2005A&A...435..261W


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET20:53:02

2005A&A...435..261W - Astronomy and Astrophysics, volume 435, 261-273 (2005/5-3)

Doppler imaging of Speedy Mic using the VLT. Fast spot evolution on a young K-dwarf star.

WOLTER U., SCHMITT J.H.M.M. and VAN WYK F.

Abstract (from CDS):

We study the short-term evolution of starspots on the ultrafast-rotating star HD 197890 (``Speedy Mic'' = BO Mic, K0-2 V, Prot=0.380d) 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.

Abstract Copyright:

Journal keyword(s): stars: activity - starspots - stars: late-type - stars: imaging - stars: individual: BO Mic

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V532 Per BY* 03 26 22.2273870866 +49 25 37.502101730   11.98 11.27     G2-3V 57 0
2 V* V410 Tau Or* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 435 0
3 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 947 0
4 V* LQ Hya BY* 09 32 25.5684079124 -11 11 04.687410738 9.316 8.761 7.891 7.288 6.815 K1Vp 408 0
5 HD 109200 PM* 12 33 31.3819885804 -68 45 20.911673809 8.472 7.987 7.140 6.661 6.237 K1V 112 0
6 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 294 0
7 HD 192844 * 20 18 56.5571940186 -44 31 28.014353868   8.49 7.55     K0III 18 0
8 HD 193132 * 20 20 22.6481111064 -42 54 04.220436240   8.75 7.79     K0III 14 0
9 V* BO Mic BY* 20 47 44.9892114361 -36 35 40.819135413   10.39 9.337   8.216 K3V(e) 169 0

    Equat.    Gal    SGal    Ecl

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