Science, Space and Technology News 2024
A nearby star V889 Herculis rotates the fastest at a latitude of about 40 degrees. This unconventional rotational profile challenges established stellar models. Credit: Jani Närhi, University of Helsinki
A similar rotational profile has not been observed for any other star. The result is stunning because stellar rotation has been considered a well-understood fundamental physical parameter but such a rotational profile has not been predicted even in computer simulations. However, many factors such as stellar mass, age, chemical composition, rotation period, and magnetic field have effects on the rotation and give rise to variations in the differential rotation profiles.Thomas Hackman, docent of astronomy, who participated in the research, explains that the Sun has been the only star for which studying the rotational profile has been possible.
The second one of the target stars, LQ Hydrae in the constellation of Hydra, was found to be rotating much like a rigid body — the rotation appeared unchanged from the equator to the poles, which indicates that the differences are very small.The researchers base their results on the observations of the target stars from the Fairborn observatory.
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