NGC 2587: A sparse open cluster projected on to a populous star field

We present CCD photometry in the Johnson U, B and V and Kron-Cousins I passbands for the open cluster NGC 2587. The sample consists of 4406 stars reaching down to V ∼ 21.0. We developed a new method to clean statistically the colour-magnitude diagrams. NGC 2587 appears to be a sparse, relatively bri...

Descripción completa

Guardado en:

Detalles Bibliográficos
Publicado:	2009
Materias:	Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: (NGC 2587) Techniques: photometric
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v397_n2_p1073_Piatti http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p1073_Piatti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00358711_v397_n2_p1073_Piatti
record_format	dspace
spelling	paper:paper_00358711_v397_n2_p1073_Piatti2023-06-08T15:01:27Z NGC 2587: A sparse open cluster projected on to a populous star field Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: (NGC 2587) Techniques: photometric We present CCD photometry in the Johnson U, B and V and Kron-Cousins I passbands for the open cluster NGC 2587. The sample consists of 4406 stars reaching down to V ∼ 21.0. We developed a new method to clean statistically the colour-magnitude diagrams. NGC 2587 appears to be a sparse, relatively bright open cluster, with a few tens of members projected on to a populous star field. The comparatively bright F7/8 II type star HD 70927, located close to the cluster centre, seems not to be a member. Our analysis suggests that NGC 2587 is slightly younger than the Hyades and probably of solar metallicity. A cluster radius of roughly 8 arcmin was estimated from the radial stellar density profile. From 18 probable cluster members with measured proper motions, we derive the following mean values for NGC 2587: μα = -4.3 ± 3.6 mas yr-1 and μδ = -2.5 ± 3.4 mas yr-1. Adopting the theoretical metal content Z = 0.02, which provides the best global fit, we derive a cluster age of 500+60 -50. Simultaneously, colour excesses E(B - V) = 0.10 and E(V - I) = 0.15 and an apparent distance modulus of V - MV = 12.50 are obtained. The interstellar extinction in the cluster direction is found to follow the normal law. NGC 2587 is located at a distance of (2.70 ± 0.70) kpc from the Sun and ∼9.8 kpc from the Galactic centre. © 2009 RAS. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v397_n2_p1073_Piatti http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p1073_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	Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: (NGC 2587) Techniques: photometric
spellingShingle	Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: (NGC 2587) Techniques: photometric NGC 2587: A sparse open cluster projected on to a populous star field
topic_facet	Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: (NGC 2587) Techniques: photometric
description	We present CCD photometry in the Johnson U, B and V and Kron-Cousins I passbands for the open cluster NGC 2587. The sample consists of 4406 stars reaching down to V ∼ 21.0. We developed a new method to clean statistically the colour-magnitude diagrams. NGC 2587 appears to be a sparse, relatively bright open cluster, with a few tens of members projected on to a populous star field. The comparatively bright F7/8 II type star HD 70927, located close to the cluster centre, seems not to be a member. Our analysis suggests that NGC 2587 is slightly younger than the Hyades and probably of solar metallicity. A cluster radius of roughly 8 arcmin was estimated from the radial stellar density profile. From 18 probable cluster members with measured proper motions, we derive the following mean values for NGC 2587: μα = -4.3 ± 3.6 mas yr-1 and μδ = -2.5 ± 3.4 mas yr-1. Adopting the theoretical metal content Z = 0.02, which provides the best global fit, we derive a cluster age of 500+60 -50. Simultaneously, colour excesses E(B - V) = 0.10 and E(V - I) = 0.15 and an apparent distance modulus of V - MV = 12.50 are obtained. The interstellar extinction in the cluster direction is found to follow the normal law. NGC 2587 is located at a distance of (2.70 ± 0.70) kpc from the Sun and ∼9.8 kpc from the Galactic centre. © 2009 RAS.
title	NGC 2587: A sparse open cluster projected on to a populous star field
title_short	NGC 2587: A sparse open cluster projected on to a populous star field
title_full	NGC 2587: A sparse open cluster projected on to a populous star field
title_fullStr	NGC 2587: A sparse open cluster projected on to a populous star field
title_full_unstemmed	NGC 2587: A sparse open cluster projected on to a populous star field
title_sort	ngc 2587: a sparse open cluster projected on to a populous star field
publishDate	2009
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v397_n2_p1073_Piatti http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p1073_Piatti
_version_	1768544309735325696

NGC 2587: A sparse open cluster projected on to a populous star field

Ejemplares similares