Estimating the Convective Turnover Time
| Autor: | Wei-Chun Jao, Andrew A. Couperus, Eliot H. Vrijmoet, Nicholas J Wright, Todd J. Henry |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Popis: | The introduction of the Rossby number (R$_0$), which incorporates the convective turnover time ($\tau$), in 1984 was a pioneering idea for understanding the correlation between stellar rotation and activity. The convective turnover time, which cannot be measured directly, is often inferred using existing $\tau$-mass or $\tau$-color relations, typically established based on an ensemble of different types of stars by assuming that $\tau$ is a function of mass. In this work, we use {\it Gaia} Early Data Release 3 to demonstrate that the masses used to establish one of the most cited $\tau$-mass relations are overestimated for G type dwarfs and significantly underestimated for late M dwarfs, offsets that affect studies using this $\tau$-mass relation to draw conclusions. We discuss the challenges of creating such relations then and now. In the era of {\it Gaia} and other large datasets, stars used to establish these relations require characterization in a multi-dimensional space, rather than via the single-characteristic relations of the past. We propose that new multi-dimensional relations should be established based on updated theoretical models and all available stellar parameters for different interior structures from a set of carefully vetted single stars, so that the convective turnover time can be estimated more accurately. Comment: 8 pages, 2 figures, 1 table. One of the figures is a 3D interactive plot, which is available in the online journal or at https://www.chara.gsu.edu/~jao/3D.html |
| Databáze: | OpenAIRE |
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