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Cargile, P A; James, D J; Pepper, J; Kuhn, R B; SIVERD, R; Stassun, K G
The Astrophysical journal, 02/2014, Letnik: 782, Številka: 1Journal Article
We report periods for 33 members of Blanco 1 as measured from Kilodegree Extremely Little Telescope-South light curves, the first reported rotation periods for this benchmark zero-age-main-sequence open cluster. The distribution of these stars spans from late-A or early-F dwarfs tomid-K with periods ranging from less than a day to ~8 days. The rotation period distribution has a morphology similar to the coeval Pleiades cluster, suggesting the universal nature of stellar rotation distributions. Employing two different gyrochronology methods, we find an age of 146 super(+13) sub(-14) Myr for the cluster. We find the Skumanich-like spin-down rate sufficiently describes the rotation evolution of stars hotter than the Sun; however, we find cooler stars rotating faster than predicted by a Skumanich law, suggesting a mass dependence in the efficiency of stellar angular momentum loss rate. Finally, we compare the Blanco 1 and Pleiades rotation period distributions to available nonlinear angular momentum evolution models.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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