SIMBAD references

2007MNRAS.377..300P - Mon. Not. R. Astron. Soc., 377, 300-316 (2007/May-1)

Young star clusters immersed in intermediate-age fields in the Small Magellanic Cloud.


Abstract (from CDS):

We present CCD photometry in the Washington C and T1 filters for six star clusters (B34, NGC256, NGC265, NGC294, IC1611 and NGC376) in the Small Magellanic Cloud (SMC) and their surrounding fields. The resultant colour-magnitude diagrams (CMDs) extend from T1∼ 14 to as faint as T1∼ 22 revealing the main-sequence turnoffs of the clusters. Adopting a metallicity of Z = 0.004, we compare our cluster photometry with theoretical isochrones in the Washington system in order to derive ages. To facilitate age determination of the surrounding fields, we use the magnitude difference between the helium-burning red clump stars and the main-sequence turnoff. Finally, we estimate mean metallicities for the field stars by comparing the location of the field red giant branch with standard giant branches for Galactic globular clusters of known abundance, corrected for age effects. Combining these results with our previous work, we find a clear trend of younger clusters being located closer to the centre of the SMC. In addition, there is a tendency for the mean metallicity and its dispersion to be greater inside 4° of the SMC's centre as compared to outside this radius. As far as the properties of the field stars are concerned, we find little correlation between the ages of the clusters and those of the field stars against which they are projected. Clearly, more work needs to be done to clarify these trends.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): techniques: photometric - galaxies: individual: SMC - Magellanic Clouds - galaxies: star clusters

VizieR on-line data: <Available at CDS (J/MNRAS/377/300): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat>

Nomenclature: Table 2: [PSG2007] Bruck 34 NNNNN (Nos 1-40325). Table 3: Cl* NGC 256 PSG NNNNN (Nos 1-57984). Table 4: Cl* NGC 265 PSG NNNNN (Nos 1-57984). Table 5: Cl* NGC 294 PSG NNNNN (Nos 1-67539). Table 6: Cl* IC 1611 PSG NNNNN (Nos 1-45141). Table 7: Cl* NGC 376 PSG NNNNN (Nos 1-43815).

Status in Simbad:  will not be processed

Simbad objects: 9

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