HyPra: Anchoring the Rotation-Activity Relation At 600 Myr

众所周知，恒星的年龄很难确定，而我们目前无法测量恒星年龄，这严重限制了我们在天体物理学许多领域的进展。例如，恒星的年龄就是它的行星的年龄，我们必须知道这个年龄，才能评估给定行星具有有利于生命的条件的可能性。这项工作增进了我们对可观测到的年龄指标的理解，即恒星的自转和磁活动，因此我们最终可以使用这些指标来获得质量小于太阳的恒星的年龄。它还将支持一个实践教师培训计划，该计划为纽约市各地公立学校的天文俱乐部提供资金和支持。年龄-自转-活动关系(ARAR)的存在已经知道40年了，这给人们带来了希望，即自转或活动的测量可以用来获得孤立的场星的年龄。该项目将通过使用疏散星团中的恒星观测来改进ARARR的经验校准。这些恒星明确的年龄使它们成为测量自转周期和磁活动指标(如H-α和X射线光度)的有价值的目标。该项目的目标是完成对两个关键的600-Myr星系团--毕星座和北斗星座--自转和磁活动的敏感、公正的调查。新的观测将被用来测试旋转和活动之间的关系，以一种与质量无关的方式。这将有助于校准低质量的阿拉尔超过100英里。

The ages of stars are notoriously difficult to determine, and our current inability to measure stellar ages is severely limiting our progress in many areas of astrophysics. For example, the age of a star is the age of its planets, and we must know the age in order to evaluate the likelihood that a given planet has conditions favorable to life. This work advances our understanding of observable proxies for age, namely a star's rotation and magnetic activity, so that we can eventually use these to obtain ages for stars less massive than the Sun. It will also support a hands-on teacher-training program that seeds and supports astronomy clubs at public schools around New York City. The existence of an age-rotation-activity relation (ARAR) has been known for 40 years now, generating hope that measurements of rotation or activity could be used to obtain the ages of isolated field stars. This project will improve the empirical calibration of the ARAR by using observations of stars in open clusters. These stars' well-defined ages make them valuable targets for measuring rotation periods and indicators of magnetic activity such as H-alpha and X-ray luminosities. The goal of the project is to complete a sensitive, unbiased survey of rotation and magnetic activity in the Hyades and Praesepe, two key, nearby 600-Myr-old clusters. New observations will be used to test the relationship between rotation and activity in a mass-independent manner. This will help calibrate the low-mass ARAR beyond 100 Myr.