Poster Open Access

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

van Saders, Jennifer


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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>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "University of Hawaii", 
      "@type": "Person", 
      "name": "van Saders, Jennifer"
    }
  ], 
  "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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