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

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dc.creatorCarraro, Giovanni
dc.creatorMoitinho, Andre'
dc.creatorZoccali, Manuela
dc.creatorVazquez, Ruben
dc.creatorBaume, Gustavo
dc.date2006-10-20
dc.date.accessioned2026-07-07T11:26:13Z
dc.date.available2026-07-07T11:26:13Z
dc.descriptionWe 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 Auner1 and determine it to be 3.25 Gyr old and to lie at 8.9 kpc from the Sun. In the background of the cluster, at more than 9 kpc, we detect a young population most probably associated to the Norma Cygnus spiral arm. Furthermore, we detect the signature of an older population and identify its Turn Off and Red Giant Branch. This population is found to have a mean age of 7 Gyrs and a mean metallicity of Z = 0.006 . We reconstruct the geometry of the stellar distribution and argue that this older population - often associated to the Canis Major {\it galaxy}- belongs in fact to the warped old thin/thick disk component along this line of sight.
dc.description19 pages, 7 eps figures (some degraded), accepted for publication in the Astronomical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0610617
dc.identifierhttp://arxiv.org/abs/astro-ph/0610617
dc.identifierAstron.J.133:1058-1066,2007
dc.identifierdoi:10.1086/510331
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195753
dc.subjectAstrophysics
dc.titlePhotometry 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
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