Absolute Magnitudes of Seismic Red Clumps in the Kepler Field and SAGA: The Age Dependency of the Distance Scale
文献类型：期刊论文
| 作者 | Chen, Y. Q.1,2,3; Casagrande, L.4; Zhao, G.1,2 ; Bovy, J.3; Aguirre, V. Silva5; Zhao, J. K.1; Jia, Y. P.1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2017-05-10 |
| 卷号 | 840期号:2 |
| 关键词 | asteroseismology stars: fundamental parameters stars: distances stars: late-type surveys |
| 英文摘要 | Red clump stars are fundamental distance indicators in astrophysics, although theoretical stellar models predict a dependence of absolute magnitudes with age. This effect is particularly strong below similar to 2 Gyr, but even above this limit a mild age dependence is still expected. We use seismically identified red clump stars in the Kepler field for which we have reliable distances, masses, and ages from the SAGA survey, to first explore this effect. By excluding red clump stars with masses larger than 1.6 M circle dot (corresponding to ages younger than 2 Gyr), we derive robust calibrations linking intrinsic colors to absolute magnitudes in the following photometric systems: Stromgren by, Johnson BV, Sloan griz, 2MASS JHK(s), and WISE W1W2W3. With the precision achieved we also detect a slope of absolute magnitudes similar to 0.020 +/- 0.003 mag Gyr(-1) in the infrared, implying that distance calibrations of clump stars can be off by up to similar to 0.2 mag in the infrared (over the range from 2 to 12 Gyr) if their ages are unknown. Even larger uncertainties affect optical bands, because of the stronger interdependency of absolute magnitudes on colors and age. Our distance calibrations are ultimately based on asteroseismology, and we show how the distance scale can be used to test the accuracy of seismic scaling relations. Within the uncertainties our calibrations are in agreement with those built upon local red clumps with Hipparcos parallaxes, although we find a tension, which, if confirmed, would imply that scaling relations overestimate the radii of red clump stars by 2 +/- 2%. Data releases post Gaia DR1 will provide an important testbed for our results. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | K-BAND MAGNITUDE ; GIANT STARS ; GALACTIC ARCHAEOLOGY ; STELLAR POPULATIONS ; ECLIPSING BINARIES ; INPUT CATALOG ; CHARA ARRAY ; ASTEROSEISMOLOGY ; CALIBRATION ; CLUSTERS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000403228100006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8830]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, A20 Datun Rd, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China 3.Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON, Canada 4.Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia 5.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark |
| 推荐引用方式 GB/T 7714 | Chen, Y. Q.,Casagrande, L.,Zhao, G.,et al. Absolute Magnitudes of Seismic Red Clumps in the Kepler Field and SAGA: The Age Dependency of the Distance Scale[J]. ASTROPHYSICAL JOURNAL,2017,840(2). |
| APA | Chen, Y. Q..,Casagrande, L..,Zhao, G..,Bovy, J..,Aguirre, V. Silva.,...&Jia, Y. P..(2017).Absolute Magnitudes of Seismic Red Clumps in the Kepler Field and SAGA: The Age Dependency of the Distance Scale.ASTROPHYSICAL JOURNAL,840(2). |
| MLA | Chen, Y. Q.,et al."Absolute Magnitudes of Seismic Red Clumps in the Kepler Field and SAGA: The Age Dependency of the Distance Scale".ASTROPHYSICAL JOURNAL 840.2(2017). |
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来源：国家天文台
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