4557578
doi
10.5281/zenodo.4557578
oai:zenodo.org:4557578
user-coolstars20half
Tides, Differential Rotation, and Eclipsing Binaries
Adam S. Jermyn
Flatiron Institute Center for Computational Astrophysics
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
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Cool Stars on the main sequence
<p>A poster for the Cool Stars 20.5 Virtual Conference. Based on this paper:</p>
<p>Jermyn, Tayar, & Fuller 2020: https://academic.oup.com/mnras/article/491/1/690/5607798</p>
<p>Abstract:</p>
<p>Over time, tides synchronize the rotation periods of stars in a binary system to the orbital period. However, if the star exhibits differential rotation, then only a portion of it can rotate at the orbital period, so the rotation period at the surface may not match the orbital period. The difference between the rotation and orbital periods can therefore be used to infer the extent of the differential rotation. We use a simple parametrization of differential rotation in stars with convective envelopes in circular orbits to predict the difference between the surface rotation period and the orbital period. Comparing this parametrization to observed eclipsing binary systems, we find that in the surface convection zones of stars in short-period binaries there is very little radial differential rotation, with |r∂<sub>r</sub>ln Ω| < 0.02. This holds even for longer orbital periods, though it is harder to say which systems are synchronized at long periods, and larger differential rotation is degenerate with asynchronous rotation.</p>
Zenodo
2021-02-23
info:eu-repo/semantics/conferencePoster
4557577
user-coolstars20half
1614169636.681854
4990353
md5:d5c5a9ed41f529d5d606a41e77943c52
https://zenodo.org/records/4557578/files/Jermyn A.pdf
public
10.5281/zenodo.4557577
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doi