Zobrazeno 1 - 10
of 460
pro vyhledávání: '"Tian, Haijun"'
Autor:
Lin, Jun, Guo, Rui, Bird, Sarah A., Tian, Haijun, Liu, Chao, Flynn, Chris, Liu, Gaochao, Cui, Sheng
We select 1,052,469 (754,635) thin disk stars from {\it Gaia} eDR3 and LAMOST DR7 in the range of Galactocentric radius $R$ (guiding center radius $R_\mathrm{g}$) from 8 to 11\,kpc to investigate the asymmetries between the North and South of the dis
Externí odkaz:
http://arxiv.org/abs/2401.04688
Estimating precise metallicity of M dwarfs is a well-known difficult problem due to their complex spectra. In this work, we empirically calibrate the metallicity using wide binaries with a F, G, or K dwarf and a M dwarf companion. With 1308 FGK+M wid
Externí odkaz:
http://arxiv.org/abs/2312.12827
Autor:
Zhang, Shan, Liu, Gaochao, Huang, Yang, Lv, Zongfei, Bird, Sarah Ann, Chen, Bingqiu, Zhang, Huawei, Beers, Timothy C., Li, Xinyi, Tian, Haijun, Zhang, Peng
We use 3653 (2661 RRab, 992 RRc) RR Lyrae stars (RRLs) with 7D (3D position, 3D velocity, and metallicity) information selected from SDSS, LAMOST, and Gaia EDR3, and divide the sample into two Oosterhoff groups (Oo I and Oo II) according to their amp
Externí odkaz:
http://arxiv.org/abs/2309.02828
Based on a large spectroscopic sample of $\sim$ 4,300 RR Lyrae stars with metallicity, systemic radial velocity and distance measurements, we present a detailed analysis of the chemical and kinematic properties of the Galactic halo. Using this sample
Externí odkaz:
http://arxiv.org/abs/2209.07885
Autor:
Nie, Jundan, Tian, Hao, Li, Jing, Liu, Chao, Smith, Martin C., Tang, Baitian, Carballo-Bello, Julio A., Ma, Jun, Tian, Haijun, Wang, Jiaxin, Wu, Zhenyu, Peng, Xiyan, Wang, Jiali, Zhang, Tianmeng, Zhou, Xu, Zhou, Zhimin, Zou, Hu
Whiting 1 is a faint and young globular cluster in the halo of the Milky Way, and was suggested to have originated in the Sagittarius spherical dwarf galaxy (Sgr dSph). In this paper, we use the deep DESI Legacy Imaging Surveys to explore tentative s
Externí odkaz:
http://arxiv.org/abs/2204.11064
Publikováno v:
In Applied Materials Today October 2024 40
Publikováno v:
In Optics and Lasers in Engineering September 2024 180
Publikováno v:
In Optics Communications 1 February 2024 552
M dwarf stars are the most common stars in the Galaxy, dominating the population of the Galaxy by numbers at faint magnitudes. Precise and accurate stellar parameters for M dwarfs are of crucial importance for many studies. However, the atmospheric p
Externí odkaz:
http://arxiv.org/abs/2012.14080
Autor:
Wu, Fengquan, Li, Jixia, Zuo, Shifan, Chen, Xuelei, Das, Santanu, Marriner, John P., Oxholm, Trevor M., Phan, Anh, Stebbins, Albert, Timbie, Peter T., Ansari, Reza, Campagne, Jean-Eric, Chen, Zhiping, Cong, Yanping, Huang, Qizhi, Li, Yichao, Liu, Tao, Liu, Yingfeng, Niu, Chenhui, Osinga, Calvin, Perdereau, Olivier, Peterson, Jeffrey B., Shi, Huli, Siebert, Gage, Sun, Shijie, Tian, Haijun, Tucker, Gregory S., Wang, Qunxiong, Wang, Rongli, Wang, Yougang, Wu, Yanlin, Xu, Yidong, Yu, Kaifeng, Yu, Zijie, Zhang, Jiao, Zhang, Juyong, Zhu, Jialu
The Tianlai Dish Pathfinder Array is a radio interferometer designed to test techniques for 21~cm intensity mapping in the post-reionization universe as a means for measuring large-scale cosmic structure. It performs drift scans of the sky at constan
Externí odkaz:
http://arxiv.org/abs/2011.05946