Wednesday, April 14, 2021, 12:00pm - 01:00pm
This repeat is an exception to the normal repeat pattern
Harriet Dinerstein, The University of Texas at Austin
New Emission Lines of Neutron-Capture Elements Discovered with HPF on HET and iSHELL on IRTF
Abstract
About half the Solar System inventory of trans-iron elements were created through slow neutron capture reactions, some of which took place in evolved low-mass stars while on the late Asymptotic Giant Branch (AGB). The envelopes of these stars are expelled via planetary nebulae and contribute to the chemical evolution of the Galaxy. We have been using infrared spectroscopy with instruments such as IGRINS on the McDonald Observatory 2.7m to measure s-process enrichments of several elements in planetary nebulae. In this talk I report recent discoveries of new infrared lines from the light s-process products Br and Rb (atomic numbers 35 and 37) with iSHELL on the IRTF, and from the heavier elements Te and Xe (52 and 54) with HPF on the HET. These lines will provide new information on AGB nucleosynthesis and the origin of the trans-iron elements.
Danny Krolikowski, The University of Texas at Austin
Gaia EDR3 Reveals the Complicated Substructure and Star Formation History of the Greater Taurus Star Forming Region
Location: Online