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Rotation in Red Giants

Tayar, Jamie Nicole
http://rave.ohiolink.edu/etdc/view?acc_num=osu1531927526281553

Abstract Details

2018, Doctor of Philosophy, Ohio State University, Astronomy.
Real stars rotate, and rotation can have profound consequences for stellar structure and evolution. Despite this, rotation is frequently ignored in evolved stars, or treated in a highly simplified fashion. Previously, the surface and interior rotation rates of low mass red giant stars were poorly constrained and the uncertainty in the models could be marginalized over. However, in an era of space-based photometry and large spectroscopic surveys, it is now possible to measure the rotation rates of red giants, and to use these measurements to place novel constraints on the physics of these stars. In this dissertation, I use the newly obtained large and precise asteroseismic and spectroscopic data sets in comparison with stellar models to better understand red giant stars. I have identified important differences between data and models for evolved stars. I have proposed improvements to the fundamental temperature predictions of these models, and then used the improved models to demonstrate that current models do not adequate the rotational physics of these stars. Using both surface and core rotation rates and studying trends in representative samples. I have demonstrated that the coupling between the core and surface rotation rates of evolved stars are evolutionary state dependent, shown that a standard Kawaler angular momentum loss law is insufficient for evolved stars, found evidence for radial differential rotation in the convective zones of intermediate mass stars, calculated that the timescales for rotational coupling of giants are long compared to the pre-main-sequence, and placed a lower limit on the fraction of stars that interact on the giant branch of 10%.
Marc Pinsonneault (Advisor)
Jennifer Johnson (Committee Member)
Krzysztof Stanek (Committee Member)
191 p.
Astronomy
stars; stellar evolution; stellar rotation; red giants

Recommended Citations

Citations

  • Tayar, J. N. (2018). Rotation in Red Giants [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531927526281553

    APA Style (7th edition)

  • Tayar, Jamie. Rotation in Red Giants. 2018. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1531927526281553.

    MLA Style (8th edition)

  • Tayar, Jamie. "Rotation in Red Giants." Doctoral dissertation, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531927526281553

    Chicago Manual of Style (17th edition)

osu1531927526281553
361
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This open access ETD is published by The Ohio State University and OhioLINK.