2005A&A...435L..21W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.22CEST00:58:18

2005A&A...435L..21W - Astronomy and Astrophysics, volume 435, L21-24 (2005/5-4)

Localizing plages on BO Mic. Rapid variability and rotational modulation of stellar Ca H&K core emission.

WOLTER U. and SCHMITT J.H.M.M.

Abstract (from CDS):

We have obtained a densely sampled time series of CaII H&K line profiles of the ultrafast rotating K-dwarf star BO Mic. Taken at high resolution, the spectra reveal pronounced variations of the emission core profiles. We interpret these variations as signs of concentrated chromospherically active regions, in analogy to solar plages. We further interpret the variations as partly due to the rapid growth and decay of plages, while other variations appear to be caused by plages moved over the visible stellar disk by rotation. The equivalent width of the Ca K core emission changes approximately in anti-phase to the photospheric brightness, suggesting an association of the chromospheric plage regions with pronounced dark photospheric spots. We believe that further analysis of the presented spectral time series will lead to a chromospheric Doppler image of BO mic.

Abstract Copyright:

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

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1125 0
2 * 36 Oph B PM* 17 15 20.9846233161 -26 36 10.159381821   5.88 5.03     K1V 227 0
3 V* BO Mic BY* 20 47 44.9892114361 -36 35 40.819135413   10.39 9.337   8.216 K3V(e) 166 0
4 V* AR Lac RS* 22 08 40.8180372773 +45 44 32.104045703 7.09 6.83 6.11     K0IVe+G5IV 697 0

    Equat.    Gal    SGal    Ecl

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2020.10.22-00:58:18

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