Zobrazeno 1 - 10
of 380
pro vyhledávání: '"Bird, Sarah A"'
Autor:
Yang, Xiang-Ming, Bird, Sarah A., Li, Jiadong, Tian, Hai-Jun, Qiu, Dan, Li, Jia-Peng, Li, Cheng-Yuan, Liu, Gao-Chao, Zhang, Peng, Zhang, Ju-Yong, Chen, Zhi-Ping
We present a comprehensive investigation on the mass function (MF) of a snake-like stellar structure in the solar neighbourhood, building on our previous discovery. To ensure the reliability of the data, we reselect the member stars of the Stellar ``
Externí odkaz:
http://arxiv.org/abs/2402.04130
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
Autor:
Jones, Amy M., Beaton, Rachael L., Cherinka, Brian A., Masters, Karen L., Lucatello, Sara, Diamond-Stanic, Aleksandar M., Bird, Sarah A., Blanton, Michael R., Cunha, Katia, Farr, Emily E., Feuillet, Diane, Frinchaboy, Peter M., Hagen, Alex, Kinemuchi, Karen, Lundgren, Britt, Marinelli, Mariarosa L., Myers, Adam D., Roman-Lopes, Alexandre, Ross, Ashley J., Sanchez-Gallego, Jose R., Schmidt, Sarah J., Sobeck, Jennifer, Stassun, Keivan G., Tayar, Jamie, Vargas-Magana, Mariana, Wilson, J. C., Zasowski, Gail
The Sloan Digital Sky Survey (SDSS) is one of the largest international astronomy organizations. We present demographic data based on surveys of its members from 2014, 2015 and 2016, during the fourth phase of SDSS (SDSS-IV). We find about half of SD
Externí odkaz:
http://arxiv.org/abs/2311.08970
Autor:
Magooda, Ahmed, Helyar, Alec, Jackson, Kyle, Sullivan, David, Atalla, Chad, Sheng, Emily, Vann, Dan, Edgar, Richard, Palangi, Hamid, Lutz, Roman, Kong, Hongliang, Yun, Vincent, Kamal, Eslam, Zarfati, Federico, Wallach, Hanna, Bird, Sarah, Chen, Mei
We present a framework for the automated measurement of responsible AI (RAI) metrics for large language models (LLMs) and associated products and services. Our framework for automatically measuring harms from LLMs builds on existing technical and soc
Externí odkaz:
http://arxiv.org/abs/2310.17750
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
We use the conjugate angle of radial action ($\theta_R$), the best representation of the orbital phase, to explore the "mid-plane, north branch, south branch" and "Monoceros area" disk structures that were previously revealed in the LAMOST K giants (
Externí odkaz:
http://arxiv.org/abs/2308.08092
Autor:
Sun, Tiancheng, Ge, Zhishuai, Chen, Xunzhou, Bi, Shaolan, Li, Tanda, Zhang, Xianfei, Li, Yaguang, Wu, Yaqian, Bird, Sarah A., W., Ferguson J., Zhou, Jianzhao, Ye, Lifei, Long, Liu, Zhang, Jinghua
Varying oxygen abundance could impact the modeling-inferred ages. This work aims to estimate the ages of dwarfs considering observed oxygen abundance. To characterize 67,503 LAMOST and 4,006 GALAH FGK-type dwarf stars, we construct a grid of stellar
Externí odkaz:
http://arxiv.org/abs/2307.04086
Autor:
Chen, Yu-Tao, Tian, Hai-Jun, Fang, Min, Zuo, Xiao-Xiong, Bird, Sarah A., Liu, Di, Zhu, Xin-Yu, Zhang, Peng, Liu, Gao-Chao, Cui, Sheng
GW~Ori is a young hierarchical triple system located in $\lambda$ Orionis, consisting of a binary (GW~Ori\,A and B), a tertiary star (GW~Ori\,C) and a rare circumtriple disk. Due to the limited data with poor accuracy, several short-period signals we
Externí odkaz:
http://arxiv.org/abs/2305.16287
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:
Bird, Sarah A., Xue, Xiang-Xiang, Liu, Chao, Flynn, Chris, Shen, Juntai, Wang, Jie, Yang, Chengqun, Zhai, Meng, Zhu, Ling, Zhao, Gang, Tian, Hai-Jun
We measure the enclosed Milky Way mass profile to Galactocentric distances of $\sim70$ and $\sim50$ kpc using the smooth, diffuse stellar halo samples of Bird et al. The samples are LAMOST and SDSS/SEGUE K giants (KG) and SDSS/SEGUE blue horizontal b
Externí odkaz:
http://arxiv.org/abs/2207.08839