The Araucaria Project. Precise physical parameters of the eclipsing binary IO Aqr

Abstract

Our aim is to precisely measure the physical parameters of the eclipsing binary IO Aqr and derive a distance to this system by applying a surface brightness - colour relation. Our motivation is to combine these parameters with future precise distance determinations from the GAIA space mission to derive precise surface brightness - colour relations for stars. We extensively used photometry from the Super-WASP and ASAS projects and precise radial velocities obtained from HARPS and CORALIE high-resolution spectra. We analysed light curves with the code JKTEBOP and radial velocity curves with the Wilson-Devinney program. We found that IO Aqr is a hierarchical triple system consisting of a double-lined short-period (P=2.37 d) spectroscopic binary and a low-luminosity and low-mass companion star orbiting the binary with a period of ~25000 d (~70 yr) on a very eccentric orbit. We derive high-precision (better than 1%) physical parameters of the inner binary, which is composed of two slightly evolved main-sequence stars (F5 V-IV + F6 V-IV) with masses of M1=1.569+/-0.004 and M2=1.655+/-0.004 M_sun and radii R1=2.19+/-0.02 and R2=2.49+/-0.02 R_sun. The companion is most probably a late K-type dwarf with mass ~0.6 M_sun. The distance to the system resulting from applying a (V-K) surface brightness - colour relation is 255+/-6(stat.)+/-6(sys.) pc, which agrees well with the Hipparcos value of 270+/-73 pc, but is more precise by a factor of eight.

Accepted for publication in the Astronomy & Astrophysics Journal

References in corpus (30)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Validation of the new Hipparcos reduction
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Accurate masses and radii of normal stars: modern results and applications
• The WASP Project and the SuperWASP Cameras
• GAIA: Composition, Formation and Evolution of the Galaxy
• Color Transformations for the 2MASS Second Incremental Data Release
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• The effective temperature scale of FGK stars. II. Teff : color : [Fe/H] calibrations
• Correcting systematic effects in a large set of photometric lightcurves
• The angular size of dwarf stars and subgiants - Surface brightness relations calibrated by interferometry
• Three Dimensional Structure of the Milky Way Disk
• The orbit of the star S2 around SgrA* from VLT and Keck data
• A library of high resolution synthetic stellar spectra from 300nm to 1.8 micron with solar and alpha-enhanced composition
• A new implementation of the infrared flux method using the 2MASS catalogue
• Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
• Improved Color-Temperature Relations and Bolometric Corrections for Cool Stars
• The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries
• Effective temperature scale and bolometric corrections from 2MASS photometry
• All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
• Triple-Star Candidates Among the Kepler Binaries
• Eclipsing binaries in open clusters. III. V621 Per in chi Persei
• WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
• Towards stellar effective temperatures and diameters at one per cent accuracy for future surveys
• EL CVn-type binaries - Discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems
• The Catalogue of Stellar Parameters from the Detached Double-Lined Eclipsing Binaries in the Milky Way
• Improving the surface brightness-color relation for early-type stars using optical interferometry
• The Araucaria Project. Accurate stellar parameters and distance to evolved eclipsing binary ASAS J180057-2333.8 in Sagittarius Arm

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• Accurate stellar parameters and distance to two evolved eclipsing binary systems, OGLE-BLG-ECL-123903 and OGLE-BLG-ECL-296596, towards the Galactic bulge
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