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<span style="font-size: 28pt; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; background-color: transparent;">Fall 2017 Colloquium</span></p>
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<span style="font-size: 16pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Department of Physics & Astronomy, TAMU-Commerce</span></p>
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<span style="font-size: 16pt; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; background-color: transparent;">Oct 12, Thursday, 4-5 PM in Science Building 127</span></p>
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<span style="font-size: 14pt; vertical-align: baseline; background-color: transparent;">(coffee and cookies will be served at 3:50 PM)</span></p>
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<span style="font-size: 18pt; color: rgb(0, 176, 80); font-weight: 700; vertical-align: baseline; background-color: transparent;">Astronomy</span></p>
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<span style="font-size: 18pt; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; background-color: transparent;">Calibrating white dwarf asteroseismic fitting techniques</span><span style="font-size: 18pt; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; background-color: transparent;"><br class="kix-line-break">
</span><span style="font-size: 14pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Dr. Barbara Castanheira Endl</span></p>
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<span style="font-size: 14pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Baylor University and University of Texas at Austin
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<div style="text-align: center;"><img src="https://lh6.googleusercontent.com/HhC7_BTfxF5URJUa2fwq83rnkpMWuikgQ7RP0_NEhWF3CxKwxa2PszvuejKYItDxU0TeKLtrhXuZxN6lTKZNI4N4PpL4J8OqnFmoohV57X7_5rwOeJE6C7E1XXypbOGNZ1MSLN1M" width="140" height="193" originalwidth="140" originalheight="193" style="font-size: 11pt; border: none; transform: rotate(0rad); -webkit-transform: rotate(0rad);"></div>
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<span style="font-size: 12pt; vertical-align: baseline;">Dr. Endl earned her BS (2002), MS (2003), and PhD (2007) from Federal University of Rio Grande do Sul (UFRGS) in Brazil. She studied on white dwarf and pulsating stars on her PhD thesis. She was a postdoctoral
researcher at the University of Vienna, Austria and the University of Texas at Austin, USA. She did research on pulsating stars and spectroscopy of white dwarf stars during her postdoctoral period. Currently she is a lecturer at Baylor University. She has
published more than 60 journal papers.</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:4pt;"><span style="font-size: 12pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Abstract
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<span style="font-size: 12pt; vertical-align: baseline;">The main goal of looking for intrinsic variability in stars is the unique opportunity to study their internal structure. Once we have extracted independent modes from the data, it appears to be a simple
matter of comparing the period spectrum with those from theoretical model grids to learn the inner structure of that star. However, asteroseismology is much more complicated than this simple description. We must account not only for observational uncertainties
in period determination, but most importantly for the limitations of the model grids, coming from the uncertainties in the constitutive physics, and of the fitting techniques. In this presentation, we will discuss results of numerical experiments where we
used different independently calculated model grids (white dwarf cooling models WDEC and fully evolutionary LPCODE-PUL) and fitting techniques to fit synthetic stars. The advantage of using synthetic stars is that we know the details of their interior structure
so we can assess how well our models and fitting techniques are able to the recover the interior structure, as well as the stellar parameters.</span></p>
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