The relatively young, metal-poor and distant open cluster NGC 2324

We have obtained CCD photometry in the Johnson V, Kron-Cousins I and CT1 Washington systems for NGC 2324, a rich open cluster located ∼35° from the Galactic anticentre direction. We measured V magnitudes and V - I colours for 2865 stars and T1 magnitudes and C - T 1 colours for 1815 stars in an area...

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Publicado:	2004
Materias:	Galaxy: general Galaxy: open clusters and associations: individual: NGC 2324 Techniques: photometric Astrophysics Charge coupled devices Cosmic rays Galaxies Light absorption Photometry Galactic disc Isochrone fitting procedures Open clusters and association Astronomy
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v418_n3_p979_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v418_n3_p979_Piatti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v418_n3_p979_Piatti
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spelling	paper:paper_00046361_v418_n3_p979_Piatti2023-06-08T14:27:34Z The relatively young, metal-poor and distant open cluster NGC 2324 Galaxy: general Galaxy: open clusters and associations: individual: NGC 2324 Techniques: photometric Astrophysics Charge coupled devices Cosmic rays Galaxies Light absorption Photometry Galactic disc Isochrone fitting procedures Open clusters and association Astronomy We have obtained CCD photometry in the Johnson V, Kron-Cousins I and CT1 Washington systems for NGC 2324, a rich open cluster located ∼35° from the Galactic anticentre direction. We measured V magnitudes and V - I colours for 2865 stars and T1 magnitudes and C - T 1 colours for 1815 stars in an area of 13′.6 × 13′.6. The comparison of the cluster colour-magnitude diagrams with isochrones of the Geneva group yield E(V - 1) = 0.33 ± 0.07 and V - Mv = 13.70 ± 0.15 for log t = 8.65 (t = 440 Myr) and Z = 0.008 ([Fe/H] = -0.40), and E(C - T1) = 0.40 ± 0.10 and T 1 - MT1 = 13.65 ± 0.15 for the same age and metallicity level. The resulting E(V - I) reddening value implies E(B - V) = 0.25 ± 0.05 and a distance from the Sun of (3.8 ± 0.5) kpc. Star counts carried out within and outside the cluster region allowed us to estimate the cluster angular radius as 5′.3 ± 0′.3 (5.9 pc). When using the E(B - V) reddening value here derived and the original Washington photometric data of Geisler et al. (1991) for the stars confirmed as red cluster giants from Coravel radial velocities, we found [Fe/H] = -0.31 ± 0.04, which is in good agreement with the best fits of isochrones. Therefore, NGC 2324 is found to be a relatively young, metal-poor and distant open cluster located beyond the Perseus spiral arm. A comparison of NGC 2324 with 10 well-known open clusters of nearly the same age shows that the cluster metal abundance and its position in the Galaxy are consistent with the existence of a radial abundance gradient of -0.07 dex kpc-1 in the Galactic disc. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v418_n3_p979_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v418_n3_p979_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: general Galaxy: open clusters and associations: individual: NGC 2324 Techniques: photometric Astrophysics Charge coupled devices Cosmic rays Galaxies Light absorption Photometry Galactic disc Isochrone fitting procedures Open clusters and association Astronomy
spellingShingle	Galaxy: general Galaxy: open clusters and associations: individual: NGC 2324 Techniques: photometric Astrophysics Charge coupled devices Cosmic rays Galaxies Light absorption Photometry Galactic disc Isochrone fitting procedures Open clusters and association Astronomy The relatively young, metal-poor and distant open cluster NGC 2324
topic_facet	Galaxy: general Galaxy: open clusters and associations: individual: NGC 2324 Techniques: photometric Astrophysics Charge coupled devices Cosmic rays Galaxies Light absorption Photometry Galactic disc Isochrone fitting procedures Open clusters and association Astronomy
description	We have obtained CCD photometry in the Johnson V, Kron-Cousins I and CT1 Washington systems for NGC 2324, a rich open cluster located ∼35° from the Galactic anticentre direction. We measured V magnitudes and V - I colours for 2865 stars and T1 magnitudes and C - T 1 colours for 1815 stars in an area of 13′.6 × 13′.6. The comparison of the cluster colour-magnitude diagrams with isochrones of the Geneva group yield E(V - 1) = 0.33 ± 0.07 and V - Mv = 13.70 ± 0.15 for log t = 8.65 (t = 440 Myr) and Z = 0.008 ([Fe/H] = -0.40), and E(C - T1) = 0.40 ± 0.10 and T 1 - MT1 = 13.65 ± 0.15 for the same age and metallicity level. The resulting E(V - I) reddening value implies E(B - V) = 0.25 ± 0.05 and a distance from the Sun of (3.8 ± 0.5) kpc. Star counts carried out within and outside the cluster region allowed us to estimate the cluster angular radius as 5′.3 ± 0′.3 (5.9 pc). When using the E(B - V) reddening value here derived and the original Washington photometric data of Geisler et al. (1991) for the stars confirmed as red cluster giants from Coravel radial velocities, we found [Fe/H] = -0.31 ± 0.04, which is in good agreement with the best fits of isochrones. Therefore, NGC 2324 is found to be a relatively young, metal-poor and distant open cluster located beyond the Perseus spiral arm. A comparison of NGC 2324 with 10 well-known open clusters of nearly the same age shows that the cluster metal abundance and its position in the Galaxy are consistent with the existence of a radial abundance gradient of -0.07 dex kpc-1 in the Galactic disc.
title	The relatively young, metal-poor and distant open cluster NGC 2324
title_short	The relatively young, metal-poor and distant open cluster NGC 2324
title_full	The relatively young, metal-poor and distant open cluster NGC 2324
title_fullStr	The relatively young, metal-poor and distant open cluster NGC 2324
title_full_unstemmed	The relatively young, metal-poor and distant open cluster NGC 2324
title_sort	relatively young, metal-poor and distant open cluster ngc 2324
publishDate	2004
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v418_n3_p979_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v418_n3_p979_Piatti
_version_	1768541636998987776

The relatively young, metal-poor and distant open cluster NGC 2324

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