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<p style="margin:0in"><span style="font-size:12.0pt;font-family:"Cambria",serif;color:black">( A PDF attached)<o:p></o:p></span></p>
<p style="margin:0in"><o:p> </o:p></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:28.0pt;font-family:"Cambria",serif;color:#C00000">Spring 2022 Colloquium</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:16.0pt;font-family:"Cambria",serif;color:black">Department of Physics & Astronomy, A&M-Commerce</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:16.0pt;font-family:"Cambria",serif;color:#C00000">Feb 17, Thursday, 4-5 PM in Science Building 127</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:14.0pt;font-family:"Cambria",serif;color:black">(coffee and cookies will be served at 3:50 PM)</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;font-family:"Cambria",serif;color:#00B050">Astronomy</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt;font-family:"Cambria",serif;color:blue">Tales from Old Friends:
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Single and Double White Dwarfs in the Gaia Era<br>
</span></b><b><span style="font-size:14.0pt;font-family:"Cambria",serif;color:black">Dr. Mukremin Kilic</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;font-family:"Cambria",serif;color:#0B5394">University of Oklahoma</span></b><b><span style="font-size:14.0pt;font-family:"Cambria",serif;color:black"> </span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<span style="border:none windowtext 1.0pt;padding:0in"><img width="150" height="203" style="width:1.5625in;height:2.1145in" id="Picture_x0020_2" src="cid:image003.jpg@01D82251.0CF6DCF0"></span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-family:"Cambria",serif;color:black;background:white">Dr. Kilic earned a BS (1999) in Physics at the Bosphorus University in Istanbul (Turkey), and a Ph.D. degree (2006) in Astronomy at the University
of Texas at Austin. His Ph.D. research topic was on cool white dwarfs and the age of the Milky Way Galaxy. He worked as a post-doc at the Ohio State University and the Harvard-Smithsonian Center for Astrophysics. In 2011, Dr. Kilic began his appointment as
an assistant professor at the University of Oklahoma, where he is currently doing research in astrophysics. More information about Dr. Kilic and his research can be found at</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-family:"Cambria",serif;color:black;background:white"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="https://ou.edu/cas/physics-astronomy/people/profiles/kilic"><span style="font-size:12.0pt;font-family:"Cambria",serif;color:#1155CC;background:white">https://ou.edu/cas/physics-astronomy/people/profiles/kilic</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:4.0pt"><b><span style="font-family:"Cambria",serif;color:black">Abstract</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:13.0pt;font-family:"Cambria",serif;color:black;background:white">ESA's Gaia mission has finally revealed the population of faint white dwarf stars in the solar neighborhood. We use this
dataset to answer fundamental questions about the nature of white dwarfs, including their mass distribution, cooling physics, and ultracool white dwarfs. We also use the same dataset to search for the most massive white dwarfs. We provide evidence that a significant
fraction of the most massive white dwarfs form through mergers. We conclude by highlighting the discovery of an ultramassive white dwarf with a spin period of only 70 seconds.</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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