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The metallicity distribution of F/G dwarfs derived from BATC survey data
Du, CH; Zhou, X; Ma, J; Shi, JR; Chen, ABC; Jiang, ZJ; Chen, JS
2004-11-01
发表期刊ASTRONOMICAL JOURNAL
卷号128期号:5页码:2265-2273
摘要Based on synthetic flux spectra calculated from theoretical atmospheric models, a calibration of temperature and metallicity for the dwarfs observed in the Beijing-Arizona-Taiwan-Connecticut multicolor photometric system is presented in this paper. According to this calibration, stellar effective temperatures can be obtained from some temperature-sensitive color indexes. The sample stars have colors and magnitudes in the ranges 0.1 < d - i < 0.9 and 14.0 < i < 20.5. The photometric metallicities for these sample stars can be derived by fitting SEDs. We determine the average stellar metallicity as a function of distance from the Galactic plane. The metallicity gradient is found to be d[Fe/H]/dz = -0.37 +/- 0.1 dex kpc(-1) for z < 4 kpc and d[Fe/H]/dz = -0.06 +/- 0.09 dex kpc(-1) between 5 and 15 kpc. These results can be explained in terms of different contributions in density distribution for Galactic model "thin disk,'' "thick disk,'' and "halo'' components. However, for the gradient in z > 5 kpc, it could not be interpreted according to the different contributions from the three components because of the large uncertainty. So it is possible that there is little or no gradient for z > 5 kpc. The overall distribution shows a metallicity gradient d[Fe/H]/dz = -0.17 +/- 0.04 dex kpc(-1) for z < 15 kpc.
关键词Galaxy : Abundances Galaxy : Disk Galaxy : Formation Galaxy : Halo Galaxy : Structure
收录类别SCI
语种英语
WOS记录号WOS:000224866500020
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被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8920
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Sch, Coll Phys Sci, Beijing 100012, Peoples R China
3.Natl Cheng Kung Univ, Dept Phys, Taipei 70148, Taiwan
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Du, CH,Zhou, X,Ma, J,et al. The metallicity distribution of F/G dwarfs derived from BATC survey data[J]. ASTRONOMICAL JOURNAL,2004,128(5):2265-2273.
APA Du, CH.,Zhou, X.,Ma, J.,Shi, JR.,Chen, ABC.,...&Chen, JS.(2004).The metallicity distribution of F/G dwarfs derived from BATC survey data.ASTRONOMICAL JOURNAL,128(5),2265-2273.
MLA Du, CH,et al."The metallicity distribution of F/G dwarfs derived from BATC survey data".ASTRONOMICAL JOURNAL 128.5(2004):2265-2273.
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