Data Archive of SMC Clusters

The data products will be defined by a "Product level" designation. The lower the number, the more basic the data product will be. The G refers to GIRAFFE data. All of these were reduced using the GIRAFFE data reduction pipleine girBLDRS.

The star ID numbers will be detailed in a preliminary version of the second data paper to be released soon.

The GIRAFFE observations of the SMC clusters had exposure times of  6x2275s per wavelength order, although in some cases there are more than 6 observations due to deterioration of sky conditions and hence repeat observations to match our constraints (6 central wavelengths).
 

NGC346 (113 stars observed with MEDUSA/GIRAFE:)

Details of stars and IDs from Evans et al. (2006) ; but note erratum Evans et al. (2007)
Finding chart available (fchart_346.eps).

Product level

Details

Format

Download

No. Spectra

Released

G0

Individual orders, single exposures, no sky subtraction (tarballs are 16-25MB)

ASCII

NGC346.3958.G0.V1.ascii.tar.gz
NGC346.4124.G0.V1.ascii.tar.gz
NGC346.4297.G0.V1.ascii.tar.gz
NGC346.4471.G0.V1.ascii.tar.gz
NGC346.4656.G0.V1.ascii.tar.gz
NGC346.6515.G0.V1.ascii.tar.gz

678 per tarfile

20041104

G1

Individual orders, single exposures, sky subtracted (tarballs are 16-25MB) . Note that these are the 2nd version release of the sky subtracted spectra. The sky subtraction is more robust, and these spectra should be used in preference to the previous vesion, V1.

ASCII

NGC346.3958.G1.V2.ascii.tar.gz
NGC346.4124.G1.V2.ascii.tar.gz
NGC346.4297.G1.V2.ascii.tar.gz
NGC346.4471.G1.V2.ascii.tar.gz
NGC346.4656.G1.V2.ascii.tar.gz
NGC346.6515.G1.V2.ascii.tar.gz

678 per tarfile

20060624

G2

Co-added spectra merged together (20MB)  IMPORTANT - SEE NOTE BELOW

ASCII

NGC346.G2.V1.tar.gz

113

20041104

G3

Normalised orders, merged together (20MB) IMPORTANT - SEE NOTE BELOW

ASCII

NGC346.G3.V1.tar.gz

113

20041104

 

NGC330 (115 stars observed with MEDUSA/GIRAFE and 5 observed with UVES:)

Details of stars and IDs from Evans et al. (2006) ; but note erratum Evans et al. (2007)
Finding chart available (fchart_330.eps).

Product level

Details

Format

Download

No. Spectra

Released

G0

Individual orders, single exposures, no sky subtraction (tarballs are 16-33MB)

ASCII

NGC330.3958.G0.V1.ascii.tar.gz
NGC330.4124.G0.V1.ascii.tar.gz
NGC330.4124.G0.V1.JUL05.ascii.tar.gz
NGC330.4297.G0.V1.ascii.tar.gz
NGC330.4471.G0.V1.ascii.tar.gz
NGC330.4656.G0.V1.ascii.tar.gz
NGC330.6515.G0.V1.ascii.tar.gz

regions where observed between 6-9 times, hence  between 690-1035 spectra in each tarball

20051124

G1

Individual orders, single exposures, sky subtracted (tarballs are 16-25MB). Note that these are the 2nd version release of the sky subtracted spectra. The sky subtraction is more robust, and these spectra should be used in preference to the previous vesion, V1.

ASCII

NGC330.3958.G1.V2.ascii.tar.gz
NGC330.4124.G1.V2.ascii.tar.gz
NGC330.4124.G1.V2.JUL05.ascii.tar.gz
NGC330.4297.G1.V2.ascii.tar.gz
NGC330.4471.G1.V2.ascii.tar.gz
NGC330.4656.G1.V2.ascii.tar.gz
NGC330.6515.G1.V2.ascii.tar.gz

regions where observed between 6-9 times, hence  between 690-1035 spectra in each tarball

20060624

G2

Co-added spectra merged together (20MB)  IMPORTANT - SEE NOTE BELOW

ASCII

NGC330.G2.V1.tar.gz
NGC330_4124_JUL05_G2.tar.gz

115
114

20050212
20051124

G3

Normalised orders, merged together (20MB) IMPORTANT - SEE NOTE BELOW

ASCII

 

 

 

UVES

UVES spectra of an extra 5 stars – observed with UVES during a different observing campaign by Danny Lennon (contact I. Hunter for more details of the particular stars)

ASCII

NGC330_UVES.tar.gz

5 stars

20060726


Notes

The NGC330 wavelength region centred on 4124 was re-observed in July 2005 due to quality problems with the first attempt. Both sets of
spectra are available in the above table, best to use the JUL05 versions. In these spectra there was light contamination from an
unknown sources
at the red end of a small portion of the CCD. Thus bright patch filters through to some of the spectra as a sharp rise at the redward end but it's not a major problem and rectifies out fairly easily for most of the stars. In NGC330 star  #105 is deliberately missing in the July 2005 spectra.  The fibre has hot pixel problems which destroyed extraction and sky subtraction etc.

ALL of the ascii spectra have been correcrted to the heliocentric velocity frame

When the tar files are unpacked, the individual spectra files will be labeled
cluster_wavelength_exposure_level_date_version.idnumber.fits : where exposure=exposure number (1-6), date=date of reduction, version=incremental number to allow re-release of corrected data, idnumber=running ID number in each field.

Example: NGC346_3958_01_G0_20040101_v01.099.fits  is NGC346 lambda_central=3958, exposure 01 (of 6), Level=G0, date reduced= 20040101, version=v01, Star ID number=99
If there are any corrections in the reductions, then a full release of these files will be done, with a note as to what has changed, and the version number will increment.

The co-added spectra are simple sums of the sky-subtracted orders, which have not been checked for binarity. They are meant to be used as a first-look data product but should not be used for science purposes before the individual exposures have been checked for radial velocity variability. They are also based on the V1 sky subtraction which� has been improved and released as V2. When consortia members do produce Vrad checked and corrected spectra, email me and I will make them available in the archive as a Level 4 product.