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<h1><a href="index.html">GRANTS</a></h1>
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<p class="slogan">Stellar Pulsation, space photometry, exoplanets (SPEX)</p>
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<p> <a name="ref"><font color="#c4ab6b" size="4"><b>PD-123910: Evolved compact stars in the era of photometric space missions (2017-2020)</b></a></font></p>
<p>PI: Zsófia Bognár</p>
<br>
<p> <a name="ref"><font color="#c4ab6b" size="2"><b>Summary:</b></a></font></p>
<p>This research project aims at learning more about evolved compact stars,
namely white dwarf and hot subdwarf stars. Our Sun, as the majority of the stars,
will also become a white dwarf eventually, while hot subdwarfs evolve following a
different path. We assume that hot subdwarfs are products of evolution in a binary
system, or the presence of substellar companion(s) influenced their evolution.
Such stellar or substellar (e.g. planet-sized) companions can be discovered by
investigating the pulsations of the compact star or with the light variations
caused by their passing in front of each other.</p>
<p>Excitation of pulsations in the stellar interiors of these objects are common
in specific temperature ranges, which offers a unique opportunity to study their
structure, rotation, and the dynamical processes operating in them. The best way
of such so-called asteroseismic investigations is the use of continuous, long
time-base, high-quality space-based data. In this project, the PI intends to play
an active role in the activities of the NASA <i>TESS</i> (Transiting Exoplanet Survey Satellite)
photometric space mission, which is planned to observe more than 4000 evolved compact
stars, including known pulsators and candidates. Besides the analyses of space-based data,
the PI will also perform ground-based complementary observations to gain more information
on the light variations of <i>TESS</i> targets and to learn more about the pulsational behaviour
of the members of the most populated group of white dwarf variables, the ZZ Ceti stars.
This project will strengthen Hungary's participation in the compact variable studies
both in Europe and worldwide.</p>
<p><b>Project no. 123910 has been implemented with the support provided from the National Research, Development and
Innovation Fund of Hungary, financed under the P_17 funding scheme.</b></p>
<br>
<p> <a name="ref"><font color="#c4ab6b" size="2"><b>Publications:</b></a></font></p>
<p><strong>Papers in ISI journals:</strong></p>
<ol>
<li><p><b>3. </b><strong>„Searching for new white dwarf pulsators for TESS observations at Konkoly Observatory”</strong><br><u>Bognár, Zs.</u>; Kalup, Cs.; Sódor, Á.; Charpinet, S.; Hermes, J. J.: <strong>2018</strong>, <em>MNRAS</em>, 478, 2676, <A href="http://adsabs.harvard.edu/abs/2018MNRAS.478.2676B"><strong>ADS</strong></A></p></li>
<li><p><b>2. </b><strong>„The Delta Scuti star 38 Eri from the ground and from space”</strong><br>Paparó, M.; Kolláth, Z.; Shobbrook, R. R.; Matthews, J. M.; Antoci, V.; Benkő, J. M.; Park, N.-K.; Mirtorabi, M. T.; Luedeke, K.; Kusakin, A.; <u>Bognár, Zs.</u> et al.: <strong>2018</strong>, <em>MNRAS</em>, 477, 4362, <A href="http://adsabs.harvard.edu/abs/2018MNRAS.477.4362P"><strong>ADS</strong></A></p></li>
<li><p><b>1. </b><strong>„Multi-technique investigation of the binary fraction among A-F type candidate hybrid variable stars discovered by Kepler”</strong><br>Lampens, P.; Frémat, Y.; Vermeylen, L.; Sódor, Á.; Skarka, M.; De Cat, P.; <u>Bognár, Zs.</u> et al.: <strong>2018</strong>, <em>A&A</em>, 610, A17, <A href="http://adsabs.harvard.edu/abs/2018A%26A...610A..17L"><strong>ADS</strong></A></p></li>
</ol>
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<p> <a name="ref"><font color="#c4ab6b" size="2"><b>Dissemination of our results: popular science articles, public lectures, posters:</b></a></font>
<ol>
<li><p><b>5.</b> <strong>„Searching for new DA white dwarf pulsators at Konkoly Observatory”</strong><br><u>Bognár, Zs.</u>; Kalup, Cs.; Sódor, Á., <em>poster</em>, XXXth General Assembly of the International Astronomical Union (Vienna, August 20-31, 2018) <a href="prezentaciok/poszter_iauga2018.pdf">(pdf)</a></p></li>
<li><p><b>4.</b> <strong>„Efficient Frequency Identification in Coherent Variable Stars”</strong><br>Sódor, Á., <u>Bognár, Zs.</u>; Skarka, M., <em>poster</em>, XXXth General Assembly of the International Astronomical Union (Vienna, August 20-31, 2018) <a href="prezentaciok/201808_Sodor_IAU_GA_poster.pdf">(pdf)</a></p></li>
<li><p><b>3.</b> <strong>„Pulzáló fehér törpecsillagok anatómiája”</strong><br><u>Bognár, Zs.</u>: <strong>2018</strong>, <em>Természet Világa</em>, 149/7, 308</p></li>
<li><p><b>2.</b> 2017, 23 November: <strong>„Latest news on white dwarf pulsators in the light of space- and ground-based observations”</strong> – seminar at Konkoly Observatory, Budapest, Hungary <a href="prezentaciok/seminar_20171123_bognar.pdf">(pdf)</a></p></li>
<li><p><b>1.</b> 2017, 11 November: <strong>„Kompakt pulzátorok a fotometriai űrtávcsövek korában – célpontban a fehér törpecsillagok”</strong> (in Hungarian) – a Változócsillag Szakcsoport találkozója a Magyar Csillagászati Egyesület Változócsillag Szakcsoportja (MCSE VCSSZ) és az MTA CSFK Konkoly Thege Miklós Csillagászati Intézet közös szervezésében, Budapest <a href="prezentaciok/kompakt_pulzatorok_bognar_mcse.pdf">(pdf)</a></p></li>
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<!--<p> <a name="ref"><font color="#c4ab6b" size="2"><b>Selected publications:</b></a></font></p>-->
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