The araucaria project. Determination of the large magellanic cloud distance from late-type eclipsing binary systems. I. OGLE-051019.64-685812.3

Grzegorz Pietrzyński, Ian B. Thompson, Dariusz Graczyk, Wolfgang Gieren, Andrzej Udalski, Olaf Szewczyk, Dante Minniti, Zbigniew Kołaczkowski, Fabio Bresolin, Rolf Peter Kudritzki

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

We have analyzed the double-lined eclipsing binary system OGLE-051019.64-685812.3 in the LMC which consists of two G4 giant components with very similar effective temperatures. A detailed analysis of the Optical Gravitational Lensing Experiment I-band light curve of the system, radial velocity curves for both components derived from high-resolution spectra, and near-infrared magnitudes of the binary system measured outside the eclipses has allowed us to obtain an accurate orbit solution for this eclipsing binary and its fundamental physical parameters. Using a surface brightness (V - K)-color relation for giant stars we have calculated the distance to the system and obtained a true distance modulus of 18.50 mag, with an estimated total uncertainty of 3%. More similar eclipsing binary systems in the LMC which we have discovered and for which we are currently obtaining the relevant data will allow us to better check on the systematics of the method and eventually provide a distance determination to the LMC accurate to 1%, much needed for the calibration of the distance scale.

Original languageEnglish
Pages (from-to)862-866
Number of pages5
JournalAstrophysical Journal
Volume697
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • Binaries: eclipsing
  • Binaries: spectroscopic
  • Distance scale
  • Galaxies: distances and redshifts
  • Magellanic Clouds
  • Stars: late-type

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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