Washington photometry of five star clusters in the Large Magellanic Cloud

Aims. We present CCD photometry in the Washington system C and T 1 passbands down to T1 - 22.5 in the fields of NGC 1697, SL 133, NGC 1997, SL 663, and OHSC 28, five mostly unstudied star clusters in the LMC.Methods. Cluster radii were estimated from star counts in appropriate-sized boxes distribute...

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Publicado:	2009
Materias:	Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Clouds Graphic methods Photometers Photometry Stars Galaxies
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v501_n2_p585_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v501_n2_p585_Piatti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v501_n2_p585_Piatti
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spelling	paper:paper_00046361_v501_n2_p585_Piatti2023-06-08T14:27:49Z Washington photometry of five star clusters in the Large Magellanic Cloud Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Clouds Graphic methods Photometers Photometry Stars Galaxies Aims. We present CCD photometry in the Washington system C and T 1 passbands down to T1 - 22.5 in the fields of NGC 1697, SL 133, NGC 1997, SL 663, and OHSC 28, five mostly unstudied star clusters in the LMC.Methods. Cluster radii were estimated from star counts in appropriate-sized boxes distributed throughout the entire observed fields. We perform a detailed analysis of the field star contamination and derive cluster colour-magnitude diagrams (CMDs). Based on the best fits of isochrones computed by the Padova group to the (T1, C - T1) CMDs, the δ (T1) index and the Standard Giant Branch procedure, we derive metallicities and ages for the five clusters. We combine our sample with clusters with ages and metallicities on a similar scale and examine relationships between position in the LMC, age and metallicity. Results. With the exception of NGC 1697 (age = 0.7 Gyr, [Fe/H] = 0.0 dex), the remaining four clusters are of intermediate-age (from 2.2 to 3.0 Gyr) and relatively metal-poor ([Fe/H] = -0.7 dex). The cluster and field age-metallicty realtions show evidence for a metallicity offset but do overlap, particularly on the upper envelope side of the cluster age-metallicity relation.Conclusions. We confirm previous results that clusters younger than -1 Gyr were formed during an outside-in process; this occurred after a burst of cluster formation that took place mainly in the outer disk and peaked at -2 Gyr ago. © 2009 ESO. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v501_n2_p585_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v501_n2_p585_Piatti
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Clouds Graphic methods Photometers Photometry Stars Galaxies
spellingShingle	Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Clouds Graphic methods Photometers Photometry Stars Galaxies Washington photometry of five star clusters in the Large Magellanic Cloud
topic_facet	Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Galaxies: Individual: LMC Galaxies: Star clusters Magellanic Clouds Stars: Hertzsprung-Russell (HR) and C-M diagrams Techniques: Photometric Clouds Graphic methods Photometers Photometry Stars Galaxies
description	Aims. We present CCD photometry in the Washington system C and T 1 passbands down to T1 - 22.5 in the fields of NGC 1697, SL 133, NGC 1997, SL 663, and OHSC 28, five mostly unstudied star clusters in the LMC.Methods. Cluster radii were estimated from star counts in appropriate-sized boxes distributed throughout the entire observed fields. We perform a detailed analysis of the field star contamination and derive cluster colour-magnitude diagrams (CMDs). Based on the best fits of isochrones computed by the Padova group to the (T1, C - T1) CMDs, the δ (T1) index and the Standard Giant Branch procedure, we derive metallicities and ages for the five clusters. We combine our sample with clusters with ages and metallicities on a similar scale and examine relationships between position in the LMC, age and metallicity. Results. With the exception of NGC 1697 (age = 0.7 Gyr, [Fe/H] = 0.0 dex), the remaining four clusters are of intermediate-age (from 2.2 to 3.0 Gyr) and relatively metal-poor ([Fe/H] = -0.7 dex). The cluster and field age-metallicty realtions show evidence for a metallicity offset but do overlap, particularly on the upper envelope side of the cluster age-metallicity relation.Conclusions. We confirm previous results that clusters younger than -1 Gyr were formed during an outside-in process; this occurred after a burst of cluster formation that took place mainly in the outer disk and peaked at -2 Gyr ago. © 2009 ESO.
title	Washington photometry of five star clusters in the Large Magellanic Cloud
title_short	Washington photometry of five star clusters in the Large Magellanic Cloud
title_full	Washington photometry of five star clusters in the Large Magellanic Cloud
title_fullStr	Washington photometry of five star clusters in the Large Magellanic Cloud
title_full_unstemmed	Washington photometry of five star clusters in the Large Magellanic Cloud
title_sort	washington photometry of five star clusters in the large magellanic cloud
publishDate	2009
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v501_n2_p585_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v501_n2_p585_Piatti
_version_	1768545581541621760

Washington photometry of five star clusters in the Large Magellanic Cloud

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