These instructions will allow you to browse through RR Lyrae variable stars in your region of interest using TOPCAT.

Open the TAP Query Window.

Open the TAP Query Window

Select the ARI-Gaia service.

Select the ARI-Gaia service

Specify the RA and Dec of the center of your region of interest, then enter the following ADQL query:

SELECT
    g.source_id,
    g.ra,
    g.dec,
    g.pm,
    g.parallax,
    r.int_average_g,
    r.pf,
    r.peak_to_peak_g
FROM gaiadr3.gaia_source AS g
INNER JOIN gaiadr3.vari_rrlyrae AS r
    ON g.source_id = r.source_id
WHERE CONTAINS(
    POINT('ICRS', g.ra, g.dec),
    CIRCLE('ICRS', 271.83743686, 9.56384673, 20)
) = 1
AND r.int_average_g < 13

Run the query and close the TAP window. Then sort the resulting table by int_average_g in ascending order.

Run the query and sort the table

Open the Sky Plot

Next, plot the variable star positions on the Sky Plot.

Variable stars in the Sky Plot

The default should display the positions in the equatorial coordinate system.

Open the results table

Double-click your table to open it. Verify that it is ordered by the int_average_g column.

RR Lyrae results table

The table lists the RR Lyrae variable stars, with the brightest stars at the top. It also includes each star’s oscillation period (pf) and peak-to-peak brightness variation (peak_to_peak_g).