The
COROT mission contemplates the fulfilment of two programs:
- Central programme:It is aimed on the detailed study of a few, carefully selected objects.
The targets of the seismology central programme must be such that
sufficiently populated fields exist in their immediate vicinity to
comply with the requirements of the exoplanet search programme.
Taking into account the satellite constraints, 49 objects were
selected from the following two categories:
- Bright stars (v < 6) F and G dwarfs and giants (39 objects)
- Delta Scuti stars (v < 9) (10 objects)
- Exploratory programme: The purpose of this programme is to
use the COROT capabilities to explore
different types of stars leading to a coverage of the HR diagram as
complete as possible. The catalogue of the exploratory programme is formed by 1119 objects with limiting magnitude around v=8-9.
For an optimal selection of the COROT sesismology targets (for both the
central and exploratory programmes), it is essential to gather as much
a priori information as possible on all potential targets. In particular, a precise and reliable knowledge of their projected rotational velocity,
effective temperatures, surface
gravities and chemical abundances is necessary. To comply with this
requirement an ambitious ground-based observing programme (Stromgrem
photometry, high resolution echelle spectroscopy and high angular
resolution imaging) was launched.
The Ground-Based Archive has been developed to efficiently use the data
obtained from these observing campaigns. The system works within the
client-server
framework of the system where the client queries the archive
access catalogue and requests data, and the server
responds.
Functionality
The COROT Ground-Based Archive System provides the following
functionality to the end-user:
- Search archive access catalogue
- Visualisation of spectra
- Data retrieval: spectra, photometric indices, physical parameters
- Retrieval of multiple spectra, with choice of compression
schemes
- On-line access to project documentation
Archive Searches
An access catalogue query is made by means of a fill-in form, and permits query by
object name (or list of objects), coordinates, spectral type, programme, scenario, photometric indices or physical parameters.
Four output formats (HTML, ASCII or
as tab- or comma-separated values) can be selected. The output fields (Spectroscopy, Photometry or Physical Parameters) may be
ordered by coordinates, object identification, spectral type, programme and scenario. An on-line description of each archive search-keyword is available via links embedded
in the query form.
Spectra are delivered as FITS files, and can be
imported into standard image processing packages such as
IDL, IRAF and MIDAS.
Data Retrieval
In the HTML output format, links are provided to plot and
download individual spectrum. Groups of spectra can be retrieved,
with group selection
defined according to file type ( Average or Full), or
fine-tuned by marking individual spectra. On-line descriptions of
each output column and of
data retrieval are
available via embedded links in the output form.
![[INTA]](./images/corot.gif)
![[COROT]](./images/inta.old.gif)