Differential rotation and star-spot evolution on HK Aqr in 2001 and 2002

Details Differential rotation and star-spot evolution on HK Aqr in 2001 and 2002 Differential rotation and star-spot evolution on HK Aqr in 2001 and 2002

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.352..589b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 352, Issue 2, pp. 589-599.

Astronomy and Astrophysics

Astronomy

15

Line: Profiles, Methods: Data Analysis, Techniques: Miscellaneous, Stars: Activity, Stars: Individual: Hk Aqr (Gl 890), Stars: Late-Type

Scientific paper

We present images of the rapidly rotating (Prot= 0.431 d) M1.5Ve dwarf HK Aqr, from data obtained during 2001 and 2002. Star-spots are found distributed at a range of latitudes during both observing seasons, but unlike other solar-type rapid rotators of higher mass, HK Aqr does not show a strong polar cap at either epoch. In addition to the surface brightness images, we make use of the four-night time-base over which the 2002 observations were made, in order to derive an estimate of the latitudinal dependent rotation on HK Aqr. We find that the equator-lap-pole time lies in the range -1449 to +448 d. Although very small, we are therefore unable to determine whether the degree of differential rotation is in the solar or anti-solar sense.

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