Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk

We perform a detailed photometric study of the stellar populations in a Galactic field at l = 232°, b = -6° in the Canis Major (CMa) constellation. We present the first U, B, V, I photometry of the old open cluster Auner 1 and determine it to be ≈3.25 Gyr old and to lie 8.9 kpc from the Sun. In the...

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Detalles Bibliográficos
Autores principales: Carraro, Giovanni, Moitinho, André, Zoccali, Manuela, Vázquez, Rubén Ángel, Baume, Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Astronómicas
Galaxy: general
Hertzsprung-Russell diagram
Open clusters and associations: general
Open clusters and associations: individual (Auner 1)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83126
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83126
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxy: general
Hertzsprung-Russell diagram
Open clusters and associations: general
Open clusters and associations: individual (Auner 1)
spellingShingle Ciencias Astronómicas
Galaxy: general
Hertzsprung-Russell diagram
Open clusters and associations: general
Open clusters and associations: individual (Auner 1)
Carraro, Giovanni
Moitinho, André
Zoccali, Manuela
Vázquez, Rubén Ángel
Baume, Gustavo
Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk
topic_facet Ciencias Astronómicas
Galaxy: general
Hertzsprung-Russell diagram
Open clusters and associations: general
Open clusters and associations: individual (Auner 1)
description We perform a detailed photometric study of the stellar populations in a Galactic field at l = 232°, b = -6° in the Canis Major (CMa) constellation. We present the first U, B, V, I photometry of the old open cluster Auner 1 and determine it to be ≈3.25 Gyr old and to lie 8.9 kpc from the Sun. In the background of the cluster, at more than 9 kpc, we detect a young population most likely associated with the Norma-Cygnus spiral arm. Furthermore, we detect the signature of an older population and identify its turnoff and red giant branch. This population is found to have a mean age of 7 Gyr and a mean metallicity of Z = 0.006. We reconstruct the geometry of the stellar distribution and argue that this older population, often associated with the CMa "galaxy," in fact belongs to the warped old thin- and thick-disk components along this line of sight.
format Articulo
Articulo
author Carraro, Giovanni
Moitinho, André
Zoccali, Manuela
Vázquez, Rubén Ángel
Baume, Gustavo
author_facet Carraro, Giovanni
Moitinho, André
Zoccali, Manuela
Vázquez, Rubén Ángel
Baume, Gustavo
author_sort Carraro, Giovanni
title Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk
title_short Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk
title_full Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk
title_fullStr Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk
title_full_unstemmed Photometry of a galactic field at l = 232°. b = -6°: The old open cluster Auner 1, The Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk
title_sort photometry of a galactic field at l = 232°. b = -6°: the old open cluster auner 1, the norma-cygnus spiral arm, and the signature of the warped galactic thick disk
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/83126
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