天文学进展2018，Vol.36Issue(2)：101-121,21.DOI:10.3969/j.issn.1000-8349.2018.02.02
SAGE巡天介绍I——测光系统和数据处理
Stellar Abundance and Galaxy Evolution Survey——Photometric System and Data Reduction
摘要
Abstract
The SAGE(Stellar Abundance and Galactic Evolution)survey utilizes a special photometric system,which includes 8 bands in total,uSC,vSAGE,g,r,i,Hαw,Hαnand λDDO51.Compared to the uvbyβ system,the SAGE system is designed more sensitive to the stellar atmospheric parameters(i.e.,effective temperature Teff,surface gravity lg g and metallicity [Fe/H])and interstellar extinction.The system is also more efficient in observations as the bandwidths of g,r,i bands are much wider than those of the uvbyβ system.Therefore,the accuracy of the stellar parameter measurement of the SAGE system could actually exceed that of the broadband photometry.Three telescopes(2.3-m Bok telescope of Steward Observatory of University of Arizona,Nanshan 1-m telescope of Xinjiang Astronomical Observatory and Maidanak Astronomical Observatory(MAO)1-m telescope of Uzbekistan)are used and all the observations of the survey will be completed within about 4 years.The footprint is more than 12 000(°)2of the north sky and the magnitude coverage of the high precision photometry is about 15 mag(100σ)in V-band; the 5σ detection limit is about 20.0 mag in V-band.Finally in total about 0.5 billion stars will be detected,and the stellar atmospheric parameters as well as the interstellar extinction will be determined.The SAGE survey actually could extend about 7~8 mag(V-band)fainter than the previous uvbyβ survey,e.g.,the Geneva-Copenhagen Survey(GCS)and the HM survey.关键词
测光系统/数据处理/流量定标/天测定标/银河系结构Key words
photometric system/imaging data reduction/flux calibration/astrometric cali-bration/Galactic structure分类
天文与地球科学引用本文复制引用
范舟,姜晓军,马路,赵刚,王炜,赵景昆,郑捷,谈克峰,刘玉娟,何维,宋轶晗..SAGE巡天介绍I——测光系统和数据处理[J].天文学进展,2018,36(2):101-121,21.基金项目
国家自然科学基金 (11390371,11373003) （11390371,11373003）
国家自然科学基金联合基金 (U1631102) （U1631102）
973 项目(2015CB857002) （2015CB857002）
