SIMBAD references

1999MNRAS.307..685L - Mon. Not. R. Astron. Soc., 307, 685-694 (1999/August-2)

Doppler imaging of BD +22 4409 (LO Peg) using least-squares deconvolution.

LISTER T.A., COLLIER CAMERON A. and BARTUS J.

Abstract (from CDS):

We present maximum-entropy reconstructions of the rapidly rotating dwarf single star BD+22°4409 (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.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): line: profiles - techniques: image processing - stars: activity - stars: atmospheres - stars: individual: BD+22 4409 - stars: late-type

Simbad objects: 5

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