Colloquia Schedule Spring 2016

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

 
Jan. 19

"Spirals, Gaps, and Cavities: Signposts of Planets in Protoplanetary Disks?"

abstract

Robin (Ruobing) Dong

LBNL/Berkeley

host: Adam Kraus

Jan. 26

"The Key Influence of AGB Stars on the Evolution and Global Properties of Galaxies"

Asymptotic Giant Branch stars play a variety of important roles in the Universe, from light-element enrichment of globular clusters to potential domination of a galaxy's dust production and total infrared luminosity. Consequently, they can significantly affect the evolution of their host galaxy and bias galaxy parameters derived from rest-frame near- to to mid-infrared observations. Despite their important role, AGB stars remain poorly modeled in part because of insufficient calibrating observations. I will discuss recent surveys of nearby galaxies that have significantly increased the sample of AGB stars across a wide span of ages and metallicities. In particular, I will focus on the survey of DUST in Nearby Galaxies with Spitzer (DUSTiNGS) and the Panchromatic Hubble Andromeda Treasure (PHAT) program. The DUSTiNGS survey investigated the effect of metallicity on AGB dust production by imaging 50 resolvable dwarf galaxies at mid-IR wavelengths. The survey identified hundreds of 'extreme' dusty AGB stars - the first detected in very metal-poor environments and the first detected beyond the Magellanic Clouds. The PHAT program imaged a third of M31's disk from optical to near-IR wavelengths, resulting in a vast catalog of AGB stars at solar metallicity and known distance. I will summarize the results from both programs and review some future prospects for AGB work in nearby galaxies.

close

Martha L. Boyer

NASA Goddard

host: Kristen McQuinn

Feb. 2

"CAMPARE and Cal-Bridge: Two Synergistic Programs Forming a Successful New Model for Promoting Participation of Women and Underrepresented Minority Students in Astronomy"

abstract

Alexander L. Rudolph

California State Polytechnic University, Pomona

host: William Cochran

Feb. 9

"Exoplanet Atmospheres in High Resolution"

abstract

Jayne L. Birkby

Harvard-Smithsonian Center for Astrophysics

host: Daniel Jaffe

Feb. 16

"The Dynamical Evolution of Young Stellar Complexes in the Milky Way"

abstract

Alison I. Sills

McMaster University, Hamilton, ON

host: Natalie Gosnell

Feb. 23

"The Evolution of Galaxy Structural Properties"

abstract

Rachel Somerville

Rutgers University, Downsbrough Chair in Astrophysics

host: Shardha Jogee

Mar. 1

"A PHAT New Measurement of the High-Mass Stellar IMF"

abstract

Daniel Weisz

UC Berkeley/University of Washington

host: Michael Boylan-Kolchin

Mar. 8

"The Role of Dwarf-Dwarf Galaxy Interactions in Galaxy Assembly"

abstract

Sabrina Stierwalt

NRAO/University of Virginia

host: Kristen McQuinn

Mar. 15

No colloquium scheduled. (Spring Break)

Mar. 22

"Title: TBA"

Khee-Gan Lee

UC Berkeley/LBNL

host: Caitlin Casey

Mar. 29

"Title: TBA"

Hai Fu

University of Iowa

host: Caitlin Casey

Apr. 5

"Title: TBA"

Matthew Benacquista

University of Texas Rio Grande Valley

host: J. Craig Wheeler

Apr. 12

"Title: TBA"

William F. Bottke (Planetary Tinsley Scholar)

Southwest Research Instutite, Boulder, Colorado

host: Mike Endl/Judit Ries

Apr. 19

"Title: TBA"

Tiantian Yuan (Exgal Tinsley Scholar)

Australia National University

host: Chao-Ling Hung

Apr. 26

"Title: TBA"

Michael Cushing

University of Toledo

host: Brendan Bowler

May 3

"Title: TBA"

Kaitlin M. Kratter (ISM Tinsley Scholar)

Steward Observatory, University of Arizona

host: Adam Kraus

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.

5 February 2016
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