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Piatti, A.E.; Clariá, J.J.; Bica, E.; Geisler, D.; Ahumada, A.V.; Girardi, L. "Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud" (2011) Monthly Notices of the Royal Astronomical Society. 417(2):1559-1575
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Abstract:

We present CCD photometry in the Washington system C, T1 and T2 passbands down to T1~ 23 in the fields of L3, L28, HW66, L100, HW79, IC1708, L106, L108, L109, NGC643, L112, HW84, HW85 and HW86, 14 Small Magellanic Cloud (SMC) clusters, most of them poorly studied objects. We measured T1 magnitudes and C-T1 and T1-T2 colours for a total of 213516 stars spread throughout cluster areas of 14.7 × 14.7arcmin2 each. We carried out an in-depth analysis of the field star contamination of the colour-magnitude diagrams (CMDs) and statistically cleaned the cluster CMDs. Based on the best fits of isochrones computed by the Padova group to the (T1, C-T1) CMDs, as well as from the δ(T1) index and the standard giant branch procedure, we derived ages and metallicities for the cluster sample. With the exception of IC1708, a relatively metal-poor Hyades-age cluster, the remaining 13 objects are between intermediate and old age (from 1.0 to 6.3Gyr), their [Fe/H] values ranging from -1.4 to -0.7dex. By combining these results with others available in the literature, we compiled a sample of 43 well-known SMC clusters older than 1Gyr, with which we produced a revised age distribution. We found that the present clusters' age distribution reveals two primary excesses of clusters at t~ 2 and 5Gyr, which engraves the SMC with clear signs of enhanced formation episodes at both ages. In addition, we found that from the birth of the SMC cluster system until approximately the first 4Gyr of its lifetime, the cluster formation resembles that of a constant formation rate scenario. © 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS.

Registro:

Documento: Artículo
Título:Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud
Autor:Piatti, A.E.; Clariá, J.J.; Bica, E.; Geisler, D.; Ahumada, A.V.; Girardi, L.
Filiación:Instituto de Astronomía y Física del Espacio, CC 67, Suc. 28, 1428 Capital Federal, Argentina
Observatorio Astronómico, Laprida 854, 5000 Córdoba, Argentina
Depto. de Astronomía, Universidade Federal do Rio Grande do Sul, CP 15051, Porto Alegre 91500-970, Brazil
Departamento de Física, Universidad de Concepción, Casilla 160-C, Concepción, Chile
European Southern Observatory, Alonso de Córdova 3107, Santiago, Chile
Osservatorio Astronomico di Padova INAF, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Palabras clave:Galaxies: individual: SMC; Galaxies: star clusters: general; Magellanic Clouds; Techniques: photometric
Año:2011
Volumen:417
Número:2
Página de inicio:1559
Página de fin:1575
DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18627.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_v417_n2_p1559_Piatti

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Citas:

---------- APA ----------
Piatti, A.E., Clariá, J.J., Bica, E., Geisler, D., Ahumada, A.V. & Girardi, L. (2011) . Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 417(2), 1559-1575.
http://dx.doi.org/10.1111/j.1365-2966.2011.18627.x
---------- CHICAGO ----------
Piatti, A.E., Clariá, J.J., Bica, E., Geisler, D., Ahumada, A.V., Girardi, L. "Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud" . Monthly Notices of the Royal Astronomical Society 417, no. 2 (2011) : 1559-1575.
http://dx.doi.org/10.1111/j.1365-2966.2011.18627.x
---------- MLA ----------
Piatti, A.E., Clariá, J.J., Bica, E., Geisler, D., Ahumada, A.V., Girardi, L. "Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud" . Monthly Notices of the Royal Astronomical Society, vol. 417, no. 2, 2011, pp. 1559-1575.
http://dx.doi.org/10.1111/j.1365-2966.2011.18627.x
---------- VANCOUVER ----------
Piatti, A.E., Clariá, J.J., Bica, E., Geisler, D., Ahumada, A.V., Girardi, L. Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud. Mon. Not. R. Astron. Soc. 2011;417(2):1559-1575.
http://dx.doi.org/10.1111/j.1365-2966.2011.18627.x