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Eclipsing binaries in local group galaxies: Physical properties of the stars and calibration of the zero-point of the cosmic distance scale

Published online by Cambridge University Press:  12 April 2016

Edward F. Guinan ,
Ignasi Ribas  and
Edward L. Fitzpatrick
Edward F. Guinan
Affiliation:
Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085, USA
Ignasi Ribas
Affiliation:
Departament d’Astronomia i Meteorologia, Universitat de Barcelona, Avenida Diagonal 647, E-08028 Barcelona, Spain
Edward L. Fitzpatrick
Affiliation:
Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085, USA

Abstract

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We report on the progress of the program to study eclipsing binaries (EBs) in the Local Group galaxies. The primary goals of the program are to determine accurate distances and physical properties of the stars, and to probe the structure and evolution of the host galaxies. In particular, the distance to the Large Magellanic Cloud (LMC) is critically important because this nearby galaxy is used to calibrate most of the important cosmic distance indicators such as Cepheid and RR Lyr variables. Over the last several years, we have demonstrated that the distance of the LMC can be reliably measured using selected eclipsing binaries. The combined analyses of the UV/optical spectrophotometry, radial velocities, and light curves yield the stars’ physical properties (mass, radius, Teff, luminosity, metal abundance) and accurate (2–3%) distances. So far, the physical properties and distances of four LMC EBs have been completed and give a distance to the centroid of the LMC of 48.3 ± 1.6 kpc. Several additional EBs in the LMC and the Small Magellanic Cloud have been observed and are being analyzed. Also several LMC EBs have been observed with FUSE (92 – 119 nm) to further refine values of Teff and interstellar absorption. As an extension of these studies, 19–20th mag EBs in M31 are being observed photometrically and spectroscopically. The results of this extragalactic EB program are discussed along with plans to use EBs to study the host galaxy structure.

Type
Part 6. Binary stars and pulsation
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 363 - 371
Copyright
Copyright © Astronomical Society of the Pacific 2004

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