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...
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todo:paper_00358711_v397_n2_p1073_Piatti2023-10-03T14:46:53Z NGC 2587: A sparse open cluster projected on to a populous star field Piatti, A.E. Clariá, J.J. Ahumada, A.V. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 |
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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 Piatti, A.E. Clariá, J.J. Ahumada, A.V. 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. |
| format |
JOUR |
| author |
Piatti, A.E. Clariá, J.J. Ahumada, A.V. |
| author_facet |
Piatti, A.E. Clariá, J.J. Ahumada, A.V. |
| author_sort |
Piatti, A.E. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p1073_Piatti |
| work_keys_str_mv |
AT piattiae ngc2587asparseopenclusterprojectedontoapopulousstarfield AT clariajj ngc2587asparseopenclusterprojectedontoapopulousstarfield AT ahumadaav ngc2587asparseopenclusterprojectedontoapopulousstarfield |
| _version_ |
1807322694240174080 |