A NEW METHOD TO CALIBRATE THE STELLAR COLOR/SURFACE-BRIGHTNESS RELATION

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2014-07-22 DOI:10.5303/JKAS.2014.47.4.153
A. Gould
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引用次数: 6

Abstract

I show that the standard microlensing technique to measure the angular radius of a star using color/surface-brightness relations can be inverted, via late-time proper motion measurements, to calibrate these relations. The method is especially useful for very metal-rich stars because such stars are in short supply in the solar neighborhood where other methods are most effective, but very abundant in Galactic bulge microlensing fields. I provide a list of eight spectroscopically identified high-metallicity bulge stars with the requisite finite-source effects, seven of which will be suitable calibrators when the Giant Magellan Telescope comes on line. Many more such sources can be extracted from current and future microlensing surveys.
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一种校正恒星颜色/表面亮度关系的新方法
我展示了使用颜色/表面亮度关系来测量恒星角半径的标准微透镜技术可以通过后期固有运动测量来校准这些关系。这种方法对富含金属的恒星特别有用,因为这类恒星在其他方法最有效的太阳附近供不应求,但在银河系凸起的微透镜场中却非常丰富。我提供了一份清单,列出了8颗经过光谱鉴定的高金属丰度膨胀恒星,它们具有必要的有限源效应,其中7颗将在巨型麦哲伦望远镜投入使用时成为合适的校准器。从当前和未来的微透镜调查中可以提取更多这样的来源。
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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