ASTR 400/500: GRADUATE SEMINAR. TITLES AND ABSTRACTS (SPRING 2018)

Jan 10: Dr. Patrick Hartigan
Title: Organizational Meeting
Abstract: The organizational meeting to set speaker schedules.


Jan 24: Dr. Stephane Guilloteau [Univ. Bordeaux, France]
Title: Disks around young stars: Weighing the stars and their disks
Abstract: Astronomers deduce the masses and ages of stars by their positions on Hertzsprung-Russell diagrams (HRDs) relative to models of stellar evolution and their isochrones. This procedure is regarded as reliable for stars on the main sequence but is much more uncertain for young stars. I will report on direct (dynamical) mass measurements of young stars in using the IRAM millimeter array (now NOEMA) and ALMA to attempt to test and validate evolutionary models. Comparison of the dynamical masses with those predicted from other stars characteristics (effective temperature, spectral type and luminosity) by evolutionary models reveal many discrepancies. Potential causes will be briefly discussed. Strategies to improve our knowledge in this area will be presented.

The ultimate goal of the project was to uncover a timeline for disk evolution, assessing e.g. how disk masses and sizes change with star (= disk) age. I will briefly discuss this second aspect of the study, and how (again) measuring masses (of the disks now) is a real challenge.


Jan 31:
TBD
Title: TBD
Abstract:

Laura Flagg
Title: TBD
Abstract:
Feb 7:
Asa Stahl
Title: TBD
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Maxwell Hummel
Title: TBD
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Feb 14: Dr. Patrick Hartigan [Rice]
Title: TBD
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Feb 21: Dr. Michael Johnson [York Univ.]
Title: TBD
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Feb 28: Dr. George Younes [George Washington Univ.]
Title: TBD
Abstract:
Mar 7: Yingchao Lu
Title: TBD
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Mar 21: TBD
Title: TBD
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Mar 28: TBD
Title: TBD
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Apr 4: Dr. Jin Koda [Stony Brook Univ.]
Title: TBD
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Apr 11:
Erik Weaver
Title: TBD
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Kun Hu
Title: TBD
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Apr 18: Jason Ling
Title: TBD Abstract: