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Models of metal-poo...
Models of metal-poor stars with different initial abundances of C, N, O, Mg, and Si - I. Bolometric corrections derived from new MARCS synthetic spectra and their implications for observed colour-magnitude diagrams
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- VandenBerg, Don A. (författare)
- Univ Victoria, Dept Phys & Astron, STN CSC, POB 1700, Victoria, BC V8W 2Y2, Canada.
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- Edvardsson, Bengt, Associate Professor, 1956- (författare)
- Uppsala universitet,Teoretisk astrofysik
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- Casagrande, Luca (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Canberra, ACT 2611, Australia.
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- Ferguson, Jason W. (författare)
- Wichita State Univ, Dept Phys, Wichita, KS 67260 USA.
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Univ Victoria, Dept Phys & Astron, STN CSC, POB 1700, Victoria, BC V8W 2Y2, Canada Teoretisk astrofysik (creator_code:org_t)
- 2021-10-21
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 509:3, s. 4189-4207
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- New, high-resolution MARCS synthetic spectra have been calculated for more than a dozen mixtures of the metals allowing, in turn, for variations in C:N:O, [CNO/Fe], and enhanced abundances of C, O, Mg, and Si. Bolometric corrections (BCs) for many of the broad-band filters currently in use have been generated from these spectra. Due to improved treatments of molecules that involve atoms of C, N, and O, the BCs for UV and blue passbands, in particular, differ substantially from those derived from previous MARCS models. These differences, and the effects on the BCs of varying the abundances of the metals, are shown in a number of instructive plots. Stellar evolutionary grids for -2.5 <= [Fe/H] <=-0.5 have also been computed for the different mixtures. Isochrones based on these tracks are intercompared on the theoretical H-R diagram and on a few of the colour-magnitude diagrams that can be constructed from HST Wide Field Camera 3 (WFC3) F336W, F438W, F606W, F814W, F110W, and F160W observations. For the first application of these models, isochrones have been fitted to WFC3 photometry of the globular cluster NGC 6496 from the HST UV Legacy Survey, with very encouraging results.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: abundances
- stars: evolution
- Hertzsprung-Russell and colour-magnitude diagrams
- stars: Population II
- globular clusters: individual: NGC6496
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- ref (ämneskategori)
- art (ämneskategori)
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