Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1

Autores
Carraro, Giovanni; Silva, Joao Victor Sales; Bidin, Christian Moni; Vazquez, Ruben Angel
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We employ optical photometry and high-resolution spectroscopy to study a field toward the open cluster Tombaugh 1, where we identify a complex population mixture that we describe in terms of young and old Galactic thin disks. Of particular interest is the spatial distribution of the young population, which consists of dwarfs with spectral types as early as B6 and is distributed in a blue plume feature in the color–magnitude diagram. For the first time, we confirm spectroscopically that most of these stars are early-type stars and not blue stragglers or halo/ thick-disk subdwarfs. Moreover, they are not evenly distributed along the line of sight but crowd at heliocentric distances between 6.6 and 8.2 kpc. We compare these results with present-day understanding of the spiral structure of the Galaxy and suggest that they trace the outer arm. This range of distances challenges current Galactic models adopting a disk cutoff at 14 kpc from the Galactic center. The young dwarfs overlap in space with an older component, which is identified as an old Galactic thin disk. Both young and old populations are confined in space since the disk is warped at the latitude and longitude of Tombaugh 1. The main effects of the warp are that the line of sight intersects the disk and entirely crosses it at the outer arm distance and that there are no traces of the closer Perseus arm, which would then be either unimportant in this sector or located much closer to the formal Galactic plane. Finally, we analyze a group of giant stars, which turn out to be located at very different distances and to possess very different chemical properties, with no obvious relation to the other populations
Fil: Carraro, Giovanni. Universitá di Padova Vicolo Osservatorio; Italia
Fil: Silva, Joao Victor Sales. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil
Fil: Bidin, Christian Moni. Universidad Catolica del Norte; Chile
Fil: Vazquez, Ruben Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Materia
Galaxy
Galactic Disk
Hertzsprung–Russell Diagrams
C–M Diagrams
Open Clusters
Associations
Abundances
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/42500

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network_name_str CONICET Digital (CONICET)
spelling Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1Carraro, GiovanniSilva, Joao Victor SalesBidin, Christian MoniVazquez, Ruben AngelGalaxyGalactic DiskHertzsprung–Russell DiagramsC–M DiagramsOpen ClustersAssociationsAbundanceshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We employ optical photometry and high-resolution spectroscopy to study a field toward the open cluster Tombaugh 1, where we identify a complex population mixture that we describe in terms of young and old Galactic thin disks. Of particular interest is the spatial distribution of the young population, which consists of dwarfs with spectral types as early as B6 and is distributed in a blue plume feature in the color–magnitude diagram. For the first time, we confirm spectroscopically that most of these stars are early-type stars and not blue stragglers or halo/ thick-disk subdwarfs. Moreover, they are not evenly distributed along the line of sight but crowd at heliocentric distances between 6.6 and 8.2 kpc. We compare these results with present-day understanding of the spiral structure of the Galaxy and suggest that they trace the outer arm. This range of distances challenges current Galactic models adopting a disk cutoff at 14 kpc from the Galactic center. The young dwarfs overlap in space with an older component, which is identified as an old Galactic thin disk. Both young and old populations are confined in space since the disk is warped at the latitude and longitude of Tombaugh 1. The main effects of the warp are that the line of sight intersects the disk and entirely crosses it at the outer arm distance and that there are no traces of the closer Perseus arm, which would then be either unimportant in this sector or located much closer to the formal Galactic plane. Finally, we analyze a group of giant stars, which turn out to be located at very different distances and to possess very different chemical properties, with no obvious relation to the other populationsFil: Carraro, Giovanni. Universitá di Padova Vicolo Osservatorio; ItaliaFil: Silva, Joao Victor Sales. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; BrasilFil: Bidin, Christian Moni. Universidad Catolica del Norte; ChileFil: Vazquez, Ruben Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaIOP Publishing2017-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/zipapplication/pdfhttp://hdl.handle.net/11336/42500Carraro, Giovanni; Silva, Joao Victor Sales; Bidin, Christian Moni; Vazquez, Ruben Angel; Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1; IOP Publishing; The Astronomical Journal; 153; 3; 4-2017; 99-1190004-6256CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/153/3/99info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/1538-3881/153/3/99/metainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:27:10Zoai:ri.conicet.gov.ar:11336/42500instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:27:10.373CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
title Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
spellingShingle Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
Carraro, Giovanni
Galaxy
Galactic Disk
Hertzsprung–Russell Diagrams
C–M Diagrams
Open Clusters
Associations
Abundances
title_short Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
title_full Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
title_fullStr Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
title_full_unstemmed Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
title_sort Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1
dc.creator.none.fl_str_mv Carraro, Giovanni
Silva, Joao Victor Sales
Bidin, Christian Moni
Vazquez, Ruben Angel
author Carraro, Giovanni
author_facet Carraro, Giovanni
Silva, Joao Victor Sales
Bidin, Christian Moni
Vazquez, Ruben Angel
author_role author
author2 Silva, Joao Victor Sales
Bidin, Christian Moni
Vazquez, Ruben Angel
author2_role author
author
author
dc.subject.none.fl_str_mv Galaxy
Galactic Disk
Hertzsprung–Russell Diagrams
C–M Diagrams
Open Clusters
Associations
Abundances
topic Galaxy
Galactic Disk
Hertzsprung–Russell Diagrams
C–M Diagrams
Open Clusters
Associations
Abundances
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We employ optical photometry and high-resolution spectroscopy to study a field toward the open cluster Tombaugh 1, where we identify a complex population mixture that we describe in terms of young and old Galactic thin disks. Of particular interest is the spatial distribution of the young population, which consists of dwarfs with spectral types as early as B6 and is distributed in a blue plume feature in the color–magnitude diagram. For the first time, we confirm spectroscopically that most of these stars are early-type stars and not blue stragglers or halo/ thick-disk subdwarfs. Moreover, they are not evenly distributed along the line of sight but crowd at heliocentric distances between 6.6 and 8.2 kpc. We compare these results with present-day understanding of the spiral structure of the Galaxy and suggest that they trace the outer arm. This range of distances challenges current Galactic models adopting a disk cutoff at 14 kpc from the Galactic center. The young dwarfs overlap in space with an older component, which is identified as an old Galactic thin disk. Both young and old populations are confined in space since the disk is warped at the latitude and longitude of Tombaugh 1. The main effects of the warp are that the line of sight intersects the disk and entirely crosses it at the outer arm distance and that there are no traces of the closer Perseus arm, which would then be either unimportant in this sector or located much closer to the formal Galactic plane. Finally, we analyze a group of giant stars, which turn out to be located at very different distances and to possess very different chemical properties, with no obvious relation to the other populations
Fil: Carraro, Giovanni. Universitá di Padova Vicolo Osservatorio; Italia
Fil: Silva, Joao Victor Sales. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil
Fil: Bidin, Christian Moni. Universidad Catolica del Norte; Chile
Fil: Vazquez, Ruben Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
description We employ optical photometry and high-resolution spectroscopy to study a field toward the open cluster Tombaugh 1, where we identify a complex population mixture that we describe in terms of young and old Galactic thin disks. Of particular interest is the spatial distribution of the young population, which consists of dwarfs with spectral types as early as B6 and is distributed in a blue plume feature in the color–magnitude diagram. For the first time, we confirm spectroscopically that most of these stars are early-type stars and not blue stragglers or halo/ thick-disk subdwarfs. Moreover, they are not evenly distributed along the line of sight but crowd at heliocentric distances between 6.6 and 8.2 kpc. We compare these results with present-day understanding of the spiral structure of the Galaxy and suggest that they trace the outer arm. This range of distances challenges current Galactic models adopting a disk cutoff at 14 kpc from the Galactic center. The young dwarfs overlap in space with an older component, which is identified as an old Galactic thin disk. Both young and old populations are confined in space since the disk is warped at the latitude and longitude of Tombaugh 1. The main effects of the warp are that the line of sight intersects the disk and entirely crosses it at the outer arm distance and that there are no traces of the closer Perseus arm, which would then be either unimportant in this sector or located much closer to the formal Galactic plane. Finally, we analyze a group of giant stars, which turn out to be located at very different distances and to possess very different chemical properties, with no obvious relation to the other populations
publishDate 2017
dc.date.none.fl_str_mv 2017-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/42500
Carraro, Giovanni; Silva, Joao Victor Sales; Bidin, Christian Moni; Vazquez, Ruben Angel; Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1; IOP Publishing; The Astronomical Journal; 153; 3; 4-2017; 99-119
0004-6256
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42500
identifier_str_mv Carraro, Giovanni; Silva, Joao Victor Sales; Bidin, Christian Moni; Vazquez, Ruben Angel; Galactic structure in the outer disk: the field in the line of sight to the intermediate-age op en cluster Tombaugh 1; IOP Publishing; The Astronomical Journal; 153; 3; 4-2017; 99-119
0004-6256
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/153/3/99
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/1538-3881/153/3/99/meta
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/zip
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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