Poster Open Access

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

van Saders, Jennifer

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  <identifier identifierType="DOI">10.5281/zenodo.4567315</identifier>
      <creatorName>van Saders, Jennifer</creatorName>
      <familyName>van Saders</familyName>
      <affiliation>University of Hawaii</affiliation>
    <title>Spin Down in Subgiant Stars: Tests of Physics and Main Sequence Braking Models</title>
    <subject>Post main sequence cool stars</subject>
    <date dateType="Issued">2021-02-26</date>
  <resourceType resourceTypeGeneral="Text">Poster</resourceType>
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    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.4567314</relatedIdentifier>
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    <rights rightsURI="">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">&lt;p&gt;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 &amp;ldquo;standard&amp;rdquo; model in which angular momentum loss occurs smoothly over the entire main sequence, and the more recent &amp;ldquo;weakened&amp;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.&lt;/p&gt;</description>
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