Colloquia Schedule Fall 2011

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

Aug. 30

Not your Parents' M Dwarfs: Probing the Milky Way with its Smallest Constituents (Cancelled due to Hurricane Irene: to be rescheduled)

M and (early-type) L dwarfs are the smallest, coolest and least massive stars in the Galaxy. Yet despite their diminutive physical properties, low-mass stars make up ~70% of all of the stars in the Milky Way and have main sequence lifetimes that exceed trillions of years. Their dominance in the Galaxy make M dwarfs excellent tracers of both the structure and evolution of the local Milky Way. In addition, low-mass dwarfs have intense stellar flares and strong magnetic fields that allow us to probe their interiors and may have important consequences for the habitability of planets that orbit them. I will present results from the largest samples of low-mass stars ever assembled. The advent of large surveys such as the Sloan Digital Sky Survey (SDSS) has yielded photometric and spectroscopic catalogs of more than 100 million and 70,000 stars respectively. Specifically, I will highlight work that has used the unprecedented statistical power of the SDSS to examine the structure and kinematics of low-mass dwarfs in the Milky Way, as well as the nature of their magnetic fields (and subsequent activity) and what this may tell us about the ages of stars. In addition, I will share some resent results from a survey that cataloged some of the widest binaries in the Milky Way and demonstrate how a large sample of M dwarfs has helped us map the three-dimensional distribution of dust in the local Galaxy.

close

Andrew A. West

Boston University

host: Colette Salyk

Sept. 6

Maxwell, Einstein, and Their Impossibilities

abstract

Mark G. Raizen

Center for Nonlinear Dynamics & Dept. of Physics, University of Texas at Austin

hosts: Paul Shapiro & Tanja Rindler-Daller

Sept. 13

Dark Matter, Dwarf Galaxies, and Massive Failures in the Halo of the Milky Way

abstract

James S. Bullock

University of California, Irvine

host: TBD

Sept. 20

Black Hole Scaling Relations

abstract

Kayhan Gultekin

University of Michigan

host: Karl Gebhardt

Sept. 27

The Quest for the Dynamical Signature of Close Supermassive Binary Black Holes

abstract

Michael Eracleous

Pennsylvania State University

host: Julie Comerford

Oct. 4

What is a Galaxy?

abstract

Beth Willman

Haverford College

host: TBD

Oct. 11

No talk scheduled, to avoid conflict with Frank N. Bash Symposium
(held: October 9-11, 2011).

Oct. 18

Status update on the James Webb Space Telescope project

abstract

Jane Rigby

NASA Goddard Space Flight Center

host: TBD

Oct. 25

GAMA: from Little Blue Fuzzies to Massive Red Monsters and Beyond

abstract

Sarah Brough

Swinburne University

host: Karl Gebhardt

Nov. 1

Casting Shadows on the Standard Interstellar Medium Paradigm with GALFA-HI

abstract

Joshua E. G. Peek

Columbia University

host: Sarah Tuttle

Nov. 8

Beatrice M. Tinsley Visiting Scholar

The Origins of Planetary Systems - Constraints from Protoplanetary Disks

abstract

Ilaria Pascucci

University of Arizona

host: John Lacy

Nov. 15

No talk scheduled.

Nov. 22

No talk scheduled.

Nov. 29

Stellar Forensics with Explosions: Supernovae, Gamma-Ray Bursts, and their Environments

abstract

Maryam Modjaz

New York University, Center for Cosmology and Particle Physics

host: Sarah Tuttle

Dec. 13

HETDEX Special Colloquium

Astrophotonics and Space Photonics: A New Era of Instrumentation

abstract

Lisa Fogarty

University of Sydney, School of Physics

host: Sarah Tuttle

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 argus@astro.as.utexas.edu.

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