STELLA meets RAVE: a search for Maunder Minimum candidate stars

STELLA 遇见 RAVE：寻找蒙德极小候选明星

• 批准号: 264056313
• 负责人: Dr. Silva P. Järvinen
• 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: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/264056313?language=en
• 关键词: STELLA; meets; RAVE; search; Maunder

The RAVE database contains low-resolution CaII infrared triplet (IRT) spectra for 483330 individual stars. We estimate 50000 of them to show an emission component in the core of the resonance lines. With a proper CaII IRT flux calibration from high-resolution spectroscopy with STELLA, we plan to not only convert the RAVE CaII IRT spectra to absolute emission line fluxes but also determine flux-flux relations with CaII H&K and H alpha. From this we intend to infer a solid empirical relation between CaII emission-line flux and effective temperature and gravity, corrected for metallicity. Additional high-resolution echelle spectra shall allow us to analyse the relationships between fluxes measured throughout the optical-NIR spectral range. Finally, we will use our calibrated-flux sample to select a list of true Maunder-minimum candidate stars for further observations.

RAVE数据库包含483330颗恒星的低分辨率CaII红外三重态（IRT）光谱。我们估计其中有50000个在共振线的核心显示出发射成分。与适当的CaII IRT通量校准从高分辨率光谱与STELLA，我们计划不仅将RAVE CaII IRT光谱转换为绝对发射线通量，但也确定通量与CaII H&K和H α的通量关系。从这一点，我们打算推断一个坚实的经验关系CaII发射线通量和有效的温度和重力，校正金属丰度。额外的高分辨率阶梯光谱将使我们能够分析在整个光学近红外光谱范围内测量的通量之间的关系。最后，我们将使用我们校准的通量样本来选择一个真正的蒙德最小候选星的列表，以进行进一步的观测。

项目成果

HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights

三颗锐线赫比格 Ae 星的 HARPS 光谱偏振测量：新见解

• DOI: 10.1051/0004-6361/201526903
• 发表时间: 2015
• 期刊: arXiv: Solar and Stellar Astrophysics
• 作者: Järvinen;Carroll;Hubrig
• 通讯作者: Hubrig

Chemical spots on the surface of the strongly magnetic Herbig Ae star HD 101412

强磁 Herbig Ae 星 HD 101412 表面的化学斑点

• DOI: 10.1002/asna.201512353
• 发表时间: 2016
• 期刊: Astronomische Nachrichten
• 影响因子: 0.9
• 作者: Järvinen;Hubrig;Schöller
• 通讯作者: Schöller