Colloquia Schedule Spring 2014
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
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No talk scheduled. |
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"The Connection between Star Formation and the Cold Interstellar Medium in Nearby Galaxies" University of Arizona host: Shardha Jogee |
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"The Unusual Eclipser of the Young Star J1407: Moon-forming Circumplanetary Disk?" University of Rochester host: TBA |
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"A Calibration of the Stellar-mass Fundamental Plane at
Massachusetts Institute of Technology host: Pawan Kumar |
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Tinsley Visiting Scholar, Interstellar Matter Group "Volatiles in Protoplanetary Disks" Space Telescope Science Institute (STScI) host: Neal Evans |
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DeVaucouleurs Medalist: COLLOQUIUM "Connecting Gas to Stars in Galaxies" University of Cambridge, UK host: Neal Evans |
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DeVaucouleurs Medalist: PUBLIC LECTURE "The Hidden Universe Revealed" University of Cambridge, UK host: Neal Evans |
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"The Seeds of Massive Galaxies" University of Edinburgh host: Shardha Jogee |
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"Our Galactic Supermassive Black Hole Sgr A*: The Ideal Testbed for Theories of Accretion and Black Hole Life Cycles" University of Amsterdam host: Pawan Kumar |
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Spring Break: 10-14 March: No talk scheduled. |
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"Rest-frame Optical Spectra: A Window into Galaxy Formation at z~2" University of California, Los Angeles host: Steve Finkelstein |
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Tinsley Visiting Scholar, Stars Group "Hunting the First Generations of Stars and Galaxies" The new Australian SkyMapper 1.3m telescope is carrying out a
photometric survey of the entire Southern Sky. By using a ugriz filter
plus an additionally narrow filter placed at the Ca K line at 3933A,
stellar parameters can be obtained for all stars observed. This allows
for an efficient selection of a variety of stellar types, including
metal-poor stars. Recent efforts to search for the most metal-poor
stars have indeed delivered a new record holder for the most iron-poor
star: no iron lines were detected in the high-resolution follow-up
Magellan spectrum and only an upper limit of [Fe/H]<-7.1 could be
determined. Contrary to its iron deficiency, the star has a
significant amount of carbon. This abundance pattern can be explained
with the star being a second-generation star in the universe which
formed from a gas cloud enriched by only one Pop III first star. What
was the environment in which these early stellar generations formed? A
spectroscopic study of the faintest dwarf galaxy Segue 1 has shed
light on this question. Given the chemical abundance patterns of some
of its only few stars (with metallicities ranging from -4 < [Fe/H] <
-1) this suggests that this tiny galaxy may be a surviving first galaxy from
the early universe. This suggestion is in line with recent age
measurements for a similar ultra-faint dwarf which showed these galaxies
to be single-age stellar systems that are about as old as the universe itself. Massachusetts Institute of Technology host: Fritz Benedict |
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"Shadows of Their Future Selves: Accretion and Obscuration in Young Stellar Objects" Lowell Observatory host: Adam Kraus |
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"Head in the Clouds: Decoding the Spectral Features Produced by Brown Dwarf and Exoplanent Atmospheres" Hunter College/AMNH host: Adam Kraus |
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PhD Defense Presentation "Measuring Dark Matter Profiles Non-Parametrically in Dwarf Spheroidal Galaxies" University of Texas at Austin |
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"Hunting the First Galaxies with Gravitational Lensing" Space Telescope Science Institute (STScI) host: Steve Finkelstein |
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Tinsley Visiting Professor "Adventures in Cosmic Star Formation" National Optical Astronomy Observatory (NOAO) host: TBA |
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Tinsley Visiting Scholar, Exgal Group "MaNGA: Mapping Nearby Galaxies at Apache Point Observatory An IFU Survey of 10,000 Galaxies" University of Tokyo, IPMU host: Niv Drory |
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Tinsley Visiting Scholar, Planets Group "Extrasolar Planets with Small Telescopes" Princeton University host: Mike Endl |
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No talk scheduled. |
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"Stark Broadening of Hydrogen Spectral Lines in Plasmas: Advanced Theories, Benchmark Experiments, Astrophysical Applications" Auburn University host: Don Winget |
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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