Poster Open Access

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

### Citation Style Language JSON Export

{
"publisher": "Zenodo",
"DOI": "10.5281/zenodo.4567315",
"title": "Spin Down in Subgiant Stars: Tests of Physics and Main Sequence Braking Models",
"issued": {
"date-parts": [
[
2021,
2,
26
]
]
},
"abstract": "<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>",
"author": [
{
}
],
"id": "4567315",
"event-place": "virtually anywhere",
"type": "graphic",
"event": "The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5)"
}
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