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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/42500
Ver los metadatos del registro completo
id |
CONICETDig_721a2dbd9ff3274009d4f5f04d9fa443 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/42500 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
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 |
_version_ |
1844614273778581504 |
score |
13.070432 |