Colloquia Schedule Fall 2016

Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B

Aug. 30

Setting Stellar Chronometers: The PTF(+) Open Cluster Survey

A star's age is one of its most fundamental parameters. It is also, for most stars, notoriously difficult to measure. While we have known for 40 years of the existence of a relation between a star's age, rotation, and magnetic activity, observational limitations have hampered the assembly of uniform samples of rotation and activity measurements for stars spanning a wide range of ages and masses. We are still far from being able to describe fully the evolution of either rotation or activity for stars of a given mass, or from being able to use rotation or activity measurements to estimate accurately the ages of isolated field stars. Fortunately, recent technological advances have transformed our ability to characterize open clusters, which provide the optimal environment for obtaining robust age estimates for individual stars. I will describe results from our efforts to assemble a complete sample of rotation and activity measurements for low-mass stars in six open clusters ranging in age from 35 Myr to 2.5 Gyr, focusing on our recent work in the Hyades, NGC 752, the Pleiades, and Praesepe. Testing our data against theory will allow us to develop a better understanding of the age-rotation-activity relation for these stars from their arrival on the zero-age main sequence to when they are a significant fraction of the age of the Sun.


Marcel Agueros

Columbia University

host: Adam Kraus

Sep. 6

Title: TBA

Stephen Wilkins

University of Sussex

host: Steve Finkelstein

Sep. 13

The Milky Way Laboratory


Cara Battersby

Harvard-Smithsonian Center for Astrophysics

host: Neal Evans

Sep. 20

Title: TBA

Speaker: TBD


host: TBD

Sep. 27

Title: TBA

Elisabeth Newton

Massachusetts Institute of Technology Kavli Institute for Astrophysics and Space Research

host: Andrew Mann

Oct. 4

Title: TBA

Nia Imara

Harvard-Smithsonian Center for Astrophysics

host: Neal Evans/Caitlin Casey

Oct. 11

Title: TBA

UT Postdocs

The University of Texas at Austin

Oct. 18

Title: TBA

Erik Petigura

California Institute of Technology

host: Brendan Bowler

Oct. 25

Title: TBA

Paul Robertson

Penn State University

host: Greg Mace

Nov. 1

Title: TBA

Kelly Holley-Bockelmann

Vanderbilt University

host: Craig Wheeler/Eva Noyola

Nov. 8

Title: TBA

Matteo Brogi

University of Colorado Boulder

host: Dan Jaffe

Nov. 15

Title: TBA

Eve Ostriker

Princeton University

host: Volker Bromm

Nov. 22

Title: TBA

Sean Gulick

The University of Texas at Austin Institute for Geophysics

host: Bill Cochran

Nov. 29

Title: TBA

Alexandra Pope

University of Massachusetts Amherst

host: Caitlin Casey

Dec. 6

Title: TBA

David Sand

Texas Tech University

host: Kristy McQuinn

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7 June 2016
Astronomy Program · The University of Texas at Austin
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