J2000 position |
The ELODIE archive hosts all the spectra produced by the
ELODIE spectrograph used at the 1.93 m telescope of
Observatoire de Haute Provence.
The spectrograph was used from 1993 through August 2006 and the database
contains more than 31000 public spectra (chosen with S/N(550nm)>10) of
astronomical interest which can be freely pre-viewed or downloaded from the archive.
There are 4 methods to access to the database:
Two pre-defined samples are available at present:
- Search by designation, around a designation or around a position in a pre-defined sample or in the whole catalogue:
The identifier can be a conventional name (for example:
HD141569, HIP062384, GJ719, VEGA, RR LYR, MOON) or a name to be resolved into a position by simbad (ex. simbad:vega). It is also possible to enter a short list of designations separated with comas or a part of a name, like GJ%, where the % will match any characters.
identifier can also be a position (ex. J17:28:50.1 +00:19:15 or J154958.1-035515). In these latter cases the search is made around the given position.
If the equinox of the coordinates is not specified, then the B1950 coordinates are used.
If the request is made around a designation or a position, the user should choose the field radius, otherwise, the default radius is of 10 arcmin around the specified designation.
- Search within a region of the sky in a pre-defined sample or in the whole catalogue.
The region of the sky consists in an interval of right ascension (RA) and declination (DEC) written in free format, for example:J hh mm ss and +dd mm ss (if the coordinates equinox is not specified, then the B1950 coordinates are used).
If no region is indicated, then the whole pre-defined sample or the whole catalogue will be listed.
Note: The coordinates are automatically transformed to epoch B1950 and the search is made inside the transformed box.
- Search by multiple contraints
Constraints may be defined on the designation, position, signal-to-noise ratio,
date of observation, name of observer and program number.
These constraints may be given as lists or ranges (lower and upper limits, if
the lower limit is not set it means: less than upper limit, and if upper
limit is not set, the meaning is: greater than lower limit).
Constraint on designation may be like: GJ%,vega.
- Search from a user's provided list of objects
A list of designation, with one name per line, may be uploaded from a file (example).
Short coma-separated lists may be entered in the 'designation' field of the
search by designation menu.
A query leads to a listing of all spectra corresponding to the request. Each row of the list contains the following fields:
The whole catalogue
The sample of stars for which the metallicity [Fe/H] has been measured in Cayrel de Strobel et al. (1997). This sample contains 6422 stars.
More detailed explanations are given in the help links located on top of each column. The user can accede to these links from the top of this page as well.
- identifier of the object (column "designation")
- coordinates (equinox/epoch J2000) (column "J2000 position")
- a direct link to Simbad for this object (when it is available) (column "s")
- the date of the night of observation (column "dataset")
- the number of observation during the night (column "imanum")
- the signal-to-noise ratio near 550 nm (column "sn")
- "plot" and "head" buttons allowing the user to visualize respectively the resampled spectrum (with a constant step of 0.05 Å) and the header file providing useful informations about the observation.
- A row contains also a "spec" and an "s2d" buttons allowing the user respectively to download the resampled spectrum (with a constant step of 0.05 Å) as a FITS file (with 3 extensions) and to download the 2-dimension FITS image (with 2 extensions) containing the 67 Echelle orders (column "view").
- Finally, a "custom" button is provided for each spectrum which allows the user to get to a web page providing an on-line data reduction software.
Below the list of observations a menu proposes, when relevant, to extend
the search to the vicinity, to sort the list according to some key
(right ascension, signal to noise ratio, date) or to filter the list by
applying additional constraints on some parameters.
This archive is actively maintained. We thus welcome feedback from the user
to help us detect anomalies and improve the website.