Artículo
Abstract:
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.
Registro:
| Documento: | Artículo |
| Título: | The relatively young, metal-poor and distant open cluster NGC 2324 |
| Autor: | Piatti, A.E.; Clariá, J.J.; Ahumada, A.V. |
| Filiación: | Inst. de Astron./Fis. del Espacio, Suc. 28, 1428 Buenos Aires, Argentina Observatorio Astronómico, Univ. Nacional de Córdoba, Laprida 854, 5000 Córdoba, Argentina |
| Palabras clave: | 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 |
| Año: | 2004 |
| Volumen: | 418 |
| Número: | 3 |
| Página de inicio: | 979 |
| Página de fin: | 988 |
| DOI: | http://dx.doi.org/10.1051/0004-6361:20041015-1 |
| Título revista: | Astronomy and Astrophysics |
| Título revista abreviado: | Astron. Astrophys. |
| ISSN: | 00046361 |
| CODEN: | AAEJA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v418_n3_p979_Piatti |
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Citas:
---------- APA ----------
Piatti, A.E., Clariá, J.J. & Ahumada, A.V. (2004) . The relatively young, metal-poor and distant open cluster NGC 2324. Astronomy and Astrophysics, 418(3), 979-988.http://dx.doi.org/10.1051/0004-6361:20041015-1
---------- CHICAGO ----------
Piatti, A.E., Clariá, J.J., Ahumada, A.V. "The relatively young, metal-poor and distant open cluster NGC 2324" . Astronomy and Astrophysics 418, no. 3 (2004) : 979-988.http://dx.doi.org/10.1051/0004-6361:20041015-1
---------- MLA ----------
Piatti, A.E., Clariá, J.J., Ahumada, A.V. "The relatively young, metal-poor and distant open cluster NGC 2324" . Astronomy and Astrophysics, vol. 418, no. 3, 2004, pp. 979-988.http://dx.doi.org/10.1051/0004-6361:20041015-1
---------- VANCOUVER ----------
Piatti, A.E., Clariá, J.J., Ahumada, A.V. The relatively young, metal-poor and distant open cluster NGC 2324. Astron. Astrophys. 2004;418(3):979-988.http://dx.doi.org/10.1051/0004-6361:20041015-1
