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<div class="">Hello everybody,
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<div class="">Tuesday we are being visited by a third candidates for our tenure-track hire, Dr. Vinicius Placco. Colloquium will start at 4:10 in Room 127. I realize its an odd time, but please come if you are able.</div>
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<div class="">Cheers,</div>
<div class="">Dr. Williams</div>
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<span style="font-kerning: none" class=""><b class="">Special Colloquium</b></span></div>
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<span style="font-kerning: none" class=""><b class="">Department of Physics & Astronomy, TAMU-Commerce</b></span></div>
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<span style="font-kerning: none" class=""><b class="">TUESDAY Nov 6, 4:10-5:00 PM in Science Building 127</b></span></div>
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<span style="font-kerning: none" class=""><b class="">(Note special date)</b></span></div>
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<span style="font-kerning: none" class="">Coffee and cookies will be served at 4:00 PM</span></div>
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<span style="font-kerning: none" class=""><b class="">Stellar Archaeology: Understanding the Origin of the Chemical Elements in the Universe through a 59-Color Map of the Night Sky</b></span><span style="font-size: 18px; line-height: normal; -webkit-font-kerning: none;" class=""><b class=""><br class="">
</b></span><span style="font-size: 14px; line-height: normal; -webkit-font-kerning: none; color: rgb(0, 0, 0); -webkit-text-stroke-color: rgb(0, 0, 0);" class=""><b class="">Dr. Vinicius Placco</b></span></div>
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<span style="font-kerning: none" class=""><b class="">University of Notre Dame </b></span></div>
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<span style="font-kerning: none" class="">Dr. Placco earned a BS in Physics from Universidade de São Paulo in 2005. He completed his PhD in astronomy from Universidade de São Paulo in 2010, then spent time as a postdoctoral fellow in São Paulo, the National
Optical Astronomy Observatories, and Gemini Observatory. Since 2015, Dr. Placco has been a Research Assistant Professor at the University of Notre Dame.</span></div>
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<span style="font-kerning: none" class="">More information about Dr. Placco can be found at</span></div>
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<span style="text-decoration: underline ; font-kerning: none" class=""><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__physics.nd.edu_people_faculty_vinicius-2Dm-2Dplacco_&d=DwMGaQ&c=oqyuZuih6ykib6aKiBq22_bich4AVfYGoLertJN0bEc&r=0FY-iIjI4SqeYwGC2b_NjfnnP9-oBQufaoX9RLyQuLE&m=ATPQY69bg_vhW_Bwq2naQSoGFSy_gOyEKzMEzpEpLAs&s=fkWIOOhM2sScL5OGqUsqwIReZ3KdCF9zldl4TYppyCI&e=" class="">https://physics.nd.edu/people/faculty/vinicius-m-placco/</a></span></div>
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<span style="font-kerning: none" class=""><b class="">Abstract</b></span></p>
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<span style="font-kerning: none" class="">The chemical composition of our bodies, the Earth, the Sun, and the Universe is complex, and the end result of the formation and evolution of numerous stellar generations that contributed all of the elements heavier
than helium. One way to understand the possible pathways that led to such complexity is to determine the chemical abundance patterns of ancient low-metallicity stars in the Halo of our Galaxy. </span><span style="line-height: normal; font-family: Arial; -webkit-font-kerning: none;" class="">These
objects are believed to be </span><span style="font-kerning: none" class="">the stellar relics of the very first stars to be born after the Big-Bang and their abundance patterns serve as observational constraints on the origins of the chemical elements in
the Galaxy and the Universe. However, it is impossible to observe each of the 200 billion stars in the Milky Way in sufficient detail to assess their chemical composition. Hence, astronomers have developed efficient ways to pre-select the most interesting
stars for further high-resolution follow-up, based on the understanding that the colors of stars in specific regions of the optical spectrum are affected in predictable ways by changes in the chemical composition of their atmosphere. I will discuss the importance
of a new observing effort, called J-PAS (Javalambre Physics of the Accelerating Universe Survey), in selecting low-metallicity, carbon-enhanced, and neutron-capture-element enhanced stars, using a 59-color map of the night sky, which will fully exploit this
approach, in a manner superior to all previous such efforts.</span></div>
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<div class="">Dr. Kurtis A. Williams<br class="">
Associate Professor<br class="">
Department of Physics & Astronomy<br class="">
Texas A&M University-Commerce<br class="">
<a href="mailto:kurtis.williams@tamuc.edu" class="">kurtis.williams@tamuc.edu</a><br class="">
(903) 886-5516 </div>
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