Precise surface gravities of δ Scuti stars from asteroseismology

DOI: 
10.1093/mnrasl/slx117
Publication date: 
27/10/2017
Main author: 
García Hernández, A.
IAA authors: 
Suárez, J. C.; Pascual-Granado, J.; Martín-Ruiz, S.; Garrido, R.
Authors: 
García Hernández, A.; Suárez, J. C.; Moya, A.; Monteiro, M. J. P. F. G.; Guo, Z.; Reese, D. R.; Pascual-Granado, J.; Barceló Forteza, S.; Martín-Ruiz, S.; Garrido, R.; Nieto, J.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
471
Pages: 
L140-L144
Issue: 
1
Abstract: 
<p>The work reported here demonstrates that it is possible to accurately determine surface gravities of <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;&amp;#x03B4;&lt;/mi&gt;&lt;/math&gt;" id="MathJax-Element-1-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-1" style="width: 0.579em; display: inline-block;"><span style="display: inline-block; position: relative; width: 0.433em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.398em, 1000.43em, 2.414em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-2"><span class="mi" id="MathJax-Span-3" style="font-family: MathJax_Math; font-style: italic;">δ</span></span></span></span></span></nobr></span> Sct stars using the frequency content from high precision photometry and a measurement of the parallax. Using a sample of 10 eclipsing binary systems with a <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;&amp;#x03B4;&lt;/mi&gt;&lt;/math&gt;" id="MathJax-Element-2-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-4" style="width: 0.579em; display: inline-block;"><span style="display: inline-block; position: relative; width: 0.433em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.398em, 1000.43em, 2.414em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-5"><span class="mi" id="MathJax-Span-6" style="font-family: MathJax_Math; font-style: italic;">δ</span></span></span></span></span></nobr></span> Sct component and the unique <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;&amp;#x03B4;&lt;/mi&gt;&lt;/math&gt;" id="MathJax-Element-3-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-7" style="width: 0.579em; display: inline-block;"><span style="display: inline-block; position: relative; width: 0.433em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.398em, 1000.43em, 2.414em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-8"><span class="mi" id="MathJax-Span-9" style="font-family: MathJax_Math; font-style: italic;">δ</span></span></span></span></span></nobr></span> Sct star discovered with a transiting planet, WASP-33, we were able to refine the <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi mathvariant=&quot;normal&quot;&gt;&amp;#x0394;&lt;/mi&gt;&lt;mi&gt;&amp;#x03BD;&lt;/mi&gt;&lt;mo&gt;&amp;#x2212;&lt;/mo&gt;&lt;mrow class=&quot;MJX-TeXAtom-ORD&quot;&gt;&lt;mover&gt;&lt;mi&gt;&amp;#x03C1;&lt;/mi&gt;&lt;mo stretchy=&quot;false&quot;&gt;&amp;#x00AF;&lt;/mo&gt;&lt;/mover&gt;&lt;/mrow&gt;&lt;/math&gt;" id="MathJax-Element-4-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-10" style="width: 4.089em; display: inline-block;"><span style="display: inline-block; position: relative; width: 3.125em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.399em, 1003.05em, 2.62em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-11"><span class="mi" id="MathJax-Span-12" style="font-family: MathJax_Main;">Δ</span><span class="mi" id="MathJax-Span-13" style="font-family: MathJax_Math; font-style: italic;">ν</span><span class="mo" id="MathJax-Span-14" style="font-family: MathJax_Main; padding-left: 0.222em;">−</span><span class="texatom" id="MathJax-Span-15" style="padding-left: 0.222em;"><span class="mrow" id="MathJax-Span-16"><span class="munderover" id="MathJax-Span-17"><span style="display: inline-block; position: relative; width: 0.592em; height: 0px;"><span style="position: absolute; clip: rect(3.404em, 1000.51em, 4.351em, -1000em); top: -3.99em; left: 0em;"><span class="mi" id="MathJax-Span-18" style="font-family: MathJax_Math; font-style: italic;">ρ</span></span><span style="position: absolute; clip: rect(3.256em, 1000.43em, 3.591em, -1000em); top: -4.009em; left: 0.092em;"><span class="mo" id="MathJax-Span-19" style="font-family: MathJax_Main;">¯</span></span></span></span></span></span></span></span></span></span></nobr></span> relation. Using this relation and parallaxes, we obtained independent values for the masses and radii, allowing us to calculate the surface gravities without any constraints from spectroscopic or binary analysis. A remarkably good agreement was found between our results and those published, extracted from the analysis of the radial velocities and light curves of the systems. This reinforces the potential of <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi mathvariant=&quot;normal&quot;&gt;&amp;#x0394;&lt;/mi&gt;&lt;mi&gt;&amp;#x03BD;&lt;/mi&gt;&lt;/math&gt;" id="MathJax-Element-5-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-20" style="width: 1.781em; display: inline-block;"><span style="display: inline-block; position: relative; width: 1.346em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.399em, 1001.35em, 2.406em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-21"><span class="mi" id="MathJax-Span-22" style="font-family: MathJax_Main;">Δ</span><span class="mi" id="MathJax-Span-23" style="font-family: MathJax_Math; font-style: italic;">ν</span></span></span></span></span></nobr></span> as a valuable observable for <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;&amp;#x03B4;&lt;/mi&gt;&lt;/math&gt;" id="MathJax-Element-6-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-24" style="width: 0.579em; display: inline-block;"><span style="display: inline-block; position: relative; width: 0.433em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.398em, 1000.43em, 2.414em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-25"><span class="mi" id="MathJax-Span-26" style="font-family: MathJax_Math; font-style: italic;">δ</span></span></span></span></span></nobr></span> Sct stars and settles the degeneracy problem for the <span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;log&lt;/mi&gt;&lt;mo&gt;&amp;#x2061;&lt;/mo&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/math&gt;" id="MathJax-Element-7-Frame" role="presentation" style="position: relative;" tabindex="0"><nobr><span class="math" id="MathJax-Span-27" style="width: 2.502em; display: inline-block;"><span style="display: inline-block; position: relative; width: 1.923em; height: 0px; font-size: 130%;"><span style="position: absolute; clip: rect(1.421em, 1001.92em, 2.61em, -1000em); top: -2.26em; left: 0em;"><span class="mrow" id="MathJax-Span-28"><span class="mi" id="MathJax-Span-29" style="font-family: MathJax_Main;">log</span><span class="mi" id="MathJax-Span-31" style="font-family: MathJax_Math; font-style: italic; padding-left: 0.167em;">g</span></span></span></span></span></nobr></span></p> <p><span class="MathJax" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;log&lt;/mi&gt;&lt;mo&gt;&amp;#x2061;&lt;/mo&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/math&gt;" role="presentation" style="position: relative;" tabindex="0"><nobr></nobr></span> determination through spectroscopy.</p>
Database: 
WOK
SCOPUS
ADS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032220810&doi=10.1093%2fmnrasl%2fslx117&partnerID=40&md5=4ff8271785d3431120464766bc099597
ADS Bibcode: 
2017MNRAS.471L.140G