Poster Open Access

# Spin Down in Subgiant Stars: Tests of Physics and Main Sequence Braking Models

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{
"description": "<p>The prospect of precise, rotation-based stellar ages drives the development of magnetic braking models for Sun-like stars. The vast majority of these magnetic braking laws have been calibrated on and for main sequence stars. While rotation-age relations lack the same utility on the subgiant branch, subgiant rotational behavior remains an excellent test of the underlying stellar evolutionary models and the magnetic braking prescriptions themselves. I will extend two different main sequence braking models onto the subgiant branch: a &ldquo;standard&rdquo; model in which angular momentum loss occurs smoothly over the entire main sequence, and the more recent &ldquo;weakened&rdquo; magnetic braking model, in which spin down halts roughly midway through the main sequence. I will show that subgiant rotation rates are a discriminating test of whether weakened braking actually occurs on the main sequence, with period predictions that can differ by greater than 50% from the standard case.</p>",
"creator": [
{
"affiliation": "University of Hawaii",
"@type": "Person",
}
],
"url": "https://zenodo.org/record/4567315",
"datePublished": "2021-02-26",
"keywords": [
"Post main sequence cool stars"
],
"@type": "CreativeWork",
"contributor": [
{
"@type": "Person",
"name": "Wolk, Scott"
}
],
"@context": "https://schema.org/",
"identifier": "https://doi.org/10.5281/zenodo.4567315",
"@id": "https://doi.org/10.5281/zenodo.4567315",
"workFeatured": {
"url": "http://coolstars20.cfa.harvard.edu/cs20half/",
"alternateName": "CS20.5",
"location": "virtually anywhere",
"@type": "Event",
"name": "The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun"
},
"name": "Spin Down in Subgiant Stars: Tests of Physics and Main Sequence Braking Models"
}
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