Eclipsing binaries suitable for distance determination in the Andromeda galaxy

The Local Group galaxies constitute a fundamental step in the definition of cosmic distance scale. Therefore, obtaining accurate distance determinations to the galaxies in the Local Group, and notably to the Andromeda Galaxy (M 31), is essential for determining the age and evolution of the Universe....

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Authors: Vilardell Sallés, Francesc, Ribas Canudas, Ignasi, Jordi i Nebot, Carme
Format: article
Status:Published version
Publication Date:2006
Country:España
Institution:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repository:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/9227
Online Access:https://hdl.handle.net/2445/9227
Access Level:Open access
Keyword:Distàncies extragalàctiques
Fotometria astronòmica
Stars: variables: general
Stars: binaries: eclipsing
Stars: fundamental parameters
Stars: distances
Techniques: photometric
Catalogs
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spelling Eclipsing binaries suitable for distance determination in the Andromeda galaxyVilardell Sallés, FrancescRibas Canudas, IgnasiJordi i Nebot, CarmeDistàncies extragalàctiquesFotometria astronòmicaStars: variables: generalStars: binaries: eclipsingStars: fundamental parametersStars: distancesTechniques: photometricCatalogsThe Local Group galaxies constitute a fundamental step in the definition of cosmic distance scale. Therefore, obtaining accurate distance determinations to the galaxies in the Local Group, and notably to the Andromeda Galaxy (M 31), is essential for determining the age and evolution of the Universe. With this ultimate goal in mind, we started a project of using eclipsing binaries as distance indicators to M 31. Eclipsing binaries have been proved to yield direct and precise distances that are essentially assumption-free. To do so, high-quality photometric and spectroscopic data were needed. As a first step in the project, broad band photometry (in Johnson B and V) was obtained in a region (34' × 34' ) in the north eastern quadrant of the galaxy over 5 years. The data, containing more than 250 observations per filter, were reduced by means of the so-called difference image analysis technique and the DAOPHOT program. A catalog with 236 238 objects with photometry in both B and V passbands was obtained. The catalog is the deepest (V < 25. 5m ag) obtained so far in the studied region and it contains 3964 identified variable stars, with 437 eclipsing binaries and 416 Cepheids. The most suitable eclipsing binary candidates for distance determination were selected according to their brightness and from the modelling of the obtained light curves. The resulting sample includes 24 targets with photometric errors around 0.01 mag. Detailed analysis (including spectroscopy) of some 5−10 of these eclipsing systems should result in a distance determination to M 31 with a relative uncertainty of 2−3% and essentially free of systematic errors, thus representing the most accurate and reliable determination to date.EDP Sciences200920092006info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion11 p.application/pdfhttps://hdl.handle.net/2445/9227Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a http://dx.doi.org/10.1051/0004-6361:20065667Astronomy and Astrophysics Supplement Series, 2006, vol. 459, p. 321-331.http://doi.org/10.1051/0004-6361:20065667(c) The European Southern Observatory, 2006info:eu-repo/semantics/openAccessoai:recercat.cat:2445/92272026-05-29T05:05:01Z
dc.title.none.fl_str_mv Eclipsing binaries suitable for distance determination in the Andromeda galaxy
title Eclipsing binaries suitable for distance determination in the Andromeda galaxy
spellingShingle Eclipsing binaries suitable for distance determination in the Andromeda galaxy
Vilardell Sallés, Francesc
Distàncies extragalàctiques
Fotometria astronòmica
Stars: variables: general
Stars: binaries: eclipsing
Stars: fundamental parameters
Stars: distances
Techniques: photometric
Catalogs
title_short Eclipsing binaries suitable for distance determination in the Andromeda galaxy
title_full Eclipsing binaries suitable for distance determination in the Andromeda galaxy
title_fullStr Eclipsing binaries suitable for distance determination in the Andromeda galaxy
title_full_unstemmed Eclipsing binaries suitable for distance determination in the Andromeda galaxy
title_sort Eclipsing binaries suitable for distance determination in the Andromeda galaxy
dc.creator.none.fl_str_mv Vilardell Sallés, Francesc
Ribas Canudas, Ignasi
Jordi i Nebot, Carme
author Vilardell Sallés, Francesc
author_facet Vilardell Sallés, Francesc
Ribas Canudas, Ignasi
Jordi i Nebot, Carme
author_role author
author2 Ribas Canudas, Ignasi
Jordi i Nebot, Carme
author2_role author
author
dc.subject.none.fl_str_mv Distàncies extragalàctiques
Fotometria astronòmica
Stars: variables: general
Stars: binaries: eclipsing
Stars: fundamental parameters
Stars: distances
Techniques: photometric
Catalogs
topic Distàncies extragalàctiques
Fotometria astronòmica
Stars: variables: general
Stars: binaries: eclipsing
Stars: fundamental parameters
Stars: distances
Techniques: photometric
Catalogs
description The Local Group galaxies constitute a fundamental step in the definition of cosmic distance scale. Therefore, obtaining accurate distance determinations to the galaxies in the Local Group, and notably to the Andromeda Galaxy (M 31), is essential for determining the age and evolution of the Universe. With this ultimate goal in mind, we started a project of using eclipsing binaries as distance indicators to M 31. Eclipsing binaries have been proved to yield direct and precise distances that are essentially assumption-free. To do so, high-quality photometric and spectroscopic data were needed. As a first step in the project, broad band photometry (in Johnson B and V) was obtained in a region (34' × 34' ) in the north eastern quadrant of the galaxy over 5 years. The data, containing more than 250 observations per filter, were reduced by means of the so-called difference image analysis technique and the DAOPHOT program. A catalog with 236 238 objects with photometry in both B and V passbands was obtained. The catalog is the deepest (V < 25. 5m ag) obtained so far in the studied region and it contains 3964 identified variable stars, with 437 eclipsing binaries and 416 Cepheids. The most suitable eclipsing binary candidates for distance determination were selected according to their brightness and from the modelling of the obtained light curves. The resulting sample includes 24 targets with photometric errors around 0.01 mag. Detailed analysis (including spectroscopy) of some 5−10 of these eclipsing systems should result in a distance determination to M 31 with a relative uncertainty of 2−3% and essentially free of systematic errors, thus representing the most accurate and reliable determination to date.
publishDate 2006
dc.date.none.fl_str_mv 2006
2009
2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/9227
url https://hdl.handle.net/2445/9227
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a http://dx.doi.org/10.1051/0004-6361:20065667
Astronomy and Astrophysics Supplement Series, 2006, vol. 459, p. 321-331.
http://doi.org/10.1051/0004-6361:20065667
dc.rights.none.fl_str_mv (c) The European Southern Observatory, 2006
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory, 2006
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 11 p.
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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