Benchmarking mesa isochrones against the Hyades single star sequence
Электронный научный архив УРФУ
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| Заглавие |
Benchmarking mesa isochrones against the Hyades single star sequence
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| Автор |
Brandner, W.
Calissendorff, P. Kopytova, T. |
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| Тематика |
CONVECTION
HERTZSPRUNG-RUSSELL AND COLOUR-MAGNITUDE DIAGRAMS OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: HYADES STARS: EVOLUTION STARS: FUNDAMENTAL PARAMETERS STARS: INTERIORS GIANT STARS COLOR-MAGNITUDE DIAGRAMS COLOUR-MAGNITUDE DIAGRAMS CONVECTION HERTZSPRUNG-RUSSELL HERTZSPRUNG-RUSSELL AND COLOR-MAGNITUDE DIAGRAM OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: HYADES STAR: EVOLUTION STARS: INTERIORS STARS:FUNDAMENTAL PARAMETERS STELLARS GEOMETRICAL OPTICS |
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| Описание |
Based on GAIA Early Data Release 3 (EDR3), we revisit and update our sample of bonafide single stars in the Hyades open cluster. The small observational uncertainties in parallax and photometry of EDR3 result in a tightly defined stellar sequence, which is ideal for the testing and calibration of theoretical stellar evolutionary tracks and isochrones. We benchmark the solar-scaled mesa evolutionary models against the single star sequence. We find that the non-rotating mesa models for [Fe/H] = +0.25 provide a good fit for stars with masses above 0.85, and very low mass stars below 0.25 M⊙. For stars with masses between 0.25 and 0.85 M⊙, the models systematically under predict the observed stellar luminosity. One potential limitation of the models for partially convective stars more massive than 0.35 M⊙ is the prescription of (superadiabatic) convection with the mixing-length theory parameter αML tuned to match the Solar model. Below 0.35 M⊙, the increased scatter in the stellar sequence might be a manifestation of the convective kissing instability, which is driven by variations in the 3He nuclear energy production rate due to instabilities at the convective core to envelope boundary. For a Hyades-like stellar population, the application of solar-scaled models to subsolar mass stars could result in a significant underestimate of the age, or an overestimate of the metallicity. We suggest that future grids of solar-scaled evolutionary stellar models could be complemented by Hyades-scaled models in the mass range 0.25 to 0.85 M⊙. © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
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| Дата |
2024-04-05T16:32:26Z
2024-04-05T16:32:26Z 2022 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Brandner, W, Calissendorff, P & Kopytova, T 2022, 'Benchmarking mesa isochrones against the Hyades single star sequence', Monthly Notices of the Royal Astronomical Society, vol. 518, no. 1, pp. 662-668. https://doi.org/10.1093/mnras/stac2247
Brandner, W., Calissendorff, P., & Kopytova, T. (2022). Benchmarking mesa isochrones against the Hyades single star sequence. Monthly Notices of the Royal Astronomical Society, 518(1), 662-668. https://doi.org/10.1093/mnras/stac2247 0035-8711 Final All Open Access, Hybrid Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85146561678&doi=10.1093%2fmnras%2fstac2247&partnerID=40&md5=ce00f188614d2c1a7e6cd69f7cbcc609 https://academic.oup.com/mnras/article-pdf/518/1/662/47534679/stac2247.pdf http://elar.urfu.ru/handle/10995/130770 10.1093/mnras/stac2247 85146561678 000893171500001 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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application/pdf
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Oxford University Press
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| Источник |
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society |
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