Doppler imaging with a CLEAN -- like approach. 2: A photospheric image of AB Doradus (=HD 36705)

Details Doppler imaging with a CLEAN -- like approach. 2: A photospheric image of AB Doradus (=HD 36705) Doppler imaging with a CLEAN -- like approach. 2: A photospheric image of AB Doradus (=HD 36705)

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..899k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 899-921

Astronomy and Astrophysics

Astrophysics

72

Computer Aided Mapping, Doppler Effect, Imaging Techniques, K Stars, Starspots, Stellar Rotation, Stellar Spectra, Algorithms, Image Processing, Light Curve, Spectrum Analysis, Stellar Spectrophotometry, Telluric Lines

Scientific paper

In an application of a new CLEAN-like algorithm for the Doppler imaging of late-type stars we present the first in our series of suface images of the young KOV star AB Dor (=HD 36705). This Doppler image results from our discovery of profile variations in photospheric CaI and FeI absorption lines. We find star spots concentrated near an active latitude of +25 deg; one feature also extends towards higher latitudes. The reconstructed photospheric features appear as groups of small spots rather than as large individual spots. We discuss the reality of these groups on the basis of tests carried out on simulated data. We compare the two-temperature CLEAN image with a maximum entropy reconstruction of AB Dor's surface performed on the same data set. As an important test for the derived Doppler image we demonstrate its ability to predict the observed light curve which we have obtained from contemporaneous photometry. Furthermore, we demonstrate how Doppler imaging can be used to determine the stellar inclination.

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