College of Arts and Sciences
Astronomy Department

Astronomy Events Calendar

The College Astronomy Home Astronomy Events Colloquium Events Outreach Events IUB Home

Event Information

print  
Title: Garrett Somers (Vanderbilt University), Title: Improving 1-D stellar evolution models with magnetic activity and rotation
Start Time: Tuesday October 23, 2018 04:00 PM
End Time: Tuesday October 23, 2018 05:00 PM
Location: A tea will precede the talk at 3:30 pm in room SW 405. The location of the talk is in SE 240.
Contact: Bob Lezotte
Description:

Abstract:

For over a century, astronomers have been building physical models to study the internal structure of stars. These efforts have culminated in the so-called “standard stellar model”, the computational framework which defines much of the modern theory of stellar evolution stands. These models have been extremely successful at describing many observational properties of stars, including the intricate morphology of the color-magnitude diagrams of star clusters, the observed mass-radius relationship on the hydrogen-burning main sequence, and the detailed interior structure of the Sun.

Nonetheless, there remain several outstanding features of the galactic stellar pattern that our models fail to predict, and it is these discrepancies which point to interesting physical processes occurring in stars that have previously been neglected. In this talk, I will discuss some conspicuous failings of the standard picture of stellar evolution, and my efforts to reconcile theory with observations through the introducing of relevant but often ignored physical effects—including the structural and mixing effects of rotation and magnetic activity—into a modern stellar evolution code. I will show that such improvements can greatly improve the accuracy of certain model predictions, and hold important implications for the age scale of young stars and our ability to infer their fundamental parameters. I will also introduce a forthcoming set of public stellar models which incorporate the effects of magnetic starspots on the structure, evolution, and colors of solar-type stars.

Contact Email: astdept@indiana.edu
Cost: Free
copy to my calendar back

Astronomy Department
astdept@indiana.edu
727 East 3rd Street, Swain Hall West 319
Bloomington, IN 47405-7105

Comments: astronomy Department@indiana.edu