. Wong, I. El Mellah, J. Bolte, F. Herpin, A. M. S. Richards, A. Baudry, S. Etoka, M. D. Gray, T. J. Millar, K. M. Menten, H. S. P. Müller, J. M. C. Plane, J. Yates, A. Zijlstra

Publikováno v: Montargès, M, Cannon, E, Koter, A D, Khouri, T, Lagadec, E, Kervella, P, Decin, L, McDonald, I, Homan, W, Waters, L B F M, Sahai, R, Gottlieb, C A, Malfait, J, Maes, S, Pimpanuwat, B, Jeste, M, Danilovich, T, Ceuster, F D, Sande, M V D, Gobrecht, D, Wallström, S H J, Wong, K T, Mellah, I E, Bolte, J, Herpin, F, Richards, A M S, Baudry, A, Etoka, S, Gray, M D, Millar, T J, Menten, K M, Müller, H S P, Plane, J M C, Yates, J & Zijlstra, A 2023, ' The VLT/SPHERE view of the ATOMIUM cool evolved star sample: I. Overview: sample characterization through polarization analysis ', Astronomy and Astrophysics, vol. 671, A96 . https://doi.org/10.1051/0004-6361/202245398
Astronomy & Astrophysics, 671, pp. 1-22
Astronomy & Astrophysics, 671, 1-22

Aims. Through the ATOMIUM project, based on an ALMA large program, we aim to present a consistent view of a sample of 17 nearby cool evolved stars (Aymptotic Giant Branch and red supergiant stars). Methods. Here we present VLT/SPHERE-ZIMPOL polarimet

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4fe89cd5b1452752863127a50cb36a41
https://hdl.handle.net/2066/291694

Establishing the accuracy of asteroseismic mass and radius estimates of giant stars – II. Revised stellar masses and radii for KIC 8430105

Autor: J S Thomsen, K Brogaard, T Arentoft, D Slumstrup, M N Lund, F Grundahl, A Miglio, J Jessen-Hansen, S Frandsen

Publikováno v: Thomsen, J S, Brogaard, K, Arentoft, T, Slumstrup, D, Lund, M N, Grundahl, F, Miglio, A, Jessen-Hansen, J & Frandsen, S 2022, ' Establishing the accuracy of asteroseismic mass and radius estimates of giant stars-II. Revised stellar masses and radii for KIC 8430105 ', Monthly Notices of the Royal Astronomical Society, vol. 517, no. 3, pp. 4187-4201 . https://doi.org/10.1093/mnras/stac2942

Asteroseismic scaling relations can provide high-precision measurements of mass and radius for red giant (RG) stars displaying solar-like oscillations. Their accuracy can be validated and potentially improved using independent and accurate observatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95e7fbd96952990817a570d1f82f1545
https://doi.org/10.1093/mnras/stac2942

Evolution of dipolar mixed-mode coupling factor in red giant stars: impact of buoyancy spike

Autor: C Jiang, M Cunha, J Christensen-Dalsgaard, Q S Zhang, L Gizon

Publikováno v: Monthly Notices of the Royal Astronomical Society
Jiang, C, Cunha, M, Christensen-Dalsgaard, J, Zhang, Q S & Gizon, L 2022, ' Evolution of dipolar mixed-mode coupling factor in red giant stars : impact of buoyancy spike ', Monthly Notices of the Royal Astronomical Society, vol. 515, no. 3, pp. 3853-3866 . https://doi.org/10.1093/mnras/stac2065

Mixed modes observed in red giants allow for investigation of the stellar interior structures. One important feature in these structures is the buoyancy spike caused by the discontinuity of the chemical gradient left behind during the first dredge-up

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd7b6ee594c69b1b79f29d1f73681865
https://doi.org/10.1093/mnras/stac2065