STELLA Open Cluster Survey (SOCS): An improved understanding of stellar rotation and open clusters

STELLA 疏散星团巡天 (SOCS)：加深对恒星旋转和疏散星团的了解

• 批准号: 398177380
• 负责人: Dr. Sydney A. Barnes
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/398177380?language=en
• 关键词: STELLA; Open; Cluster; Survey; SOCS

In recent years, the understanding of the rotation of cool stars has been making rapid progress. A key application has been the development of a way to derive the age of a main sequence star from its rotation period, a technique of wide-ranging importance in understanding the evolution of, for example, planets and star clusters, or more generally, chronologies in our Galaxy. Recent space-based observations have pushed prior studies out to older ages including near solar, and they have also confirmed and extended prior ground-based work on some of the nearest and well-known open clusters. However, there are no prospects for more studies of other essential clusters, to enable studies of various aspects of rotational evolution, and to sample in more detail the age and parameter space that is needed. In particular, we are interested in delineating a key main seqeunce rotational transition from fast to slow rotation in youngish open clusters. We are therefore proposing a ground-based study of these key clusters.Using our STELLA robotic observatory in Tenerife, we are able to provide time-series photometry with excellent nightly cadence over a months-long baseline, and millimag-level precision over wide areas of each cluster. We demonstrate this capability with a detailed description of our work on the open cluster M48. The imminent GAIA data release will enable us to construct clean membership lists for our clusters, and we will integrate this with relevant information from the literature and our own newly-acquired data.Our survey will provide deep, new, multi-color color-magnitude diagrams for the clusters down to low masses, together with consistent isochrone fits for all clusters, also using our recent YaPSI isochrones. We will also provide clean color-period diagrams for each target cluster, without contaminating non-members, and minimising period aliasing from short-baseline observations. These will enable the determination of precise rotational ages for each cluster. They will also enable a detailed understanding of the key transition from fast to slow rotation in open clusters, and a basis for evaluating and improving theoretical models, particularly with respect to core-envelope coupling, and magnetic transitions in young stars. Data products from this survey will be communicated broadly to the community in collaboration with e-science experts.

近年来，对冷星自转的认识取得了迅速的进展。一个关键的应用是发展了一种从自转周期中推导主序星星星年龄的方法，这是一种在理解行星和星星团的演化，或者更广泛地说，我们银河系的年表方面具有广泛重要性的技术。最近的天基观测将先前的研究推到了更老的年龄，包括太阳附近，它们也证实和扩展了先前对一些最近和众所周知的疏散星团的地面工作。然而，没有更多的研究其他基本集群的前景，使旋转演化的各个方面的研究，并采样更详细的年龄和参数空间是必要的。特别是，我们感兴趣的是描绘一个关键的主要seqeunce旋转过渡从快速到缓慢旋转的疏散星团。因此，我们建议对这些关键星团进行地面研究，利用我们在特内里费岛的STELLA机器人天文台，我们能够在长达数月的基线上提供具有出色夜间节奏的时间序列测光，并在每个星团的广泛区域内提供毫马格级精度。我们证明了这一能力，我们的工作的详细描述，疏散星团M48。即将发布的GAIA数据将使我们能够为我们的星系团构建干净的成员名单，我们将把它与文献中的相关信息和我们自己新获得的数据相结合。我们的调查将提供深入的，新的，多色的颜色-星等图，适用于低质量的星系团，以及所有星系团一致的等时线，也使用我们最近的YaPSI等时线。我们还将为每个目标集群提供干净的颜色周期图，而不会污染非成员，并最大限度地减少短基线观测的周期混淆。这将有助于确定每个星团的精确旋转年龄。它们还将使人们能够详细了解疏散星团中从快速旋转到缓慢旋转的关键转变，并为评估和改进理论模型奠定基础，特别是在核心-包络耦合和年轻恒星的磁性转变方面。本次调查的数据产品将与电子科学专家合作，广泛传播给社区。