Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..387h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 387-398.
Astronomy and Astrophysics
Astronomy
49
Binary Stars, Doppler Effect, Maximum Entropy Method, Stellar Activity, Stellar Rotation, Calcium, Limb Brightening, Line Spectra
Scientific paper
The paper presents Doppler images of the spot distribution on HD 26337 (EI Eri) for the years 1984-1987. These images were derived using maximum entropy digital image reconstruction on time-resolved spectroscopy of the Ca I 6439-A line. All the images are characterized by a large spot with several appendages straddling the rotation pole. The image from 1987 marks the appearance of two equatorial spots. The existence of polar spots on RS CVn stars appears to be both a common and long-lived phenomenon. If spots emerge at the equator and migrate poleward to join with the feature there, then the migration rate must be fairly large in order to account for so few equatorial spots seen in the images. From the fact that the polar spot undergoes significant changes in its size and shape, in spite of the lack of equatorial spots in previous images, it is inferred that the polar distribution can change even without the accretion of equatorial spots.
Hatzes Artie P.
Vogt Steven S.
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