Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.307..685l&link_type=abstract
Monthly Notices, Volume 307, Issue 3, pp. 685-694.
Physics
14
Scientific paper
We present maximum-entropy reconstructions of the rapidly rotating dwarf single star BD+22 deg4409 (LO Peg) from observations at the William Herschel Telescope in 1993 August. Since this star is too faint to use the conventional single- or three-line Doppler imaging methods, we make use of the novel method of least-squares deconvolution, which utilizes the large number of photospheric lines in an echelle spectrum to produce a single high signal-to-noise ratio profile. The star-spot distributions from the image reconstructions show cool features at both high and low latitudes, in contradiction to recent theoretical predictions of the dynamo behaviour in rapidly rotating stars. Cross-correlation of the images from consecutive nights shows a good correlation from the small-scale structures, but no evidence of surface differential rotation. From the cross-correlation of the high-latitude spot we are able to reject the period of 9.22h of Jeffries et al. in favour of their preferred period of 10.17h, confirming the result of Robb & Cardinal.
Bartus János
Collier Cameron Andrew
Lister Tim A.
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