Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482

Aims. We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event that exhibits clear extended-source effects. These events are relatively rare, but they potentially contain unique information on the stellar atmosphere properties of their sourc...

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Detalles Bibliográficos
Autores: Zub, M., Pietrzynski, G.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Chile
Idioma:inglés
OAI Identifier:oai:repositorio.anid.cl:10533/237379
Acceso en línea:https://hdl.handle.net/10533/237379
Access Level:acceso abierto
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spelling Pietrzynski, G.Zub, M.201110.1051/0004-6361/200912007https://hdl.handle.net/10533/237379http://purl.org/coar/access_right/c_abf2Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482Zub, M.Pietrzynski, G.2019-12-18T18:15:21Z2022-07-07T23:40:18Z2019-12-18T18:15:21Z2022-07-07T23:40:18Z2011Aims. We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event that exhibits clear extended-source effects. These events are relatively rare, but they potentially contain unique information on the stellar atmosphere properties of their source star, as shown in this study. Methods. Our dense photometric coverage of the overall light curve and a proper microlensing modelling allow us to derive measurements of the OGLE 2004-BLG-482source star’s linear limb-darkening coefficients in three bands, including standard Johnson-Cousins I and R, as well as in a broad clear filter. In particular, we discuss in detail the problems of multi-band and multi-site modelling on the expected precision of our results. We also obtained high-resolution UVES spectra as part of a ToO programme at ESO VLT, from which we derive the source star’s precise fundamental parameters. Results. From the high-resolution UVES spectra, we find that OGLE 2004-BLG-482’s source star is a red giant of MK type a bit later than M3, with Teff = 3667 ± 150 K, log g = 2.1 ± 1.0 and an assumed solar metallicity. This is confirmed by an OGLE calibrated colour − magnitude diagram. We then obtain from a detailed microlensing modelling of the light curve linear limb-darkening coefficients that we compare to model-atmosphere predictions available in the literature, and find a very good agreement for the I and R bands. In addition, we perform a similar analysis using an alternative description of limb darkening based on a principal component analysis of ATLAS limb-darkening profiles, and also find a very good agreement between measurements and model predictions.FONDAPFONDAP1501000315010003virtual::31773-1WOS:000285193700004https://hdl.handle.net/10533/237379enginstname: Conicytreponame: Repositorio Digital RI2.010.1051/0004-6361/200912007info:eu-repo/grantAgreement/Fondap/15010003https://www.aanda.org/articles/aa/abs/2011/01/aa12007-09/aa12007-09.htmlAtribución-NoComercial-SinDerivadas 3.0 Chilehttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/info:eu-repo/semantics/openAccessLimb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482Astronomy & AstrophysicsArticuloinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttps://hdl.handle.net/10533/237379http://purl.org/coar/resource_type/c_2df8fbb1045fc0e1-ef55-4532-8afe-69fe789d964dvirtual::31773-1045fc0e1-ef55-4532-8afe-69fe789d964dvirtual::31773-110533/237379oai:repositorio.anid.cl:10533/2373792023-07-24 18:33:47.089https://repositorio.anid.clRepositorio ANIDaletelier@anid.cl
dc.title.none.fl_str_mv Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
dc.title.journal.none.fl_str_mv Astronomy & Astrophysics
title Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
spellingShingle Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
Zub, M.
title_short Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
title_full Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
title_fullStr Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
title_full_unstemmed Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
title_sort Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
dc.creator.none.fl_str_mv Zub, M.
Pietrzynski, G.
author Zub, M.
author_facet Zub, M.
Pietrzynski, G.
author_role author
author2 Pietrzynski, G.
author2_role author
description Aims. We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event that exhibits clear extended-source effects. These events are relatively rare, but they potentially contain unique information on the stellar atmosphere properties of their source star, as shown in this study. Methods. Our dense photometric coverage of the overall light curve and a proper microlensing modelling allow us to derive measurements of the OGLE 2004-BLG-482source star’s linear limb-darkening coefficients in three bands, including standard Johnson-Cousins I and R, as well as in a broad clear filter. In particular, we discuss in detail the problems of multi-band and multi-site modelling on the expected precision of our results. We also obtained high-resolution UVES spectra as part of a ToO programme at ESO VLT, from which we derive the source star’s precise fundamental parameters. Results. From the high-resolution UVES spectra, we find that OGLE 2004-BLG-482’s source star is a red giant of MK type a bit later than M3, with Teff = 3667 ± 150 K, log g = 2.1 ± 1.0 and an assumed solar metallicity. This is confirmed by an OGLE calibrated colour − magnitude diagram. We then obtain from a detailed microlensing modelling of the light curve linear limb-darkening coefficients that we compare to model-atmosphere predictions available in the literature, and find a very good agreement for the I and R bands. In addition, we perform a similar analysis using an alternative description of limb darkening based on a principal component analysis of ATLAS limb-darkening profiles, and also find a very good agreement between measurements and model predictions.
publishDate 2011
dc.date.issued.none.fl_str_mv 2011
dc.date.accessioned.none.fl_str_mv 2019-12-18T18:15:21Z
2022-07-07T23:40:18Z
dc.date.available.none.fl_str_mv 2019-12-18T18:15:21Z
2022-07-07T23:40:18Z
dc.type.none.fl_str_mv Articulo
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/article
dc.type.openaire.none.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.folio.none.fl_str_mv 15010003
15010003
dc.identifier.idwos.none.fl_str_mv WOS:000285193700004
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/10533/237379
identifier_str_mv 15010003
WOS:000285193700004
url https://hdl.handle.net/10533/237379
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv instname: Conicyt
reponame: Repositorio Digital RI2.0
dc.relation.doi.none.fl_str_mv 10.1051/0004-6361/200912007
dc.relation.projectid.none.fl_str_mv info:eu-repo/grantAgreement/Fondap/15010003
dc.relation.uri.none.fl_str_mv https://www.aanda.org/articles/aa/abs/2011/01/aa12007-09/aa12007-09.html
dc.rights.none.fl_str_mv Atribución-NoComercial-SinDerivadas 3.0 Chile
http://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rights.driver.none.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial-SinDerivadas 3.0 Chile
http://creativecommons.org/licenses/by-nc-nd/3.0/cl/
eu_rights_str_mv openAccess
repository.name.fl_str_mv Repositorio ANID
repository.mail.fl_str_mv aletelier@anid.cl
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