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The distance to the Small Magellanic Cloud from eclipsing binaries

Published online by Cambridge University Press:  26 February 2013

Dariusz Graczyk ,
Grzegorz Pietrzyński ,
Bogumił Pilecki ,
Ian B. Thompson ,
Wolfgang Gieren ,
Piotr Konorski ,
Andrzej Udalski  and
Igor Soszyński
Dariusz Graczyk
Affiliation:
Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile email: darek@astro-udec.cl, bpilecki@astro-udec.cl, wgieren@astro-udec.cl
Grzegorz Pietrzyński
Affiliation:
Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile email: darek@astro-udec.cl, bpilecki@astro-udec.cl, wgieren@astro-udec.cl Obserwatorium Astronomiczne, Uniwersytet Warszawski, Al. Ujazdowskie 4, 00-478 Warszawa, Poland email: pietrzyn@astrouw.edu.pl, piokon@astrouw.edu.pl, udalski@astrouw.edu.pl, soszynsk@astrouw.edu.pl
Bogumił Pilecki
Affiliation:
Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile email: darek@astro-udec.cl, bpilecki@astro-udec.cl, wgieren@astro-udec.cl Obserwatorium Astronomiczne, Uniwersytet Warszawski, Al. Ujazdowskie 4, 00-478 Warszawa, Poland email: pietrzyn@astrouw.edu.pl, piokon@astrouw.edu.pl, udalski@astrouw.edu.pl, soszynsk@astrouw.edu.pl
Ian B. Thompson
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 911101-1292, USA email: ian@obs.carnegiescience.edu
Wolfgang Gieren
Affiliation:
Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile email: darek@astro-udec.cl, bpilecki@astro-udec.cl, wgieren@astro-udec.cl
Piotr Konorski
Affiliation:
Obserwatorium Astronomiczne, Uniwersytet Warszawski, Al. Ujazdowskie 4, 00-478 Warszawa, Poland email: pietrzyn@astrouw.edu.pl, piokon@astrouw.edu.pl, udalski@astrouw.edu.pl, soszynsk@astrouw.edu.pl
Andrzej Udalski
Affiliation:
Obserwatorium Astronomiczne, Uniwersytet Warszawski, Al. Ujazdowskie 4, 00-478 Warszawa, Poland email: pietrzyn@astrouw.edu.pl, piokon@astrouw.edu.pl, udalski@astrouw.edu.pl, soszynsk@astrouw.edu.pl
Igor Soszyński
Affiliation:
Obserwatorium Astronomiczne, Uniwersytet Warszawski, Al. Ujazdowskie 4, 00-478 Warszawa, Poland email: pietrzyn@astrouw.edu.pl, piokon@astrouw.edu.pl, udalski@astrouw.edu.pl, soszynsk@astrouw.edu.pl
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Abstract

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A preliminary distance etimate to SMC 108.1.14904, a long-period eclipsing binary in the Small Magellanic Cloud, is presented. The binary system contains two bright, non-active G-type giants. Its orbital period is 185 days and the orbit is circular. Using surface brightness calibration, we obtain a distance modulus to the system of (m-M)= 19.02 ± 0.04 (statistical) ± 0.05 (systematic) mag, where the systematic error is dominated by uncertainties in the surface brightness calibration. This is a second eclipsing binary in the SMC analysed by our team.

Keywords

binaries: eclipsinggalaxies: distances and redshiftsgalaxies: individual (Small Magellanic Cloud)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 222 - 225
Copyright
Copyright © International Astronomical Union 2013

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