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2001MNRAS.324..231B - Mon. Not. R. Astron. Soc., 324, 231-242 (2001/June-2)
Doppler images from dual-site observations of southern rapidly rotating stars - II. Starspot patterns and differential rotation on Speedy Mic.
BARNES J.R., COLLIER CAMERON A., JAMES D.J. and DONATI J.-F.
Abstract (from CDS):
Our surface maps reveal one of the most heavily spotted photospheres seen on a rapid rotator, with starspots occurring at all latitudes. At the time of observations, Speedy Mic had no strong polar spot, but it shows spots concentrated in low- and intermediate-latitude bands. We attempt a differential rotation measurement, but lack of sufficient phase coverage allows determination of only a lower limit of 59d for the time it takes the equatorial regions to lap the polar regions.
We also find variations in the heavily filled-in Hα line which can be attributed to prominences passing in front of the stellar disc. Despite the rapid rotation, the appearance of the same features on consecutive nights of observations shows the clouds to be stable on time-scales of at least a day.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): line: profiles - methods: data analysis - techniques: miscellaneous - stars: activity - stars: individual: Speedy Mic (HD 197890) - stars: late-type
Simbad objects: 22
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