Analysis of KIC 7023917: Spotted low-mass ratio eclipsing binary with δ Scuti pulsations
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00598986" target="_blank" >RIV/67985815:_____/24:00598986 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0356556" target="_blank" >https://hdl.handle.net/11104/0356556</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-3881/ad6dd3" target="_blank" >10.3847/1538-3881/ad6dd3</a>
Alternative languages
Result language
angličtina
Original language name
Analysis of KIC 7023917: Spotted low-mass ratio eclipsing binary with δ Scuti pulsations
Original language description
Times of minima of eclipsing binary KIC 7023917 show quasiperiodic anti-symmetric deviations from the calculated one with an amplitude of up to 10 minutes and a period of 200-300 days. These changes correlate with the observed variations of the light-curve maxima (amplitude and phase separation). We used photometric data obtained by Kepler and TESS missions to analyze the times of minima and determine system parameters. The phases and amplitudes of the maxima were measured to study the O'Connell effect. As an additional source of information, we performed ground-based multicolor photometric observation and determined the radial velocities of the system from our spectroscopic measurements. We could explain long-term variations of the light-curve shape and times of the eclipses using the cold star spot located on the secondary component and the modification of its size. Based on our modelling, the system consists of a primary main-sequence star of spectral type A7 and an evolved, oversized secondary component with a mass ratio of only 0.1 due to past mass transfer. Calculation of absolute parameters gives us the mass of the primary component about 1.8 M-circle dot and 0.2 M-circle dot for the secondary one, and radii of 2.2 R-circle dot of the primary star and 0.9 R-circle dot of secondary one, respectively. The studied low-mass ratio eclipsing binary is probably a progenitor of the variable star of EL CVn type. A multiple-period photometric variability was disclosed in the TESS data ranging from half to two hours due to delta Scuti-type pulsations of the primary component.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/LTT20015" target="_blank" >LTT20015: PLATOSpec ground based support of space missions PLATO and TESS - new Czech spectrograph in collaboration with European Southern Observatory</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomical Journal
ISSN
0004-6256
e-ISSN
1538-3881
Volume of the periodical
168
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
171
UT code for WoS article
001318992000001
EID of the result in the Scopus database
2-s2.0-85205365547