GAUDIGround-based Asteroseismology

Uniform Database Interface

http://ines.laeff.esa.es/corot/ E. Solano

Bases de données en spectroscopie stellaire.

Paris. Sep. 2003

E. Solano. Paris. Sep 2003

Target selection in the COROT mission is a critical issue (staying six months observing a binary star would have been very depressing).

The origins

Theoretical pulsation models requires a precise knowledge of the stellar physical parameters (Teff, log g, metallicity)

An ambitious ground-based observing programme (more than 1500 objects, mainly spectroscopy and photometry) was initiated.

Having an user-friendly access system to these data was considered as of fundamental importance since the beginning of the project.

March 2001: LAEFF - COROT agreement to develop GAUDI.

E. Solano IAA. Feb 2003

Archives: are they necessary? Efficiency: The collective impact of the archive will far exceed what could be produced by the programs of single observer or team of observers.

Astronomers might find that the observations they wanted had already been made, and that it was simply a matter of retrieving the relevant information.

One set of observations can serve many different scientific purposes, including some not considered when the observations were made.

Exploit the time domain.

Periodic phenomena: Variable stars

Transient phenomena: SN, NEO, GRB,..

E. Solano. Paris. Sep 2003

Legacy: Guarantee that the valuable datasets are usable by future generations for research and education.

The need of Archives (II)

“A well-designed and properly implemented archive is a major contribution toward the full exploitation from the expensive-to-obtain observational data”.

Positive “Globalization”: Astronomers from countries with limited resources have the opportunity of accessing high-quality data.

Processing Pipeline

Reduceddata

+Raw Data

Calib. Files

Science Archive

Database(Meta-data)

Storage system(FITS files)

E. Solano. Paris. Sep 2003

Data Storage

E. Solano. Paris. Sep 2003

Data will resided on a mass storage system (magnetic disks) in FITS format.

Data integrity requires a well-defined backup policy and data safekeeping.

Data stored in the archive are indexed in an inventory management subsystem (RDBMS).

To ensure integrity, metadata will be extracted from FITS keywords and ingested the database in an automatic way.

Data Management

Processing Pipeline

Reduceddata

+Raw Data

Calib. Files

Science Archive

Database(Meta-data)

Storage system(FITS files)

User Interface(HTML)End-User

E. Solano. Paris. Sep 2003

Data Retrieval and User Interface System

The friendliness of the user interface is extremely important for the archive to be effectively used by the community at large.

The UI will be HTML-based to allow simple use through the Web.

The system should be easy for new users to learn.

E. Solano. Paris. Sep 2003

The User Interface

Data query & retrieval

System description, On-line help &

Helpdesk

User InterfaceUser Interface

c Visualisation & analysis tools

Interoperability

E. Solano. Paris. Sep 2003

GAUDI. The Help Systems

Different levels of help to users

On-line Access to project documentation: A detailed description of the project, the archive and access system shall be given on-line and stored in a format allowing an easy browsing (e.g. PDF).

On-line help: Help on a specific keyword can be obtained by simply clicking on it.

HelpDesk: to channel questions and to provide continuous support to users of the Archive.

GAUDI. The Help Systems

On-line Help

E. Solano. Paris. Sep 2003

E. Solano. Paris. Sep 2003

The User Interface

Data query & retrieval

System description, On-line help &

Helpdesk

User InterfaceUser Interface

c Visualisation & analysis tools

Interoperability

Data query & retrieval

The GAUDI welcome page

c

• Access restricted to COROT project

• Username & password provided on demand.

The COROT input query form

The result of the query

Name resolver.

Multidownload with different

compression formats

Link to SIMBAD

The result of the query

Display of the FITS header

The result of the query

Plotting facilities

Plot can be saved as GIF file

Zoom facility

Link to full header

The COROT input query form

The result of the query

The COROT input query form

The result of the query

E. Solano. Paris. Sep 2003

The User Interface

Data query & retrieval

System description, On-line help &

Helpdesk

User InterfaceUser Interface

c Visualisation & analysis tools

Interoperability

Analysis tools

E. Solano. Paris. Sep 2003

Multi-range spectroscopy: building of SEDs

Comparison to models or theoretical data

Data mining

““A modern multi-wavelength data server must A modern multi-wavelength data server must not be a simply data repository. It must include not be a simply data repository. It must include tools to help the users in the data analysis”tools to help the users in the data analysis”

E. Solano IAA. Feb 2003

Synthetic modelSynthetic models

Comparison to models or theoretical data

E. Solano. Paris. Sep 2003

E. Solano. Paris. Sep 2003

The User Interface

Data query & retrieval

System description, On-line help &

Helpdesk

User InterfaceUser Interface

c Visualisation & analysis tools

Interoperability

Science Archive

Science Archive

Science Archive

The GAUDI Interoperability

Science Archive

GAUDI

E. Solano. Paris. Sep 2003

c

Internal

Among the Mission & User Archives and the preparatory archives (COROTSKY and GAUDI).

Interoperability Levels

E. Solano. Paris. Sep 2003

External First level:

General-purpose catalogues: ADS, SIMBAD Second level:

Other astronomical databases: 2MASS, DENIS, SLOAN, DSS, ...

Third level: VO federation. Uniform access to a federation of multi-wavelength distributed archives. Data exchange according to agreed standards.