Interferometric Observations of Benchmark Stars for Calibrating Large Stellar Surveys of the Milky Way

用于校准银河系大型恒星巡天的基准星干涉观测

• 批准号: 409503145
• 负责人: Dr. Iva Karovicova, Ph.D.
• 金额: --
• 依托单位: Research School of Astronomy and Astrophysics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/409503145?language=en
• 关键词: Interferometric; Observations; Benchmark; Stars; Calibrating

The research aim of the project is to deliver precise stellar parameters of stars that will be used as gold standard stars for large stellar surveys of the Milky Way, e.g., the astrometric space mission Gaia and its ground-based spectroscopic complementary survey Gaia-ESO and many others. I. Karovicova (applicant) obtained interferometric observations of a sample of stars that were chosen in collaboration with stellar survey teams. Those are specially selected stars with an extensive range in metallicity and evolutionary phases. The interferometric observations of these stars obtained by I. Karovicova provide precise measurements of angular diameters and deliver accurate direct determination of effective temperatures. These effective temperatures are spectroscopically model-independent and have much higher accuracy compared to the ones delivered by standard spectroscopic and photometric methods. The directly determined, and fully independent, effective temperatures are essential for testing and improving stellar-atmosphere models and synthetic spectra. Those are required for the correct assessment of the atmospheric parameters of survey sources. The presented project will deliver precise and homogenize parameters for a sample of benchmark stars that will help to calibrate not only the individual surveys such as Gaia, GALAH, APOGEE, and Gaia-ESO, but it will also help to correctly cross-calibrate them. The entire astronomical community will benefit from this study because using a single, homogeneous sample of gold standard stars is the only way how to properly calibrate and cross-calibrate different large stellar surveys and thus fully employ the great potential the survey data hold, and thereby advance our understanding of the structure and evolution of our Galaxy.

该项目的研究目的是提供精确的恒星恒星参数，这些参数将用作银河系大型恒星巡天的黄金标准恒星，例如天体测量空间任务盖亚及其地面光谱补充巡天盖亚-欧洲南方天文台等。 I. Karovicova（申请人）获得了与恒星调查团队合作选择的恒星样本的干涉观测结果。这些是经过精心挑选的恒星，具有广泛的金属丰度和演化阶段。 I. Karovicova 对这些恒星的干涉观测提供了角直径的精确测量，并提供了有效温度的准确直接确定。这些有效温度与光谱模型无关，并且与标准光谱和光度方法提供的温度相比具有更高的精度。直接确定且完全独立的有效温度对于测试和改进恒星大气模型和合成光谱至关重要。这些是正确评估调查源的大气参数所必需的。所提出的项目将为基准恒星样本提供精确且均质的参数，这不仅有助于校准盖亚、GALAH、APOGEE 和 Gaia-ESO 等个别巡天，而且还有助于正确地交叉校准它们。整个天文学界都将从这项研究中受益，因为使用单一、均匀的金标准恒星样本是正确校准和交叉校准不同大型恒星巡天的唯一方法，从而充分利用巡天数据的巨大潜力，从而增进我们对银河系结构和演化的理解。