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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Doppler imaging of Speedy Mic using the VLT. fast spot evolution on a young K-dwarf star
Astronomy and Astrophysics, Volume 435, No. 1, Year 2005
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Description
We study the short-term evolution of starspots on the ultrafast-rotating star HD 197890 ("Speedy Mic" = BO Mic, K 0-2 V, Prot = 0.380 d) based on two Doppler images taken about 13 stellar rotations apart. Each image is based on spectra densely sampling a single stellar rotation. The images were reconstructed by our Doppler imaging code CLDI (Clean-like Doppler imaging) from line profiles extracted by spectrum deconvolution. Our Doppler images constructed from two independent wavelength ranges agree well on scales down to 10° on the stellar surface. In conjunction with nearly parallel V-band photometry our observations reveal a significant evolution of the spot pattern during as little as two stellar rotations. We suggest that such a fast spot evolution demands care when constructing Doppler images of highly active stars based on spectral time series extending over several stellar rotations. The fast intrinsic spot evolution on BO Mic impedes the determination of a surface differential rotation; in agreement with earlier results by other authors we determine an upper limit of |α < 0.004 ± 0.002. © ESO 2005.
Authors & Co-Authors
Wolter, Uwe
Germany, Hamburg
Universität Hamburg
Schmitt, J. H.M.M.
Germany, Hamburg
Universität Hamburg
van Wyk, François G.
South Africa, Cape Town
South African Astronomical Observatory
Statistics
Citations: 12
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1051/0004-6361:20042239
ISSN:
00046361