Physical properties of the eclipsing Delta Sct star KIC 10661783

Abstract

KIC 10661783 is an eclipsing binary that shows Delta Sct-like oscillations. More than 60 pulsation frequencies have been detected in its light curve as observed by the Kepler satellite. We want to determine the fundamental stellar and system parameters of the eclipsing binary as a precondition for asteroseismic modelling of the pulsating component and to establish whether the star is a semi-detached Algol-type system. We measured the radial velocities of both components from new high-resolution spectra using TODCOR and compute the orbit using PHOEBE. We used the KOREL program to decompose the observed spectra into its components, and analysed the decomposed spectra to determine the atmospheric parameters. For this, we developed a new computer program for the normalisation of the KOREL output spectra. Fundamental stellar parameters are determined by combining the spectroscopic results with those from the analysis of the Kepler light curve. We obtain Teff, logg, vsini, and the absolute masses and radii of the components, together with their flux ratio and separation. Whereas the secondary star rotates synchronously with the orbital motion, the primary star rotates subsynchronously by a factor of 0.75. The newly determined mass ratio of 0.0911 is higher than previously thought and means a detached configuration is required to fit the light curve. With its low orbital period and very low mass ratio, the system shows characteristics of the R CMa-type stars but differs from this group by being detached. Its current state is assumed to be that of a detached post-Algol binary system with a pulsating primary component.

13 pages, 8 tables, 17 figures

References in corpus (2)

• The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
• Disentangling telluric lines in stellar spectra

Cited by in corpus (41)

• Catalogue and Properties of δ Scuti Stars in Binaries
• Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
• Observational $\Delta \nu$-$\bar{\rho }$ relation for $\delta$ Sct stars using eclipsing binaries and space photometry
• KIC 3858884: a hybrid δ Sct pulsator in a highly eccentric eclipsing binary
• Systematic search for stellar pulsators in the eclipsing binaries observed by Kepler
• The BANANA project. V. Misaligned and precessing stellar rotation axes in CV Velorum
• Eclipsing binary stars with a $\delta$ Scuti component
• Kepler Eclipsing Binaries with $\delta$ Scuti/$\gamma$ Doradus Pulsating Components 1: KIC 9851944
• Precise surface gravities of $\delta$ Scuti stars from asteroseismology
• KIC 8262223: A Post-Mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor
• Discovery of 36 eclipsing EL CVn binaries found by the Palomar Transient Factory
• HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component
• Absolute Properties of the Pulsating Post-mass Transfer Eclipsing Binary OO Draconis
• The G+M eclipsing binary V530 Orionis: A stringent test of magnetic stellar evolution models for low-mass stars
• Radial Velocities of 41 Kepler Eclipsing Binaries
• Spectroscopic survey of Kepler stars. II. FIES/NOT observations of A- and F-type stars
• KIC 6206751: the first R CMa-type eclipsing binary with $\gamma$ Doradus pulsations
• Fundamental Parameters of Kepler Eclipsing Binaries. I. KIC 5738698
• KIC 6220497: A New Algol-type Eclipsing Binary with Multiperiodic Pulsations
• Modelling of Sigma Scorpii, a high-mass binary with a Beta Cep variable primary component
• KIC 4739791: A New R CMa-type Eclipsing Binary with a Pulsating Component
• The eclipsing binary systems with $\delta$ Scuti component. I. KIC 10661783
• Asteroseismology of binary stars and a compilation of core overshoot and rotational frequency values of OB stars
• KIC 11401845: An Eclipsing Binary with Multiperiodic Pulsations and Light Travel Time
• The Pre-He White Dwarfs in Eclipsing Binaries. I. WASP 0131+28
• KIC 8553788: A pulsating Algol with an extreme mass ratio
• Asteroseismology of Eclipsing Binary Stars in the Kepler Era
• Light curve solutions of 12 eccentric Kepler binaries and analysis of their out-of-eclipse variability
• Asteroseismology of two Kepler detached eclipsing binaries
• Spectroscopic time-series analysis of R Canis Majoris
• OMC/INTEGRAL photometric observations of pulsating components in eclipsing binaries and characterization of DY Aqr
• Binary evolution using the theory of osculating orbits: conservative Algol evolution
• HD 51844: An Am delta Scuti in a binary showing periastron brightening
• Physical properties of the eclipsing binary KIC 9851944 and analysis of its tidally-perturbed p- and g-mode pulsations
• Light Curve Solutions of Ten Eccentric Kepler Binaries, Three of them with Tidally Induced Humps
• KIC 12268220: A $\delta$ Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System
• Light curve solutions of the eclipsing eccentric binaries KIC 8111622, KIC 10518735, KIC 8196180 and their out-of-eclipse variability
• Multiple star systems observed with CoRoT and Kepler (invited review)
• Light curve solutions of the eccentric binaries KIC 10992733, KIC 5632781, KIC 10026136 and their out-of-eclipse variability
• Towards Understanding the Nature of Young Detached Binary System HD 350731
• Spectroscopic long-term monitoring of RZ Cas -- Part I: Basic stellar and system parameters