 Other pulsation modes have been detected at 89 to 234 days, with the strongest being a possible non-radial p-mode at 107 days and a possible non-radial g-mode at 185 days.The blue giant secondary has a similar mass and luminosity to the supergiant primary, but is visually much fainter.The primary is expected to have lost around since it was on the main sequence, and has expanded and cooled so it lies at the blue edge of the Cepheid instability strip.