Surface images of the short period contact binary AE Phe

Details Surface images of the short period contact binary AE Phe Surface images of the short period contact binary AE Phe

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004an....325..233b&link_type=abstract

Astronomische Nachrichten, Vol.325, Issue 3, p.233-236

Astronomy and Astrophysics

Astronomy

1

Stars: Spots, Stars: Imaging, Binaries: Eclipsing, Binaries: Spectroscopic, Techniques: Spectroscopic

Scientific paper

We present high resolution Doppler images of the short period (P = 0.362 d) contact binary AE Phe. Using least squares deconvolution, we make use of the information content of the several thousand lines in each échelle spectrum to obtain the necessary S/N and time resolution required to resolve individual starspot features. A single pair of rotationally broadened profiles (free of sidelobes due to blending) with a typical S/N of 3000 - 4000 per spectrum is thus obtained. With 300 sec exposures we achieve a cadence of 350 sec which is equivalent to sampling the rotation phase every 4 °. We derive images for four nights of data which reveal starspots at most latitudes on both components of the common envelope system. Individual starspots evolve significantly on very short timescales, of order one day; significantly faster than the week timescales found on active single stars and the Sun.

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