The araucaria project. An accurate distance to the late-type double-lined eclipsing binary ogle smc113.3 4007 in the small magellanic cloud
We have analyzed the long period, double-lined eclipsing binary system OGLE SMC113.3 4007 (SC10 137844) in the SMC. The binary lies in the north-eastern part of the galaxy and consists of two evolved, well detached, non-active G8 giants. The orbit is eccentric with e = 0.311 and the orbital period i...
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| creator | Graczyk, Dariusz Pietrzynski, Grzegorz Thompson, Ian B Gieren, Wolfgang Pilecki, Bogumil Udalski, Andrzej Soszynski, Igor Kolaczkowski, Zbigniew Rolf-Peter Kudritzki Bresolin, Fabio Konorski, Piotr Mennickent, Ronald Minniti, Dante Storm, Jesper Nardetto, Nicolas Karczmarek, Paulina |
| description | We have analyzed the long period, double-lined eclipsing binary system OGLE SMC113.3 4007 (SC10 137844) in the SMC. The binary lies in the north-eastern part of the galaxy and consists of two evolved, well detached, non-active G8 giants. The orbit is eccentric with e = 0.311 and the orbital period is 371.6 days. Using extensive high-resolution spectroscopic and multi-color photometric data we have determined a true distance modulus of the system of m-M=18.83 +/- 0.02 (statistical) +/- 0.05 (systematic) mag using a surface brightness - color relation for giant stars. This method is very insensitive to metallicity and reddening corrections and depends only very little on stellar atmosphere model assumptions. Additionally, we derived very accurate, at the level of 1%-2%, physical parameters of both giant stars, particularly their masses and radii, making our results important for comparison with stellar evolution models. Our analysis underlines the high potential of late-type, double-lined detached binary systems for accurate distance determinations to nearby galaxies. |
| doi_str_mv | 10.48550/arxiv.1203.2517 |
| format | Article |
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An accurate distance to the late-type double-lined eclipsing binary ogle smc113.3 4007 in the small magellanic cloud</title><title>arXiv.org</title><description>We have analyzed the long period, double-lined eclipsing binary system OGLE SMC113.3 4007 (SC10 137844) in the SMC. The binary lies in the north-eastern part of the galaxy and consists of two evolved, well detached, non-active G8 giants. The orbit is eccentric with e = 0.311 and the orbital period is 371.6 days. Using extensive high-resolution spectroscopic and multi-color photometric data we have determined a true distance modulus of the system of m-M=18.83 +/- 0.02 (statistical) +/- 0.05 (systematic) mag using a surface brightness - color relation for giant stars. This method is very insensitive to metallicity and reddening corrections and depends only very little on stellar atmosphere model assumptions. 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| subjects | Astronomical models Atmospheric models Binary stars Color Eccentric orbits Galactic evolution Galaxies Giant stars Magellanic clouds Metallicity Photometry Physical properties Physics - Cosmology and Nongalactic Astrophysics Physics - Solar and Stellar Astrophysics Stellar evolution Surface brightness |
| title | The araucaria project. An accurate distance to the late-type double-lined eclipsing binary ogle smc113.3 4007 in the small magellanic cloud |
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