On-line Help to Data Query

Page content

Left frame:

List of the available data

Right upper frame:

Form to make data selection

This frame:

Display the search results

How to use it

Startup

At the beginning, the left frame lists the available data in the abbreviated form of the list of datatype designations

The upper frame displays the form to query the UBV data

Query

To make a query, click on the link corresponding to the selected datatype.

The corresponding form will appear in the upper frame

Fill the form.

Selection

To get data with a criterion like "value larger than a limit",

fill the area labelled Lower

To get data with a criterion like "value less than a limit",

fill the area labelled Upper

Fill both fields, if you wish to impose both limits

Submit the query

Press Submit Query to submit the query

Hints

Coordinates

Coordinates can be indicated

• in the standard form (hour, minute, second; degree, minute, second)
• in decimal form (hour.fraction; degree.fraction)

Spectral types

Selection may be based on various criteria, indicated in the "lower limit" text area:

• B will select all stars of type B0-B9
• B8 will select only the stars with type B8
• B8 V will select the stars with type B8 V
• Am will display the Am stars, A2m will display only the A2m stars.
• The same is valid for Ap stars.
• III will select only the giant stars (classe III).

Range of spectral types may also be used. To perform such a selection, enter the limiting spectral in the correponding text areas.

• Lower limit: B8, upper limit A2 will naturally select the stars between B8 and A2
• Lower limit: G8 III, upper limit K2 will select the red giants in the G8-K2 interval