OMC/INTEGRAL photometric observations of pulsating components in eclipsing binaries and characterization of DY Aqr

Abstract

We present the search for eclipsing binaries with a pulsating component in the first catalogue of optically variable sources observed by OMC/INTEGRAL, which contains photometric data for more than 1000 eclipsing binaries. Five objects were found and a detailed analysis of one of them, DY Aqr, has been performed. Photometric and spectroscopic observations of DY Aqr were obtained to analyse the binary system and the pulsational characteristics of the primary component. By applying the binary modelling software phoebe to the OMC and ground-based photometric light curves, and to the radial velocity curve obtained using echelle high-resolution spectroscopy, the physical parameters of the system have been determined. Frequency analysis of the residual data has been performed using Fourier techniques to identify pulsational frequencies. We have built a grid of theoretical models to classify spectroscopically the primary component as an A7.5V star (plus or minus one spectral subtype). The best orbital fit was obtained for a semi-detached system configuration. According to the binary modelling, the primary component has Teff = 7625+-125 K and log g = 4.1+-0.1 and the secondary component has Teff = 3800+-200 K and log g = 3.3+-0.1, although it is too faint to isolate its spectral features. From the analysis of the residuals we have found a main pulsation frequency at 23.37 c/d, which is typical of a delta Scuti star. In the O-C diagram no evidence of orbital period changes over the last 8 years has been found.

arXiv comment12 pages, 10 figures. Accepted for publication in MNRAS

References in corpus (19)

• Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• The High Angular Resolution Multiplicity of Massive Stars
• Asteroseismology of Solar-Type and Red-Giant Stars
• Kepler Eclipsing Binary Stars. I. Catalog and Principal Characterization of 1879 Eclipsing Binaries in the First Data Release
• HERMES: a high-resolution fibre-fed spectrograph for the Mercator telescope
• Kepler Asteroseismology Program: Introduction and First Results
• A spectroscopic survey on the multiplicity of high-mass stars
• SigSpec - I. Frequency- and Phase-Resolved Significance in Fourier Space
• KIC 4544587: an Eccentric, Short Period Binary System with delta Sct Pulsations and Tidally Excited Modes
• The first INTEGRAL-OMC catalogue of optically variable sources
• Discovery and analysis of p-mode and g-mode oscillations in the A-type primary of the eccentric binary HD 209295
• KIC 3858884: a hybrid δ Sct pulsator in a highly eccentric eclipsing binary
• Survey for δ Sct components in eclipsing binaries and new correlations between pulsation frequency and fundamental stellar characteristics
• Physical properties of the eclipsing Delta Sct star KIC 10661783
• CoRoT 105906206: a short-period and totally eclipsing binary with a Delta Scuti type pulsator
• The data mining III: An analysis of 21 eclipsing binary light-curves observed by the INTEGRAL/OMC
• In search of RR Lyrae type stars in eclipsing binary systems. OGLE052218.07-692827.4: an optical blend
• Statistical Study of 2XMMi-DR3/SDSS-DR8 Cross-correlation Sample

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• Spectroscopic confirmation of the binary nature of the hybrid pulsator KIC 5709664 found with the frequency modulation method
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