论文标题
年轻开放群集NGC 6709中的旋转期分布
The Rotation Period Distribution in the Young Open Cluster NGC 6709
论文作者
论文摘要
开放式簇是校准质量，旋转和年龄之间具有对流区域外部关系之间关系模型的有用工具，这是由于群集内恒星的均匀性而导致的。群集与群集比较对于确定旋转关系的普遍性是否存在至关重要。选择NGC 6709作为一个年轻的开放群集，以前没有获得成员的旋转期。该集群的距离超过1 kpc，有两个红色巨型成员。等距将簇的年龄放在150 Myr左右，或与pleiades大约相同的年龄。在机器人天文台Stella的多个月观测季节中获得光度法。基本处理后，使用Daophot II得出了PSF光度法，并且一组相关的软件使我们能够为每个恒星创建相对幅度变化的时间序列。然后将四个时间序列分析方法应用于这些光曲线，以获得成员恒星的旋转周期。我们首次获得了NGC 6709的45个FGK群集成员的首次旋转期。我们将旋转期与Gaia EDR3颜色进行比较，并找到一个缓慢的旋转序列，而旋转周期增加了向红色恒星的旋转周期和较小的快速旋转器，尚未加入此序列。 NGC 6709的旋转周期与另一个pleiades-age开放群集NGC 2516非常相似。
Open clusters serve as a useful tool for calibrating models of the relationship between mass, rotation, and age for stars with an outer convection zone due to the homogeneity of the stars within the cluster. Cluster to cluster comparisons are essential to determine whether the universality of spin down relations holds. NGC 6709 is selected as a young open cluster for which no rotation periods of members have previously been obtained. This cluster is at a distance of over 1 kpc and has two red giant members. Isochrones place the age of the cluster at around 150 Myr, or approximately the same age as the Pleiades. Photometry is obtained over a multi-month observing season at the robotic observatory STELLA. After basic processing, PSF photometry was derived using Daophot II, and a suite of related software allowed us to create time series of relative magnitude changes for each star. Four time series analysis methods are then applied to these light curves to obtain rotation periods for members stars. We obtain for the first time rotation periods for 45 FGK cluster members of NGC 6709. We compare our rotation periods to Gaia EDR3 colors and find a slow-rotating sequence with increasing rotation periods towards redder stars and a smaller clump of rapid rotators that have not yet joined this sequence. NGC 6709 has rotation periods very similar to that of another Pleiades-age open cluster, NGC 2516.
