Photospheric activity of HD 220140, the optical counterpart of the X-ray source H 2311+77

Astronomy and Astrophysics – Astrophysics

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Photosphere, Stellar Atmospheres, Variable Stars, X Ray Sources, Astronomical Observatories, Light Curve, Starspots, Stellar Luminosity, Stellar Rotation

Scientific paper

We present and discuss the photoelectric observations of HD 220140 obtained at Merate Observatory and compare them with the ones obtained by Bianchi et al. (1991). The star shows a variable light activity with a fundamental period of 2.766 d. At the epoch of our observations the light curve was double-wave shaped, while at the epoch of the Bianchi et al. (1991) data it was essentially a single wave. The light curve variability as well as the changing mean brightness of the star observed in our data can be explained by the rotation of a star with at least two groups of photospheric dark spots, whose extent and/or location is changing with characteristic time-scales of a few rotational cycles.

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