论文标题
光谱标准恒星的Gaia网格
The Gaia grid of spectro-photometric standard stars
论文作者
论文摘要
We describe the preliminary results of a ground-based observing campaign aimed at building a grid of approximately 200 spectro-photometric standard stars (SPSS), with an internal $\simeq 1$\% accuracy (and sub-percent precision), tied to CALSPEC Vega and Sirius systems within $\simeq 1$\%, for the absolute flux calibration of data gathered by {\it Gaia}, the欧洲航天局（ESA）天文任务。介绍了选择和候选人列表的标准，以及对调查策略和所采用的数据分析方法的描述。所有候选人也经过监视（大约在$ \ pm 5 $ mmag之内）。当前版本的网格包含大约最终样本的一半，它已经达到了目标准确性，但是随着未来的发行版，精度将大大提高。它将用于校准光谱和光度法的{\ it gaia}（e）DR3释放。
We describe the preliminary results of a ground-based observing campaign aimed at building a grid of approximately 200 spectro-photometric standard stars (SPSS), with an internal $\simeq 1$\% accuracy (and sub-percent precision), tied to CALSPEC Vega and Sirius systems within $\simeq 1$\%, for the absolute flux calibration of data gathered by {\it Gaia}, the European Space Agency (ESA) astrometric mission. The criteria for the selection and a list of candidates are presented, together with a description of the survey's strategy and the adopted data analysis methods. All candidates were also monitored for constancy (within $\pm 5$ mmag, approximately). The present version of the grid contains about half of the final sample, it has already reached the target accuracy but the precision will substantially improve with future releases. It will be used to calibrate the {\it Gaia} (E)DR3 release of spectra and photometry.
