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Abstract:

New CCD photometry in the Washington system C and T1 passbands down to T1 ∼ 18.5 mag in the field of the northern open cluster NGC 2236 is presented. T1 magnitudes and C - T1 colours for a total of 1162 stars within an area of 13.6 × 13.6 arcmin2 were measured. These CCD data were supplemented with photoelectric CMT1T2 photometry of 13 red giant candidates. The comparison of the cluster (T1, C - T1) colour-magnitude diagram with theoretical isochrones computed for the Washington system yields E(C - T1) = 1.10 ± 0.10 and for log t = 8.80 (t = 600+100-40 Myr) and Z = 0.008. The derived E(C - T1) value implies E(B - V) = 0.55 ± 0.05. NGC 2236 is then located at 2.5 ± 0.5 kpc from the Sun beyond the Perseus spiral arm and at ∼10.8 kpc from the Galactic centre. A cluster angular diameter of 9.4 arcmin, equivalent to 6.8 pc, was estimated from star counts both within and outside the cluster field. We also derived from the stellar density profile a cluster core radius of rc = 1.7 arcmin (1.2 pc) and an annular corona of Δrc = 1.8rc (2.2 pc). Five independent Washington abundance indices yield a mean cluster metallicity of [Fe/H] = -0.3 ± 0.2, which is not only in reasonably good agreement with the one obtained from the isochrone fit, but also compatible with the existence of a radial abundance gradient in the Galactic disc. We examined the properties of a sample of 20 known open clusters aligned along the line-of-sight to NGC 2236. Berkeley 27 appears as the farthest and oldest cluster of the studied sample. © 2007 RAS.

Registro:

Documento: Artículo
Título:NGC 2236: A moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm
Autor:Clariá, J.J.; Piatti, A.E.; Parisi, M.C.; Ahumada, A.V.
Filiación:Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, 5000 Córdoba, Argentina
Instituto de Astronomía y Física del Espacio, CC 67, Ciudad de Buenos Aires, Argentina
Palabras clave:Open clusters and associations: general; Open clusters and associations: individual: NGC 2236; Techniques: photometric
Año:2007
Volumen:379
Número:1
Página de inicio:159
Página de fin:168
DOI: http://dx.doi.org/10.1111/j.1365-2966.2007.11920.x
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v379_n1_p159_Claria

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Citas:

---------- APA ----------
Clariá, J.J., Piatti, A.E., Parisi, M.C. & Ahumada, A.V. (2007) . NGC 2236: A moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm. Monthly Notices of the Royal Astronomical Society, 379(1), 159-168.
http://dx.doi.org/10.1111/j.1365-2966.2007.11920.x
---------- CHICAGO ----------
Clariá, J.J., Piatti, A.E., Parisi, M.C., Ahumada, A.V. "NGC 2236: A moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm" . Monthly Notices of the Royal Astronomical Society 379, no. 1 (2007) : 159-168.
http://dx.doi.org/10.1111/j.1365-2966.2007.11920.x
---------- MLA ----------
Clariá, J.J., Piatti, A.E., Parisi, M.C., Ahumada, A.V. "NGC 2236: A moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm" . Monthly Notices of the Royal Astronomical Society, vol. 379, no. 1, 2007, pp. 159-168.
http://dx.doi.org/10.1111/j.1365-2966.2007.11920.x
---------- VANCOUVER ----------
Clariá, J.J., Piatti, A.E., Parisi, M.C., Ahumada, A.V. NGC 2236: A moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm. Mon. Not. R. Astron. Soc. 2007;379(1):159-168.
http://dx.doi.org/10.1111/j.1365-2966.2007.11920.x