Differential Rotation on the M-dwarf HK Aqr

Details Differential Rotation on the M-dwarf HK Aqr Differential Rotation on the M-dwarf HK Aqr

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..160j&link_type=abstract

NOAO Proposal ID #2001B-0160

Computer Science

Scientific paper

We propose to measure the surface differential rotation rate and starspot distribution on the rapidly rotating (P_rot=0.4307 d) dM1.5e dwarf HK Aqr using Doppler imaging techniques. We will determine the differential rotation rate on an M-dwarf for the first time, and investigate the dependence of differential rotation on spectral type. Such a dependence has important implications for models of angular momentum loss from solar-type stars. By cross-correlating constant- latitude strips from the resulting Doppler images, we will measure the latitude dependence of the surface stellar rotation rate for this star. This technique has been applied to two bright southern rapid rotator K0- dwarfs, AB Dor & PZ Tel, and shows that the rate of surface shear is very similar to that of the Sun, even though these stars rotate up to 50 times faster. We request four bright nights, separated by intervals of two nights to obtain echellograms covering almost one complete rotation every night, allowing us to track the effects of starspots and differential rotation on the stellar over several rotation periods.

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