DAS Activities

DAS Public Nights

Public Nights
Tuesday and Thursday at
DU's Historic Chamberlin Observatory
Current start time is 7:30 pm
Costs to the public are:
$4.00 adults, $3.00 children

To book, please click:

Public Night

General Meeting – September 2018

When:
September 21, 2018 @ 7:30 pm – 9:30 pm
2018-09-21T19:30:00-06:00
2018-09-21T21:30:00-06:00
Where:
DU's Olin Hall, Room 105
2190 E Iliff Ave
Denver, CO 80210
USA

Dr. Toshiya Ueta, University of Denver

Dr. Toshiya Ueta, University of Denver

Research to Detect the Total Mass Ejected from Planetary Nebulae

Planetary nebulae are evolved stars of low to intermediate initial mass (0.8-8 solar masses, i.e., like our Sun) that experience the last throes of mass loss near the end of their lives. Supposedly these stars are to become extremely dense white dwarfs whose average mass is 0.6 solar masses. If so, it would be “naively” expected that 0.2 to 7.4 solar mass worth of matter would be ejected by the central star into space.

However, we have never observationally accounted for the total amount of mass that has been ejected. Dr. Ueta and his collaborators recently attempted this by collecting data from X-ray to radio frequencies, analyzing them for each component (ionized, atomic, and molecular gases and dust grains), and using the results of the analyses as inputs and constraints for dusty photo-ionization modeling. He will discuss how that simple question turned out to be an epic.

Toshiya Ueta graduated with Ph.D. Astronomy from the University of Illinois at Urbana-Champaign in 2002. After spending time as an assistant astronomer at the Royal Observatory of Belgium and as a U.S. National Research Council research associate and a NASA post-doctoral fellow at the SOFIA Science Office at the NASA Ames Research Center, Ueta joined the University of Denver in 2006 as an assistant professor and became an associate professor in 2012. His research interests include circumstellar phenomena such as mass loss and circumstellar wind and their effects on the chemical enrichment of the interstellar medium.

See more information about DAS General Meetings (parking, reception, etc.) HERE

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