Spectra of SMC star clusters (Piatti+, 2005)

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Magellanic Clouds, Associations: Stellar, Spectroscopy

Scientific paper

The observations were carried out with the CASLEO 2.15m telescope during four nights in November 2001 and five nights in October 2002 and with the CTIO 1.5 m telescope during four nights in September 2003. In all the CASLEO runs we employed a CCD camera containing a Tektroniks chip of 1024x1024 pixels attached to a REOSC spectrograph (simple mode), the size of each pixel being 24{mu}mx24{mu}m; one pixel corresponds to 0.94arcsec on the sky. The slit was set in the East-West direction and the observations were performed by scanning the slit across the objects in the North-South direction in order to get a proper sampling of cluster stars. The long slit corresponding to 4.7arcmin on the sky, allowed us to sample regions of the background sky. We used a grating of 300 grooves/mm, producing an average dispersion in the observed region of ~140{AA}/mm (3.46{AA}/pixel). The spectral coverage was ~3600-6800{AA}. The slit width was 4.2arcsec, providing a resolution [full width at half-maximum (FWHM)] of ~14{AA}, as deduced from the comparison lamp lines. For the CTIO observations, we used a CCD Loral 1K chip of 1200x800 pixels (pixel diameter = 15{mu}m), controlled by the CTIO ARCON3.9 data acquisition system at a gain of 2.05e-ADU-1 with a readout noise of 7.4e-ADU-1. The same slit width of 4.2arcsec as in CASLEO was used at CTIO, thus providing a resolution of about 11{AA}. We applied to the cluster spectra extinction corrections and flux calibrations derived from the observed standard stars. The spectra presented here are not corrected for interstellar extinction and their fluxes (J/s/m^+2/nm) are normalized to 1 at 5870{AA}. Cluster information is in the table clusters.dat.
(2 data files).

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