Planet Hunters Talk

What kind of pulsating variable is this?

  • Stargate38 by Stargate38

    Is this 2 pulsating variable stars orbiting each other, or just one unusual star that happens to have a long-term variation (due to starspots, recent collision, etc.) along with the short-term pulsation? I've never seen one like that. Usually, there will be a single cycle (with a period of less than 2 days), but this is weird.


  • ajamyajax by ajamyajax in response to Stargate38's comment.

    Re Kepler Id: 7294867, RA/Dec 295.489590 42.820480

    You can often find stellar information here by searching by Position (use RA/Dec from the Stellar Properties, this example 295.489590 42.820480)

    Or here (also use RA/Dec with no comma separator):

    Results from VSX:

    Dist. ' Name AUID Coords (J2000) Const. Var. type Period (d) Mag. range

    0.00 ASAS J194158+4249.3 -- 19 41 57.50 +42 49 13.7 Cyg RS 1.03576 12.1 - 12.4 V

    Type RS: "RS Canum Venaticorum-type binary systems. The primaries are usually giants from late F to late K spectral type. A significant property of these systems is the presence in their spectra of strong Ca II H and K emission lines of variable intensity, indicating increased chromospheric activity of the solar type. These systems are also characterized by the presence of radio and X-ray emission. Their light curves look like sine waves outside eclipses, with amplitudes and positions changing slowly with time. The presence of this wave (often called a distortion wave) is explained by differential rotation of the star, its surface being covered with groups of spots; the period of the rotation of a spot group is usually close to the period of orbital motion but still differs from it, which is the reason for the slow change (migration) of the phases of the distortion wave minimum and maximum in the mean light curve in the case of the eclipsing binaries (E/RS). The variability of the wave's amplitude (which may be up to 0.5 mag. in V) is explained by the existence of a long-period stellar activity cycle similar to the 11-year solar activity cycle, during which the number and total area of spots on the star's surface vary."

    Results from Simbad: Listed as KIC 7294867 -- Long-period variable star on Simbad, Proper motions mas/yr: 0.2 -0.5, 19 41 57.498 +42 49 13.72

    And actually a busy region full of Kepler targets; you might enjoy browsing through that data here:


  • Stargate38 by Stargate38

    Thanks for the information. That was really confusing me.