Doppler Imaging of EK Dra
Abstract
We present three Doppler images, spanning slightly more than a year, of a young solar analogue EK Draconis. The spot locations obtained from these temperature maps are compared to the phases of the spots determined using long-term photometry. The Doppler images show both high and low latitude spots, which are at most 800 K cooler than the unspotted photosphere (5800 K). From the Doppler images we calculate light curves, which are inverted to spot phase probability maps as we have done earlier for real photometric observations. The phases of the spots in probability maps correspond to the phases of spots, or sometimes rather to the mean phase of a group of spots, seen in Doppler images. Moreover, the determined phases of the spots from calculated light curves are well in agreement with the phases determined from the real observations. This supports the idea that, although light curve inversions are not that sofisticated way to study the surface structures of the stars, i.e., star spots, the cyclic behaviour of the spot phases determined from the photometric inversions is indeed real.
- Publication:
-
IAU Joint Discussion
- Pub Date:
- August 2006
- Bibcode:
- 2006IAUJD...8E..48J