Colloquia Schedule Fall 2015

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

Sep. 1

No Colloquium scheduled.

Sep. 8

"Convection in Cool Stars, as Revealed through Stellar Brightness Variations"


Fabienne Bastien

Pennsylvania State University

host: Adam Kraus or Bill Cochran

Sep. 15

"Compact Objects in Globular Clusters"


Thomas Maccarone

Texas Tech

host: Karl Gebhardt

Sep. 22

"Convection in Low-Mass Stellar Evolution, or 'What about magnetic fields?' "

A majority of stars in the Galaxy are low-mass main-sequence stars that have convective outer layers. Convection is an important physical process, particularly in near surface layers, governing the observable properties of a star and influencing the whole of a star's interior structure. Briefly, I will review the basic physics of stellar convection and contrast it with mixing length theory, the simple phenomenological description widely used in stellar evolution models. Convective properties of low-mass stars under mixing length theory are typically assumed to be qualitatively similar to those in the Sun, within some scaling factor. I will present results from ongoing investigations that explore the validity of this assumption within the framework of mixing length theory and discuss disagreements with predictions from radiation-hydrodynamic simulations. Finally, I'll explore the role that magnetism plays in these discussions and whether it is responsible for the aforementioned disagreements, among other notable problems in stellar evolution theory.


Gregory Feiden

University of Uppsala, Sweden

host: Andrew Mann

Sep. 29

"Tracing the Cosmic Shutdown of Star Formation in Massive Galaxies"


Katherine Whitaker

Hubble Fellow, UMass Amherst

host: Steve Finkelstein

Oct. 6

"The Assembly of Disk Galaxies"


Susan Kassin

Space Telescope Science Institute

host: Rachael Livermore

Oct. 13

"Are we Correctly Measuring Star Formation Rates?"


Kristen McQuinn

University of Texas at Austin

host: Adam Kraus

Oct. 20

No Colloquium Scheduled, to avoid conflict with:
Bashfest 2015: Frank N. Bash Symposium 2015, October 18-20, 2015

Speaker: Dr. Frank N. Bash and invited speakers

"New Horizons in Astronomy"

Oct. 27

Tinsley Scholar: Interstellar Group (visiting: Oct 25-31)

"The Impact of Stellar Feedback on Molecular Clouds"


Stella Offner

Affiliation: University of Massachusetts, Amherst

host: Neal Evans

Nov. 3

Tinsley Scholar: Theory Group (visiting: late Oct - early Nov)

"Disk Dynamos: Understanding the Origin of Galacic Magnetic Fields"


Ethan Vishniac

Johns Hopkins University

host: TBD

Nov. 10

"From TripleSpec to NEWS: Exoplanet Discovery Science with Bread and Butter Infrared Spectroscopy"


Philip S. Muirhead

Boston University

host: Adam Kraus

Nov. 17

"New Insights on Galaxy Formation from Comparisons of Simulated and Observed Galaxies"


Joel R. Primack

UC Santa Cruz

host: Paul Shapiro

Nov. 24

No colloquium scheduled.

Dec. 1

DeVaucouleurs Medalist

"Expansion of the Universe Seen by Hubble"


Adam Riess

Johns-Hopkins University, and Space Telescope Science Institute, and DeVaucouleurs Medalist

host: Shardha Jogee, Chair

Dec. 8

"Supernovae and their Progenitor Systems (or lack thereof)"


Ori Fox

Space Telescope Science Institute

host: Jeff Silverman

Visitors to the Department of Astronomy can find detailed information and maps on our Visiting Austin Page.

Please report omissions/corrections to: G. Orris at

23 November 2015
Astronomy Program · The University of Texas at Austin
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