Data Retrieval

For help on a specific output column, you may click on its link in the output table heading, repeated after every 15th row of table output (HTML format only).

The Previous Page and Next Page buttons at the foot of the output form (HTML, ASCII, CSV and TSV formats) enable you to navigate incrementally between output pages when the total number of records returned by a query exceeds the page size as set by the parameter Show in the Query Form. 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 or 500 records).

The Query Form button returns you to the default query form, and the arrow icon returns you to the top of the output form.

Object Name

The object name as given in the Henry Draper (HD) catalogue. By clicking the link, the information available on SIMBAD is obtained.

Right Ascension

The Right Ascension of the object for equinox J2000. Source is SIMBAD.


The Declination of the object for equinox J2000. Source is SIMBAD.

Visual Magnitude

The apparent visual magnitude. Origin: Hipparcos


The spectroscopic observations were carried out using the following instrumentation.

Spectral Type

Origin: SIMBAD.

Browse Plot

To generate a browse plot of a spectrum click on the corresponding link in the output table column Plot (HTML format only). A zoom plot of a 50 Å-km/s region is generated by entering the desired central wavelength (Angstroms) in the shaded panel and either pressing Enter/Return or clicking Plot Zoom.

A new viewport, centred on the input wavelength is created; you therefore have an overview of the entire spectrum and a simultaneous detailed view of a 50 Å-km/s region. The viewport is automatically refreshed for subsequent zooms (on the same or a new spectrum). Clicking Reset Panel clears, and returns focus to, the wavelength input box.

Save Plot

To save a copy of a browse or zoom plot on your local computer, place the mouse cursor over the plot, click mouse button three (rightmost), and select "Save Image As..." [Source] in Netscape, or "Save Picture As..." [GIF] in Internet Explorer. The resultant disk file can then be re-plotted and printed with an image display utility such as xv.

Fetch and Mark

A detailed description of data retrieval options and compression schemes available in the HTML-format output form is given here

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Last update: May 2014.