期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 413, 期 3, 页码 2218-2234出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18299.x
关键词
techniques: photometric; surveys; stars: rotation; open clusters and associations: individual: Hyades, Praesepe
资金
- National Aeronautics and Space Administration
- National Science Foundation
- Consortium Universities
- PPARC/STFC
- STFC [PP/D000963/1, PP/F000081/1, ST/G002533/1, PP/F000073/1, PP/F000065/1, ST/I001719/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F000081/1, PP/F000073/1, ST/I001719/1, ST/G002533/1, PP/F000065/1, PP/D000963/1] Funding Source: researchfish
We present the results of photometric surveys for stellar rotation in the Hyades and in Praesepe, using data obtained as part of the SuperWASP exoplanetary transit-search programme. We determined accurate rotation periods for more than 120 sources whose cluster membership was confirmed by common proper motion and colour-magnitude fits to the clusters' isochrones. This allowed us to determine the effect of magnetic braking on a wide range of spectral types for expected ages of similar to 600 Myr for the Hyades and Praesepe. Both clusters show a tight and nearly linear relation between J - K-s colour and rotation period in the F, G and K spectral range. This confirms that loss of angular momentum was significant enough that stars with strongly different initial rotation rates have converged to the same rotation period for a given mass, by the ages of Hyades and Praesepe. In the case of the Hyades, our colour-period sequence extends well into the M dwarf regime and shows a steep increase in the scatter of the colour-period relation, with identification of numerous rapid rotators from similar to 0.5 M-circle dot down to the lowest masses probed by our survey (similar to 0.25 M-circle dot). This provides crucial constraints on the rotational braking time-scales and further clears the way to use gyrochronology as an accurate age measurement tool for main-sequence stars.
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