The following keywords can be given as input parameters for
catalogue queries. At least one keyword must be
chosen, and selecting two or more will further constrain
the query.
For help on a specific keyword, you may click on its
link in the input form.
The Object Name can refer to any of the names of the object given by the SIMBAD database. Searches are case independent, the full list of objects being retrieved by typing "%" or "*".
The spectral type of the object. Wildcars ("F%", "F*") are permitted.
A search by object position may be made by specifying
coordinates (equinox J2000), and optionally, a search radius
around this position.
The object RA is specified in the format hh:mm:ss.s
The object Dec is specified in the format (+)/-dd:mm:ss
The search radius (great circle distance) around the specified
RA and Dec, in the format dd:mm:ss. The default value is
5 arc minutes.The search
radius upper-limit is 10 degrees.
You may query the catalogue by a specific list of objects. The
object names may be either typed or pasted into the input box,
and must be entered as a column list (one object per row) in
either upper- or lower-case, with or without blanks, e.g.:
hd 37660
HD37674
HD 37756
The Signal to Noise Ratio has been measured at two (Elodie) or three (Feros) wavelengths representing the spectral coverage. The wavelengths were selected according the following criteria:
- They are located in continuum windows (that is, in regions as free as possible of strong absorption lines)
- For each order, they must be placed where the echelle response function reached the maximum
- To avoid confusion, they must be placed in regions with no order overlapping
The following wavelengths were selected accordingly:
- ELODIE:
- Wave1: 4624 Angstroms (order:25)
- Wave2: 6775 Angstroms (order:67)
- FEROS:
- Wave1: 4624 Angstroms (order:13)
- Wave 2: 6850 Angstroms (order:29)
- Wave3: 7820 Angstroms (order:33)
The mean value of a window of 15 pixel wide centered at the reference wavelengths was adopted. The Signal to Noise Ratio was measured according to the following definitions:
- ELODIE
S/N = flux / sqrt (flux+b**2)
- FEROS
S/N = 1. / sqrt (err (star)**2 + err (flat)**2) where
err(star) = sqrt (flux (star)+b**2) / flux (star)
err(flat) = sqrt (flux (flat)+b**2) / flux (flat)
Flux is the measured un-normalized flux expressed in
photo-electrons, and b is the readout noise, also in photo-electrons.
The output menus provide the means to select the format of the output
form. To enhance readability, the
heading is repeated after every 15th row of table output.
Two output fields are available, emphasising respectively Spectroscopy
(the default), and Photometry.
The output table may be generated in four formats, selected
from the pull-down menu as HTML (default), ASCII,
CSV and TSV:
This format provides the links for plotting and retrieving spectra.
It also
provides links embedded in the table heading to
explanations of each column, and for convenience, the table
heading is repeated after every 15th row of output. HTML
format is memory intensive on the client- and server-sides,
and so the number of 'hits' displayed is limited to 250
(see Show, below). Larger outputs
automatically default from HTML to ASCII format.
ASCII format
Output is formatted in plain ASCII text, with columns left
justified.
CSV format
Comma-separated values, an output format in ASCII which may
be imported into most spreadsheet applications.
TSV format
Tab-separated values, an output format in ASCII which may
be imported into most spreadsheet applications.
The output records (all formats) matching the input query
may be sorted by:
-
Coordinates (equinox J2000 coordinates)
-
Object ID (HD catalogue)
-
Spectral type
You may select to restrict the number of "hits" displayed,
i.e. the output page size (all formats). The total
number of records matching the input query is indicated,
but only the number specified by Show (default 50)
is listed in the output page.
For HTML format, if a query returns more than 250 records,
and the page size is not limited (Show="all"), the
output format automatically defaults from HTML to ASCII. In
this event, set Show to a convenient value (50, 100),
and navigate HTML output in pages of this
size, either by specifying a Page# in the
query form, or using the Previous Page and
Next Page buttons located at the foot of the
output form.
Note: For HTML output, it is generally more
efficient to page large queries into several small pages
(Show set to 50 or 100 records) than into fewer
large pages (250 records).
If the total number of records matching the input query
exceeds the page size specified by Show, you may
list specific pages with this option. For example,
if Show is 50 and there are 293 records matching the
input query, then setting Page # to 4 will list
records 151 to 200 (as ordered by the selected sorting
criterion). You may also navigate incrementally between
output pages by using the Previous Page and Next
Page buttons at the foot of the output form.
If this option is selected, the SQL command corresponding
to the input query to the catalogue will be displayed at
the top of the output form.
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Last update: May 2014.
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