An investigation of the micro-variations of highly luminous OBA type stars. III - The S DOR type star R 71 = HDE 169006 in the LMC

Astronomy and Astrophysics – Astrophysics

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Astronomical Photometry, Stellar Evolution, Supergiant Stars, Variable Stars, B Stars, Data Reduction, Light Curve, Magellanic Clouds, Stellar Color

Scientific paper

VBLUW photometry of the LMC S Dor type star R 71 = HDE 269006 is presented and discussed. It appears that the star similar to other high luminous OB type stars shows optical micro variations. The light amplitude is ≡0m.1 and the typical time scale ≡20d. The star fits well into the PLC relation for variable supergiants, suggesting that some type of pulsation is the cause. Contrary to a few other normal B type supergiants, the light curves of individual cycles are smooth and the V-B and B-L colours vary in anti-phase with each other. The largest colour variations usually occur in the B-U viz. ≡0m.02 (the U band contains the Balmer jump).

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