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Cool and data-driven :
Cool and data-driven : an exploration of optical cool dwarf chemistry with both data-driven and physical models
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- Rains, Adam (author)
- Uppsala universitet,Observationell astrofysik,Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
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- Nordlander, Thomas (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia.
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- Monty, Stephanie (author)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
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- Casey, Andrew R. (author)
- ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia.;Monash Univ, Sch Phys & Astron, Wellington Rd, Clayton, Vic 3800, Australia.
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- Rojas-Ayala, Barbara (author)
- Univ Tarapaca, Inst Alta Invest, Casilla 7D, Arica, Chile.
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- Zerjal, Marusa (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;Inst Astrofis Canarias, E-38205 Tenerife, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.
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- Ireland, Michael J. (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
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- Casagrande, Luca (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia.
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- McKenzie, Madeleine (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia.
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(creator_code:org_t)
- Oxford University Press, 2024
- 2024
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 529:4, s. 3171-3196
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Abstract
Subject headings
Close
- Detailed chemical studies of F/G/K - or solar-type - stars have long been routine in stellar astrophysics, enabling studies in both Galactic chemodynamics and exoplanet demographics. However, similar understanding of the chemistry of M and late-K dwarfs - the most common stars in the Galaxy - has been greatly hampered both observationally and theoretically by the complex molecular chemistry of their atmospheres. Here, we present a new implementation of the data-driven Cannon model, modelling Teff, log g, [Fe/H], and [Ti/Fe] trained on low-medium resolution optical spectra (4000-7000 & Aring;) from 103 cool dwarf benchmarks. Alongside this, we also investigate the sensitivity of optical wavelengths to various atomic and molecular species using both data-driven and theoretical means via a custom grid of MARCS synthetic spectra, and make recommendations for where MARCS struggles to reproduce cool dwarf fluxes. Under leave-one-out cross-validation, our Cannon model is capable of recovering Teff, log g, [Fe/H], and [Ti/Fe] with precisions of 1.4 per cent, ±0.04 dex, ±0.10 dex, and ±0.06 dex respectively, with the recovery of [Ti/Fe] pointing to the as-yet mostly untapped potential of exploiting the abundant - but complex - chemical information within optical spectra of cool stars.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- methods: data analysis
- techniques: spectroscopic
- stars: fundamental parameters
- stars: low-mass
Publication and Content Type
- ref (subject category)
- art (subject category)
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